[1520] | 1 | #include "RayCaster.h"
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| 2 | #include "VssRay.h"
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| 3 | #include "Ray.h"
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| 4 | #include "Preprocessor.h"
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[1942] | 5 | #include "ViewCellsManager.h"
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[1520] | 6 |
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[2629] | 7 | #include <cassert>
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[1520] | 8 |
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| 9 | namespace GtpVisibilityPreprocessor {
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| 10 |
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| 11 |
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| 12 | #define DEBUG_RAYCAST 0
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| 13 |
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[1942] | 14 | #define EXACT_BOX_CLIPPING 0
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[1520] | 15 |
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| 16 | RayCaster::RayCaster(const Preprocessor &preprocessor):
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[2583] | 17 | mVssRayPool(), mPreprocessor(preprocessor)
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[1520] | 18 | {
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| 19 | }
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| 20 |
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| 21 |
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[1521] | 22 | RayCaster::~RayCaster()
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| 23 | {
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| 24 | }
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| 25 |
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| 26 |
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[1545] | 27 | VssRay *RayCaster::CastRay(const SimpleRay &simpleRay,
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[1990] | 28 | const AxisAlignedBox3 &box,
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[1996] | 29 | const bool castDoubleRay)
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[1521] | 30 | {
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[1932] | 31 | VssRayContainer rays;
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[1996] | 32 | CastRay(simpleRay, rays, box, castDoubleRay, true);
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[1932] | 33 |
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| 34 | if (!rays.empty())
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| 35 | return rays.back();
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| 36 | else
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| 37 | return NULL;
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[1521] | 38 | }
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| 39 |
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[1990] | 40 |
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[1942] | 41 | bool
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| 42 | RayCaster::ClipToViewSpaceBox(const Vector3 &origin,
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| 43 | const Vector3 &termination,
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| 44 | Vector3 &clippedOrigin,
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| 45 | Vector3 &clippedTermination)
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| 46 | {
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[1952] | 47 |
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[1942] | 48 | Ray ray(origin, termination - origin, Ray::LINE_SEGMENT);
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| 49 | ray.Precompute();
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| 50 |
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| 51 | float tmin, tmax;
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| 52 | if ((!mPreprocessor.mViewCellsManager->
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| 53 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax)) ||
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| 54 | tmin>=tmax
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| 55 | )
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| 56 | return false;
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[1521] | 57 |
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[2070] | 58 | if (tmin >= 1.0f || tmax <= 0.0f)
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[1942] | 59 | return false;
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| 60 |
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| 61 | if (tmin > 0.0f)
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| 62 | clippedOrigin = ray.Extrap(tmin);
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| 63 | else
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| 64 | clippedOrigin = origin;
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| 65 |
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| 66 | if (tmax < 1.0f)
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| 67 | clippedTermination = ray.Extrap(tmax);
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| 68 | else
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| 69 | clippedTermination = termination;
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| 70 |
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| 71 | return true;
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| 72 | }
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| 73 |
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[2070] | 74 | /** Checks if ray is valid
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| 75 | (e.g., not in empty view space or outside the view space)
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[1528] | 76 | */
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[1867] | 77 | bool
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| 78 | RayCaster::ValidateRay(const Vector3 &origin,
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| 79 | const Vector3 &direction,
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| 80 | const AxisAlignedBox3 &box,
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| 81 | Intersection &hit)
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[1528] | 82 | {
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[1932] | 83 | if (!hit.mObject)
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| 84 | {
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| 85 | // compute intersection with the scene bounding box
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[1584] | 86 | #if EXACT_BOX_CLIPPING
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[1932] | 87 | static Ray ray;
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| 88 | mPreprocessor.SetupRay(ray, origin, direction);
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| 89 |
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| 90 | float tmin, tmax;
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| 91 | if (box.ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
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| 92 | {
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| 93 | hit.mPoint = ray.Extrap(tmax);
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| 94 | }
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| 95 | else
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| 96 | {
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| 97 | // cout<<" invalid hp "<<tmin<<" "<<tmax<<endl;
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| 98 | // cout<<" box "<<box<<endl;
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| 99 | // cout<<" origin "<<origin<<endl;
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| 100 | // cout<<" direction "<<direction<<endl;
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| 101 | // cout<< "inv dir"<<ray.GetInvDir()<<endl;
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| 102 | return false;
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| 103 | }
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[1584] | 104 | #else
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[1932] | 105 | hit.mPoint = origin + direction * Magnitude(box.Diagonal());
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[1584] | 106 | #endif
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| 107 | }
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[1932] | 108 | else
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| 109 | {
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[2035] | 110 | if (mPreprocessor.mDetectEmptyViewSpace) {
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| 111 | if (DotProd(hit.mNormal, direction) >= -Limits::Small) {
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| 112 | hit.mObject = NULL;
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| 113 | return false;
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[1932] | 114 | }
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[2035] | 115 | }
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[1932] | 116 | }
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[2035] | 117 |
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[1932] | 118 | return true;
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[1528] | 119 | }
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| 120 |
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[1974] | 121 | void
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| 122 | RayCaster::SortRays(SimpleRayContainer &rays)
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| 123 | {
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[1984] | 124 | AxisAlignedBox3 box =
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| 125 | mPreprocessor.mViewCellsManager->GetViewSpaceBox();
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[2105] | 126 |
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[1984] | 127 | float b[12]={
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| 128 | box.Min().x,
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| 129 | box.Min().y,
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| 130 | box.Min().z,
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| 131 | -1,
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| 132 | -1,
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| 133 | -1,
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| 134 | box.Max().x,
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| 135 | box.Max().y,
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| 136 | box.Max().z,
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| 137 | 1,
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| 138 | 1,
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| 139 | 1
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| 140 | };
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| 141 |
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[2105] | 142 | #if 0
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| 143 | static vector<SimpleRay *> pointerArray;
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| 144 |
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| 145 | if (pointerArray.size()!=rays.size()) {
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| 146 | // realloc the pointerarray
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| 147 | pointerArray.resize(rays.size());
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| 148 | }
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| 149 |
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| 150 | // init pointer array
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| 151 | SimpleRay *p = &pointerArray[0];
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| 152 | for (i=0; i < rays.size(); i++, p++)
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| 153 | pointerArray[i] = p;
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| 154 | #endif
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| 155 |
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[1984] | 156 | _SortRays(rays,
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| 157 | 0,
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[1990] | 158 | (int)rays.size()-1,
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[1984] | 159 | 0,
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| 160 | b
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| 161 | );
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[1974] | 162 | }
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| 163 |
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| 164 | void
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| 165 | RayCaster::_SortRays(SimpleRayContainer &rays,
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| 166 | const int l,
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| 167 | const int r,
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[1984] | 168 | const int depth,
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| 169 | float box[12])
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[1974] | 170 | {
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| 171 | // pick-up a pivot
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[1984] | 172 | int axis;
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| 173 |
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| 174 | float maxDiff = -1.0f;
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| 175 | // get the largest axis
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| 176 | int offset = 0;
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[1990] | 177 | int i;
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[1984] | 178 |
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[2105] | 179 | //const int batchsize = 16384;
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[2008] | 180 | const int batchsize = 8192;
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[2105] | 181 | //const int batchsize = 128;
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[2008] | 182 |
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[2105] | 183 | //if (r - l < 16*batchsize)
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| 184 | // offset = 3;
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[2008] | 185 |
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[2105] | 186 | // if (depth%2==0)
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[2008] | 187 | // offset = 3;
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[1984] | 188 |
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[2002] | 189 | for (i=offset; i < offset + 3; i++) {
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| 190 | float diff = box[i + 6] - box[i];
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[1984] | 191 | if (diff > maxDiff) {
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| 192 | maxDiff = diff;
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| 193 | axis = i;
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| 194 | }
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| 195 | }
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| 196 |
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[2008] | 197 | // cout<<depth<<" "<<axis<<" "<<l<<" "<<r<<endl;
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[1984] | 198 |
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[1990] | 199 | i=l;
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| 200 | int j=r;
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| 201 |
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[1984] | 202 | float x = (box[axis] + box[axis+6])*0.5f;
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| 203 | // float x = rays[(l+r)/2].GetParam(axis);
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[1974] | 204 | do {
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[2008] | 205 | while(i<j && rays[i].GetParam(axis) < x)
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[1974] | 206 | i++;
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[2008] | 207 | while(i<j && x < rays[j].GetParam(axis))
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[1974] | 208 | j--;
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| 209 |
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| 210 | if (i <= j) {
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| 211 | swap(rays[i], rays[j]);
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| 212 | i++;
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| 213 | j--;
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| 214 | }
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| 215 | } while (i<=j);
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[2008] | 216 |
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[1974] | 217 |
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[2008] | 218 | if (l + batchsize < j ) {
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[1984] | 219 | // set new max
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| 220 | float save = box[axis+6];
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| 221 | box[axis+6] = x;
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| 222 | _SortRays(rays, l, j, depth+1, box);
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| 223 | box[axis+6] = save;
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[2008] | 224 | } else {
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| 225 | // for (int k=0; k < 6; k++)
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| 226 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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[1984] | 227 | }
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[1974] | 228 |
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[2008] | 229 | if (i + batchsize < r) {
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[1984] | 230 | // set new min
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| 231 | box[axis] = x;
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| 232 | _SortRays(rays, i, r, depth+1, box);
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[2008] | 233 | } else {
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| 234 | // for (int k=0; k < 6; k++)
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| 235 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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[1984] | 236 | }
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[2008] | 237 |
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[1974] | 238 | }
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| 239 |
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[2629] | 240 |
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| 241 | void
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| 242 | RayCaster::SortRays2(SimpleRayContainer &rays)
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| 243 | {
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| 244 | AxisAlignedBox3 box =
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| 245 | mPreprocessor.mViewCellsManager->GetViewSpaceBox();
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| 246 |
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| 247 | const float sizeBox = Magnitude(box.Diagonal());
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| 248 | // This is some size of the
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| 249 | const float sizeDir = 0.2f * sizeBox;
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| 250 |
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| 251 | float b[12]={
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| 252 | box.Min().x,
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| 253 | box.Min().y,
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| 254 | box.Min().z,
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| 255 | -sizeDir,
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| 256 | -sizeDir,
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| 257 | -sizeDir,
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| 258 | box.Max().x,
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| 259 | box.Max().y,
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| 260 | box.Max().z,
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| 261 | sizeDir,
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| 262 | sizeDir,
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| 263 | sizeDir
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| 264 | };
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| 265 |
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| 266 | #if 0
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| 267 | static vector<SimpleRay *> pointerArray;
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| 268 |
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| 269 | if (pointerArray.size()!=rays.size()) {
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| 270 | // realloc the pointerarray
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| 271 | pointerArray.resize(rays.size());
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| 272 | }
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| 273 |
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| 274 | // init pointer array
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| 275 | SimpleRay *p = &pointerArray[0];
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| 276 | for (i=0; i < rays.size(); i++, p++)
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| 277 | pointerArray[i] = p;
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| 278 | #endif
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| 279 |
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| 280 | _SortRays2(rays, 0, (int)rays.size()-1, 0, b);
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| 281 |
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| 282 | return;
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| 283 | }
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[1974] | 284 |
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[2629] | 285 | void
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| 286 | RayCaster::_SortRays2(SimpleRayContainer &rays,
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| 287 | const int l,
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| 288 | const int r,
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| 289 | const int depth,
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| 290 | float box[12])
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| 291 | {
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| 292 | // pick-up a pivot
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| 293 | int axis;
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| 294 |
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| 295 | float maxDiff = -1.0f;
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| 296 | // get the largest axis
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| 297 | int offset = 0;
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| 298 | int i;
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| 299 |
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| 300 | //const int batchsize = 16384;
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| 301 | //const int batchsize = 8192;
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| 302 | const int batchsize = 128;
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| 303 |
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| 304 | //if (r - l < 16*batchsize)
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| 305 | // offset = 3;
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| 306 |
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| 307 | // if (depth%2==0)
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| 308 | // offset = 3;
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| 309 |
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| 310 | for (i=offset; i < offset + 6; i++) {
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| 311 | float diff = box[i + 6] - box[i];
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| 312 | assert(diff >= 0.f);
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| 313 | if (diff > maxDiff) {
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| 314 | // Find the maximum
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| 315 | maxDiff = diff;
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| 316 | axis = i;
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| 317 | }
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| 318 | }
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| 319 |
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| 320 | // cout<<depth<<" "<<axis<<" "<<l<<" "<<r<<endl;
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| 321 |
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| 322 | i=l;
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| 323 | int j=r;
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| 324 |
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| 325 | float x = (box[axis] + box[axis+6])*0.5f;
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| 326 | // float x = rays[(l+r)/2].GetParam(axis);
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| 327 | do {
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| 328 | while(i<j && rays[i].GetParam(axis) < x)
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| 329 | i++;
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| 330 | while(i<j && x < rays[j].GetParam(axis))
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| 331 | j--;
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| 332 |
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| 333 | if (i <= j) {
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| 334 | swap(rays[i], rays[j]);
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| 335 | i++;
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| 336 | j--;
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| 337 | }
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| 338 | } while (i<=j);
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| 339 |
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| 340 |
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| 341 | if (l + batchsize < j ) {
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| 342 | // set new max
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| 343 | float save = box[axis+6];
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| 344 | box[axis+6] = x;
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| 345 | _SortRays2(rays, l, j, depth+1, box);
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| 346 | box[axis+6] = save;
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| 347 | } else {
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| 348 | // for (int k=0; k < 6; k++)
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| 349 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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| 350 | }
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| 351 |
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| 352 | if (i + batchsize < r) {
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| 353 | // set new min
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| 354 | box[axis] = x;
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| 355 | _SortRays2(rays, i, r, depth+1, box);
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| 356 | } else {
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| 357 | // for (int k=0; k < 6; k++)
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| 358 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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| 359 | }
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| 360 |
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| 361 | }
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| 362 |
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| 363 |
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[2187] | 364 | VssRay *RayCaster::RequestRay(const Vector3 &origin,
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| 365 | const Vector3 &termination,
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| 366 | Intersectable *originObject,
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| 367 | Intersectable *terminationObject,
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| 368 | const int pass,
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| 369 | const float pdf)
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| 370 | {
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| 371 | #if DEBUG_RAYCAST
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| 372 | Debug<<"PR2a"<<flush;
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| 373 | #endif
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| 374 |
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| 375 | // old method: always allocate
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[2198] | 376 | if (0) return new VssRay(origin, termination, originObject, terminationObject, pass, pdf);
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[1528] | 377 |
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[2187] | 378 | VssRay *vssRay = mVssRayPool.Alloc();
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| 379 |
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| 380 | #if DEBUG_RAYCAST
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| 381 | Debug<<"PR2b"<<flush;
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| 382 | #endif
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| 383 |
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| 384 | *vssRay = VssRay(origin, termination, originObject, terminationObject, pass, pdf);
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| 385 |
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| 386 | #if DEBUG_RAYCAST
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| 387 | Debug<<"PR2c"<<flush;
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| 388 | #endif
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| 389 |
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| 390 | return vssRay;
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| 391 | }
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| 392 |
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| 393 |
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[1867] | 394 | int
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| 395 | RayCaster::ProcessRay(const SimpleRay &simpleRay,
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[2583] | 396 | Intersection &hitA,
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| 397 | Intersection &hitB,
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| 398 | VssRayContainer &vssRays,
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| 399 | const AxisAlignedBox3 &box,
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| 400 | const bool castDoubleRay,
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| 401 | const bool pruneInvalidRays)
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[1520] | 402 | {
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[1984] | 403 | int hits = 0;
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[1528] | 404 |
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[2014] | 405 |
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[1520] | 406 | #if DEBUG_RAYCAST
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[2013] | 407 | static int id=0;
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| 408 | Debug<<"PRA "<<id++<<endl<<flush;
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[1520] | 409 | #endif
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[1528] | 410 |
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[1932] | 411 | if (pruneInvalidRays)
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| 412 | {
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[1952] | 413 | if (!hitA.mObject && !hitB.mObject) {
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| 414 | return 0;
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| 415 | }
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[1520] | 416 | }
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[1584] | 417 |
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[2070] | 418 | // regardless of the pruneInvalidRays setting reject
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| 419 | // rays whic degenerate to a point
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[1966] | 420 | if (EpsilonEqualV3(hitA.mPoint, hitB.mPoint, Limits::Small)) {
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[2035] | 421 | return 0;
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[1966] | 422 | }
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| 423 |
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[1952] | 424 | const bool validA = ValidateRay(simpleRay.mOrigin, simpleRay.mDirection, box, hitA);
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[1932] | 425 | const bool validB = //castDoubleRay &&
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[1952] | 426 | ValidateRay(simpleRay.mOrigin, -simpleRay.mDirection, box, hitB);
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[1867] | 427 |
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[1952] | 428 |
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[1757] | 429 | #if DEBUG_RAYCAST
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| 430 | Debug<<"PR1"<<flush;
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| 431 | #endif
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[1584] | 432 |
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[1867] | 433 | // reset both contributions
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[1952] | 434 | if (!validA || !validB) {
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[2070] | 435 | if (0 || pruneInvalidRays)
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[1952] | 436 | return 0;
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[1867] | 437 |
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[1952] | 438 | // reset both contributions of this ray
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| 439 | hitA.mObject = NULL;
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| 440 | hitB.mObject = NULL;
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| 441 | }
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| 442 |
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[1867] | 443 | // 8.11. 2007 JB
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| 444 | // degenerate rays checked by geometrical constraint...
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| 445 | // !pruneInvalidRays || (hitA.mObject != hitB.mObject);
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[1942] | 446 |
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[1584] | 447 |
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[1757] | 448 | #if DEBUG_RAYCAST
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| 449 | Debug<<"PR2"<<flush;
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| 450 | #endif
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[2575] | 451 |
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| 452 | // VH - I do not know what this is for, commented out temporarily
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| 453 | // !!!!!!!!!!!!!! !!!!!!!!!!!! !!!!!!!!!!
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| 454 | #if 1
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[1942] | 455 | const bool validSample = true;
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| 456 | if (validSample) {
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| 457 | Vector3 clipA, clipB;
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| 458 | if (!ClipToViewSpaceBox(hitA.mPoint,
|
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| 459 | hitB.mPoint,
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| 460 | clipA,
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| 461 | clipB))
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| 462 | return 0;
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[1952] | 463 |
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[1942] | 464 | if (!pruneInvalidRays || hitA.mObject) {
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[2014] | 465 |
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[2187] | 466 | VssRay *vssRay =
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| 467 | RequestRay(!castDoubleRay ? simpleRay.mOrigin : clipB,
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[2012] | 468 | hitA.mPoint,
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| 469 | hitB.mObject,
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| 470 | hitA.mObject,
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| 471 | mPreprocessor.mPass,
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[2105] | 472 | 1.0f //simpleRay.mPdf
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[2012] | 473 | );
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[2187] | 474 |
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[1867] | 475 | if (validA)
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[2021] | 476 | vssRay->mFlags |= VssRay::Valid;
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| 477 |
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[1883] | 478 | vssRay->mDistribution = simpleRay.mDistribution;
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[1989] | 479 | vssRay->mGeneratorId = simpleRay.mGeneratorId;
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| 480 |
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[1867] | 481 | vssRays.push_back(vssRay);
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| 482 | ++ hits;
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| 483 | //cout << "vssray 1: " << *vssRay << " " << vssRay->mTermination - vssRay->mOrigin << endl;
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[1932] | 484 | }
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| 485 |
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[1867] | 486 | #if DEBUG_RAYCAST
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[1932] | 487 | Debug<<"PR3"<<flush;
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[1867] | 488 | #endif
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| 489 |
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[2070] | 490 | if (castDoubleRay && (!pruneInvalidRays || hitB.mObject))
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| 491 | {
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[2187] | 492 | VssRay *vssRay = RequestRay(
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[2575] | 493 | clipA,
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| 494 | hitB.mPoint,
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| 495 | hitA.mObject,
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| 496 | hitB.mObject,
|
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| 497 | mPreprocessor.mPass,
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| 498 | 1.0f //simpleRay.mPdf
|
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| 499 | );
|
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[2070] | 500 |
|
---|
| 501 | if (validB)
|
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[1771] | 502 | vssRay->mFlags |= VssRay::Valid;
|
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[1932] | 503 |
|
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| 504 | vssRay->mDistribution = simpleRay.mDistribution;
|
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[1989] | 505 | vssRay->mGeneratorId = simpleRay.mGeneratorId;
|
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[1932] | 506 | vssRays.push_back(vssRay);
|
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| 507 | ++ hits;
|
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| 508 | //cout << "vssray 2: " << *vssRay << endl;
|
---|
[2070] | 509 | }
|
---|
[1942] | 510 | #if DEBUG_RAYCAST
|
---|
| 511 | Debug<<"PR4"<<flush;
|
---|
| 512 | #endif
|
---|
[2575] | 513 | } // validSample
|
---|
| 514 | #else
|
---|
| 515 | // Just pass if intersected or not
|
---|
| 516 | hits = (hitA.mObject != 0) ? 1 : 0;
|
---|
| 517 | intersect = hitA;
|
---|
| 518 | #endif
|
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[1867] | 519 |
|
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[1520] | 520 | return hits;
|
---|
| 521 | }
|
---|
| 522 |
|
---|
[2076] | 523 |
|
---|
| 524 | void
|
---|
| 525 | RayCaster::CastRays(
|
---|
[2575] | 526 | SimpleRayContainer &rays,
|
---|
| 527 | VssRayContainer &vssRays,
|
---|
| 528 | const AxisAlignedBox3 &sbox,
|
---|
| 529 | const bool castDoubleRay,
|
---|
| 530 | const bool pruneInvalidRays )
|
---|
[2076] | 531 | {
|
---|
[2575] | 532 | SimpleRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
| 533 |
|
---|
| 534 | for (rit = rays.begin(); rit != rit_end; ++ rit) {
|
---|
| 535 |
|
---|
| 536 | CastRay(
|
---|
| 537 | *rit,
|
---|
| 538 | vssRays,
|
---|
| 539 | sbox,
|
---|
| 540 | castDoubleRay,
|
---|
| 541 | pruneInvalidRays);
|
---|
[2187] | 542 | }
|
---|
[1583] | 543 | }
|
---|
[2575] | 544 |
|
---|
[2076] | 545 |
|
---|
| 546 | }
|
---|