[372] | 1 | #include "VssRay.h"
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| 2 | #include "AxisAlignedBox3.h"
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| 3 |
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| 4 | // Static variables
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| 5 | int
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| 6 | VssRay::mailID = 0;
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| 7 |
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| 8 |
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| 9 | bool
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| 10 | VssRay::ComputeMinMaxT(const AxisAlignedBox3 &box,
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[438] | 11 | float &tmin,
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| 12 | float &tmax) const
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[372] | 13 | {
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| 14 |
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| 15 | float minx, maxx, miny, maxy, minz, maxz;
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| 16 | Vector3 dir = GetDir();
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| 17 |
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| 18 | if (fabs(dir.x) < 0.001) {
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| 19 | if (box.Min().x < GetOrigin().x && box.Max().x > GetOrigin().x) {
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| 20 | minx = -MAXFLOAT;
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| 21 | maxx = MAXFLOAT;
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| 22 | }
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| 23 | else
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| 24 | return false;
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| 25 | }
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| 26 | else {
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| 27 | float t1 = (box.Min().x - GetOrigin().x) / dir.x;
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| 28 | float t2 = (box.Max().x - GetOrigin().x) / dir.x;
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| 29 | if (t1 < t2) {
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| 30 | minx = t1;
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| 31 | maxx = t2;
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| 32 | }
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| 33 | else {
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| 34 | minx = t2;
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| 35 | maxx = t1;
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| 36 | }
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| 37 | if (maxx < 0)
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| 38 | return false;
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| 39 | }
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| 40 |
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| 41 | if (fabs(dir.y) < 0.001) {
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| 42 | if (box.Min().y < GetOrigin().y && box.Max().y > GetOrigin().y) {
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| 43 | miny = -MAXFLOAT;
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| 44 | maxy = MAXFLOAT;
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| 45 | }
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| 46 | else
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| 47 | return false;
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| 48 | }
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| 49 | else {
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| 50 | float t1 = (box.Min().y - GetOrigin().y) / dir.y;
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| 51 | float t2 = (box.Max().y - GetOrigin().y) / dir.y;
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| 52 | if (t1 < t2) {
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| 53 | miny = t1;
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| 54 | maxy = t2;
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| 55 | }
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| 56 | else {
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| 57 | miny = t2;
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| 58 | maxy = t1;
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| 59 | }
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| 60 | if (maxy < 0.0)
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| 61 | return false;
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| 62 | }
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| 63 |
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| 64 | if (fabs(dir.z) < 0.001) {
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| 65 | if (box.Min().z < GetOrigin().z && box.Max().z > GetOrigin().z) {
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| 66 | minz = -MAXFLOAT;
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| 67 | maxz = MAXFLOAT;
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| 68 | }
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| 69 | else
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| 70 | return false;
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| 71 | }
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| 72 | else {
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| 73 | float t1 = (box.Min().z - GetOrigin().z) / dir.z;
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| 74 | float t2 = (box.Max().z - GetOrigin().z) / dir.z;
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| 75 | if (t1 < t2) {
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| 76 | minz = t1;
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| 77 | maxz = t2;
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| 78 | }
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| 79 | else {
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| 80 | minz = t2;
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| 81 | maxz = t1;
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| 82 | }
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| 83 | if (maxz < 0.0)
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| 84 | return false;
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| 85 | }
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| 86 |
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| 87 | tmin = minx;
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| 88 | if (miny > tmin)
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| 89 | tmin = miny;
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| 90 | if (minz > tmin)
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| 91 | tmin = minz;
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| 92 |
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| 93 | tmax = maxx;
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| 94 | if (maxy < tmax)
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| 95 | tmax = maxy;
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| 96 | if (maxz < tmax)
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| 97 | tmax = maxz;
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| 98 |
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| 99 | return 1; // yes, intersection was found
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| 100 | }
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| 101 |
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| 102 |
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| 103 |
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| 104 | bool
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| 105 | VssRay::Intersects(const AxisAlignedBox3 &box,
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| 106 | float &tmin,
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| 107 | float &tmax) const
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| 108 | {
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| 109 | if (!ComputeMinMaxT(box, tmin, tmax))
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| 110 | return false;
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| 111 |
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| 112 | if ( tmax < tmin)
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| 113 | return false; // the ray passes outside the box
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| 114 |
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| 115 | if ( tmax < 0.0f)
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| 116 | return false; // the intersection is not on the positive halfline
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| 117 |
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| 118 | return true; // ray hits the box .. origin can be outside or inside the box
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| 119 | }
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| 120 |
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| 121 |
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| 122 | bool
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| 123 | VssRay::IntersectsSphere(const Vector3 ¢er,
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| 124 | const float sqrRadius,
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| 125 | Vector3 &point,
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| 126 | float &t) const
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| 127 | {
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| 128 | // compute ray/plane intersection
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| 129 | Vector3 dir = GetDir();
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| 130 |
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| 131 | t = -DotProd(GetOrigin() - center, dir)*sqr(GetInvSize());
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| 132 |
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| 133 | if (t < 0.0f)
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| 134 | t = 0.0f;
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| 135 | else
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| 136 | if (t > 1.0f)
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| 137 | t = 1.0f;
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| 138 |
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| 139 | point = GetOrigin() + t*dir;
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| 140 |
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| 141 | return SqrDistance(point, center) < sqrRadius;
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| 142 | }
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[382] | 143 |
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| 144 |
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| 145 | float
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[438] | 146 | VssRay::GetDirParam(const int axis, const Vector3 dir)
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| 147 | {
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| 148 | return (axis == 0) ? atan2(dir.x, dir.z) : asin(dir.y);
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| 149 | }
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| 150 |
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| 151 | float
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[382] | 152 | VssRay::GetDirParametrization(const int axis) const
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| 153 | {
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[438] | 154 | Vector3 dir = GetNormalizedDir();
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| 155 | return GetDirParam(axis, dir);
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[382] | 156 | }
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[446] | 157 |
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| 158 |
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| 159 | void
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| 160 | GenerateExtendedConvexCombinationWeights(float &w1,
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| 161 | float &w2,
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| 162 | float &w3,
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| 163 | const float overlap
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| 164 | )
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| 165 | {
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| 166 | w1 = RandomValue(-overlap, 1.0f + overlap);
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| 167 | w2 = RandomValue(-overlap, 1.0f + overlap);
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| 168 | w3 = RandomValue(-overlap, 1.0f + overlap);
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| 169 |
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| 170 | float c = 1.0f/(w1 + w2 + w3);
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| 171 | w1 *= c;
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| 172 | w2 *= c;
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| 173 | w3 *= c;
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| 174 | }
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