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OgreFrustum.cpp @ 193

Revision 193, 32.1 KB checked in by mattausch, 19 years ago (diff)
changed to ogre 103 added readme

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1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://ogre.sourceforge.net/
6
7	Copyright (c) 2000-2005 The OGRE Team
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23	-----------------------------------------------------------------------------
24	*/
25	#include "OgreStableHeaders.h"
26	#include "OgreFrustum.h"
27
28	#include "OgreMath.h"
29	#include "OgreMatrix3.h"
30	#include "OgreSceneNode.h"
31	#include "OgreSphere.h"
32	#include "OgreLogManager.h"
33	#include "OgreException.h"
34	#include "OgreRoot.h"
35	#include "OgreCamera.h"
36	#include "OgreHardwareBufferManager.h"
37	#include "OgreHardwareVertexBuffer.h"
38	#include "OgreHardwareIndexBuffer.h"
39	#include "OgreMaterialManager.h"
40	#include "OgreRenderSystem.h"
41
42	namespace Ogre {
43
44	String Frustum::msMovableType = "Frustum";
45	const Real Frustum::INFINITE_FAR_PLANE_ADJUST = 0.00001;
46	//-----------------------------------------------------------------------
47	Frustum::Frustum() :
48	mProjType(PT_PERSPECTIVE),
49	mFOVy(Radian(Math::PI/4.0)),
50	mFarDist(100000.0f),
51	mNearDist(100.0f),
52	mAspect(1.33333333333333f),
53	mProjMatrix(Matrix4::ZERO),
54	mViewMatrix(Matrix4::ZERO),
55	mRecalcFrustum(true),
56	mRecalcView(true),
57	mReflect(false),
58	mReflectMatrix(Matrix4::ZERO),
59	mLinkedReflectPlane(0),
60	mObliqueDepthProjection(false),
61	mLinkedObliqueProjPlane(0)
62	{
63	// Initialise vertex & index data
64	mVertexData.vertexDeclaration->addElement(0, 0, VET_FLOAT3, VES_POSITION);
65	mVertexData.vertexCount = 32;
66	mVertexData.vertexStart = 0;
67	mVertexData.vertexBufferBinding->setBinding( 0,
68	HardwareBufferManager::getSingleton().createVertexBuffer(
69	sizeof(float)*3, 32, HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY) );
70
71	// Initialise material
72	mMaterial = MaterialManager::getSingleton().getByName("BaseWhiteNoLighting");
73
74	// Alter superclass members
75	mVisible = false;
76	mParentNode = 0;
77
78	mLastLinkedReflectionPlane.normal = Vector3::ZERO;
79	mLastLinkedObliqueProjPlane.normal = Vector3::ZERO;
80
81
82	updateView();
83	}
84
85	//-----------------------------------------------------------------------
86	Frustum::~Frustum()
87	{
88	// Do nothing
89	}
90
91	//-----------------------------------------------------------------------
92	void Frustum::setFOVy(const Radian& fov)
93	{
94	mFOVy = fov;
95	invalidateFrustum();
96	}
97
98	//-----------------------------------------------------------------------
99	const Radian& Frustum::getFOVy(void) const
100	{
101	return mFOVy;
102	}
103
104
105	//-----------------------------------------------------------------------
106	void Frustum::setFarClipDistance(Real farPlane)
107	{
108	mFarDist = farPlane;
109	invalidateFrustum();
110	}
111
112	//-----------------------------------------------------------------------
113	Real Frustum::getFarClipDistance(void) const
114	{
115	return mFarDist;
116	}
117
118	//-----------------------------------------------------------------------
119	void Frustum::setNearClipDistance(Real nearPlane)
120	{
121	if (nearPlane <= 0)
122	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Near clip distance must be greater than zero.",
123	"Frustum::setNearClipDistance");
124	mNearDist = nearPlane;
125	invalidateFrustum();
126	}
127
128	//-----------------------------------------------------------------------
129	Real Frustum::getNearClipDistance(void) const
130	{
131	return mNearDist;
132	}
133
134	//-----------------------------------------------------------------------
135	const Matrix4& Frustum::getProjectionMatrix(void) const
136	{
137
138	updateFrustum();
139
140	return mProjMatrix;
141	}
142	//-----------------------------------------------------------------------
143	const Matrix4& Frustum::getStandardProjectionMatrix(void) const
144	{
145
146	updateFrustum();
147
148	return mStandardProjMatrix;
149	}
150	//-----------------------------------------------------------------------
151	const Matrix4& Frustum::getViewMatrix(void) const
152	{
153	updateView();
154
155	return mViewMatrix;
156
157	}
158
159	//-----------------------------------------------------------------------
160	const Plane& Frustum::getFrustumPlane(unsigned short plane) const
161	{
162	// Make any pending updates to the calculated frustum
163	updateView();
164
165	return mFrustumPlanes[plane];
166
167	}
168
169	//-----------------------------------------------------------------------
170	bool Frustum::isVisible(const AxisAlignedBox& bound, FrustumPlane* culledBy) const
171	{
172	// Null boxes always invisible
173	if (bound.isNull()) return false;
174
175	// Make any pending updates to the calculated frustum
176	updateView();
177
178	// Get corners of the box
179	const Vector3* pCorners = bound.getAllCorners();
180
181
182	// For each plane, see if all points are on the negative side
183	// If so, object is not visible
184	for (int plane = 0; plane < 6; ++plane)
185	{
186	// Skip far plane if infinite view frustum
187	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
188	continue;
189
190	if (mFrustumPlanes[plane].getSide(pCorners[0]) == Plane::NEGATIVE_SIDE &&
191	mFrustumPlanes[plane].getSide(pCorners[1]) == Plane::NEGATIVE_SIDE &&
192	mFrustumPlanes[plane].getSide(pCorners[2]) == Plane::NEGATIVE_SIDE &&
193	mFrustumPlanes[plane].getSide(pCorners[3]) == Plane::NEGATIVE_SIDE &&
194	mFrustumPlanes[plane].getSide(pCorners[4]) == Plane::NEGATIVE_SIDE &&
195	mFrustumPlanes[plane].getSide(pCorners[5]) == Plane::NEGATIVE_SIDE &&
196	mFrustumPlanes[plane].getSide(pCorners[6]) == Plane::NEGATIVE_SIDE &&
197	mFrustumPlanes[plane].getSide(pCorners[7]) == Plane::NEGATIVE_SIDE)
198	{
199	// ALL corners on negative side therefore out of view
200	if (culledBy)
201	*culledBy = (FrustumPlane)plane;
202	return false;
203	}
204
205	}
206
207	return true;
208	}
209
210	//-----------------------------------------------------------------------
211	bool Frustum::isVisible(const Vector3& vert, FrustumPlane* culledBy) const
212	{
213	// Make any pending updates to the calculated frustum
214	updateView();
215
216	// For each plane, see if all points are on the negative side
217	// If so, object is not visible
218	for (int plane = 0; plane < 6; ++plane)
219	{
220	// Skip far plane if infinite view frustum
221	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
222	continue;
223
224	if (mFrustumPlanes[plane].getSide(vert) == Plane::NEGATIVE_SIDE)
225	{
226	// ALL corners on negative side therefore out of view
227	if (culledBy)
228	*culledBy = (FrustumPlane)plane;
229	return false;
230	}
231
232	}
233
234	return true;
235	}
236
237	//-----------------------------------------------------------------------
238	bool Frustum::isVisible(const Sphere& sphere, FrustumPlane* culledBy) const
239	{
240	// Make any pending updates to the calculated frustum
241	updateView();
242
243	// For each plane, see if sphere is on negative side
244	// If so, object is not visible
245	for (int plane = 0; plane < 6; ++plane)
246	{
247	// Skip far plane if infinite view frustum
248	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
249	continue;
250
251	// If the distance from sphere center to plane is negative, and 'more negative'
252	// than the radius of the sphere, sphere is outside frustum
253	if (mFrustumPlanes[plane].getDistance(sphere.getCenter()) < -sphere.getRadius())
254	{
255	// ALL corners on negative side therefore out of view
256	if (culledBy)
257	*culledBy = (FrustumPlane)plane;
258	return false;
259	}
260
261	}
262
263	return true;
264	}
265	//-----------------------------------------------------------------------
266	void Frustum::updateFrustum(void) const
267	{
268	if (isFrustumOutOfDate())
269	{
270	// Common calcs
271	Radian thetaY (mFOVy * 0.5f);
272	Real tanThetaY = Math::Tan(thetaY);
273	Real tanThetaX = tanThetaY * mAspect;
274	Real vpTop = tanThetaY * mNearDist;
275	Real vpRight = tanThetaX * mNearDist;
276	Real vpBottom = -vpTop;
277	Real vpLeft = -vpRight;
278
279	RenderSystem* renderSystem = Root::getSingleton().getRenderSystem();
280	// Recalc if frustum params changed
281	if (mProjType == PT_PERSPECTIVE)
282	{
283
284	// PERSPECTIVE transform, API specific
285	renderSystem->_makeProjectionMatrix(mFOVy,
286	mAspect, mNearDist, mFarDist, mProjMatrix);
287
288	// PERSPECTIVE transform, API specific for Gpu Programs
289	renderSystem->_makeProjectionMatrix(mFOVy,
290	mAspect, mNearDist, mFarDist, mStandardProjMatrix, true);
291
292	if (mObliqueDepthProjection)
293	{
294	// Translate the plane into view space
295	Plane viewSpaceNear = mViewMatrix * mObliqueProjPlane;
296	renderSystem->_applyObliqueDepthProjection(
297	mProjMatrix, viewSpaceNear, false);
298	renderSystem->_applyObliqueDepthProjection(
299	mStandardProjMatrix, viewSpaceNear, true);
300	}
301	}
302	else if (mProjType == PT_ORTHOGRAPHIC)
303	{
304	// ORTHOGRAPHIC projection, API specific
305	Root::getSingleton().getRenderSystem()->_makeOrthoMatrix(mFOVy,
306	mAspect, mNearDist, mFarDist, mProjMatrix);
307
308	// ORTHOGRAPHIC projection, non-API specific
309	Root::getSingleton().getRenderSystem()->_makeOrthoMatrix(mFOVy,
310	mAspect, mNearDist, mFarDist, mStandardProjMatrix, true);
311
312
313	}
314
315
316	// Calculate bounding box (local)
317	// Box is from 0, down -Z, max dimensions as determined from far plane
318	// If infinite view frustum just pick a far value
319	Real farDist = (mFarDist == 0) ? 100000 : mFarDist;
320	Real farTop = tanThetaY * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
321	Real farRight = tanThetaX * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
322	Real farBottom = -farTop;
323	Real farLeft = -farRight;
324	Vector3 min(-farRight, -farTop, 0);
325	Vector3 max(farRight, farTop, -farDist);
326	mBoundingBox.setExtents(min, max);
327
328	// Calculate vertex positions (local)
329	// 0 is the origin
330	// 1, 2, 3, 4 are the points on the near plane, top left first, clockwise
331	// 5, 6, 7, 8 are the points on the far plane, top left first, clockwise
332	HardwareVertexBufferSharedPtr vbuf = mVertexData.vertexBufferBinding->getBuffer(0);
333	float* pFloat = static_cast<float*>(vbuf->lock(HardwareBuffer::HBL_DISCARD));
334
335	// near plane (remember frustum is going in -Z direction)
336	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
337	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
338
339	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
340	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
341
342	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
343	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
344
345	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
346	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
347
348	// far plane (remember frustum is going in -Z direction)
349	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
350	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
351
352	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
353	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
354
355	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
356	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
357
358	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
359	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
360
361	// Sides of the pyramid
362	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
363	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
364
365	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
366	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
367
368	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
369	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
370
371	pFloat++ = 0.0f; pFloat++ = 0.0f; *pFloat++ = 0.0f;
372	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
373
374	// Sides of the box
375
376	pFloat++ = vpLeft; pFloat++ = vpTop; *pFloat++ = -mNearDist;
377	pFloat++ = farLeft; pFloat++ = farTop; *pFloat++ = -farDist;
378
379	pFloat++ = vpRight; pFloat++ = vpTop; *pFloat++ = -mNearDist;
380	pFloat++ = farRight; pFloat++ = farTop; *pFloat++ = -farDist;
381
382	pFloat++ = vpRight; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
383	pFloat++ = farRight; pFloat++ = farBottom; *pFloat++ = -farDist;
384
385	pFloat++ = vpLeft; pFloat++ = vpBottom; *pFloat++ = -mNearDist;
386	pFloat++ = farLeft; pFloat++ = farBottom; *pFloat++ = -farDist;
387
388
389	vbuf->unlock();
390
391	mRecalcFrustum = false;
392	}
393	}
394
395	//-----------------------------------------------------------------------
396	bool Frustum::isViewOutOfDate(void) const
397	{
398	bool returnVal = false;
399	// Attached to node?
400	if (mParentNode)
401	{
402	if (!mRecalcView && mParentNode->_getDerivedOrientation() == mLastParentOrientation &&
403	mParentNode->_getDerivedPosition() == mLastParentPosition)
404	{
405	returnVal = false;
406	}
407	else
408	{
409	// Ok, we're out of date with SceneNode we're attached to
410	mLastParentOrientation = mParentNode->_getDerivedOrientation();
411	mLastParentPosition = mParentNode->_getDerivedPosition();
412	returnVal = true;
413	}
414	}
415	// Deriving reflection from linked plane?
416	if (mReflect && mLinkedReflectPlane &&
417	!(mLastLinkedReflectionPlane == mLinkedReflectPlane->_getDerivedPlane()))
418	{
419	mReflectPlane = mLinkedReflectPlane->_getDerivedPlane();
420	mReflectMatrix = Math::buildReflectionMatrix(mReflectPlane);
421	mLastLinkedReflectionPlane = mLinkedReflectPlane->_getDerivedPlane();
422	returnVal = true;
423	}
424
425	return mRecalcView \|\| returnVal;
426	}
427
428	//-----------------------------------------------------------------------
429	bool Frustum::isFrustumOutOfDate(void) const
430	{
431	// Deriving custom near plane from linked plane?
432	bool returnVal = false;
433	if (mObliqueDepthProjection)
434	{
435	// Always out of date since plane needs to be in view space
436	returnVal = true;
437	// Update derived plane
438	if (mLinkedObliqueProjPlane &&
439	!(mLastLinkedObliqueProjPlane == mLinkedObliqueProjPlane->_getDerivedPlane()))
440	{
441	mObliqueProjPlane = mLinkedObliqueProjPlane->_getDerivedPlane();
442	mLastLinkedObliqueProjPlane = mObliqueProjPlane;
443	}
444	}
445
446	return mRecalcFrustum \|\| returnVal;
447	}
448
449	//-----------------------------------------------------------------------
450	void Frustum::updateView(void) const
451	{
452	if (isViewOutOfDate())
453	{
454	// ----------------------
455	// Update the view matrix
456	// ----------------------
457
458	// View matrix is:
459	//
460	// [ Lx Uy Dz Tx ]
461	// [ Lx Uy Dz Ty ]
462	// [ Lx Uy Dz Tz ]
463	// [ 0 0 0 1 ]
464	//
465	// Where T = -(Transposed(Rot) * Pos)
466
467	// This is most efficiently done using 3x3 Matrices
468
469	// Get orientation from quaternion
470
471	Matrix3 rot;
472	const Quaternion& orientation = getOrientationForViewUpdate();
473	const Vector3& position = getPositionForViewUpdate();
474	orientation.ToRotationMatrix(rot);
475
476	// Make the translation relative to new axes
477	Matrix3 rotT = rot.Transpose();
478	Vector3 trans = -rotT * position;
479
480	// Make final matrix
481	mViewMatrix = Matrix4::IDENTITY;
482	mViewMatrix = rotT; // fills upper 3x3
483	mViewMatrix[0][3] = trans.x;
484	mViewMatrix[1][3] = trans.y;
485	mViewMatrix[2][3] = trans.z;
486
487	// Deal with reflections
488	if (mReflect)
489	{
490	mViewMatrix = mViewMatrix * mReflectMatrix;
491	}
492
493	// -------------------------
494	// Update the frustum planes
495	// -------------------------
496	updateFrustum();
497
498	Vector3 newpos = position;
499	if (mReflect)
500	{
501	newpos = mReflectMatrix * newpos;
502	}
503	Matrix4 combo = mStandardProjMatrix * mViewMatrix;
504	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.x = combo[3][0] + combo[0][0];
505	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.y = combo[3][1] + combo[0][1];
506	mFrustumPlanes[FRUSTUM_PLANE_LEFT].normal.z = combo[3][2] + combo[0][2];
507	mFrustumPlanes[FRUSTUM_PLANE_LEFT].d = combo[3][3] + combo[0][3];
508
509	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.x = combo[3][0] - combo[0][0];
510	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.y = combo[3][1] - combo[0][1];
511	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].normal.z = combo[3][2] - combo[0][2];
512	mFrustumPlanes[FRUSTUM_PLANE_RIGHT].d = combo[3][3] - combo[0][3];
513
514	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.x = combo[3][0] - combo[1][0];
515	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.y = combo[3][1] - combo[1][1];
516	mFrustumPlanes[FRUSTUM_PLANE_TOP].normal.z = combo[3][2] - combo[1][2];
517	mFrustumPlanes[FRUSTUM_PLANE_TOP].d = combo[3][3] - combo[1][3];
518
519	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.x = combo[3][0] + combo[1][0];
520	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.y = combo[3][1] + combo[1][1];
521	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].normal.z = combo[3][2] + combo[1][2];
522	mFrustumPlanes[FRUSTUM_PLANE_BOTTOM].d = combo[3][3] + combo[1][3];
523
524	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.x = combo[3][0] + combo[2][0];
525	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.y = combo[3][1] + combo[2][1];
526	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.z = combo[3][2] + combo[2][2];
527	mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.normalise();
528	mFrustumPlanes[FRUSTUM_PLANE_NEAR].d =
529	-(mFrustumPlanes[FRUSTUM_PLANE_NEAR].normal.dotProduct(newpos) + mNearDist);
530
531	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.x = combo[3][0] - combo[2][0];
532	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.y = combo[3][1] - combo[2][1];
533	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.z = combo[3][2] - combo[2][2];
534	mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.normalise();
535	mFrustumPlanes[FRUSTUM_PLANE_FAR].d =
536	-(mFrustumPlanes[FRUSTUM_PLANE_FAR].normal.dotProduct(newpos) - mFarDist);
537
538	// Renormalise any normals which were not unit length (not near & far)
539	for(int i=2; i<6; i++ )
540	{
541	float length = mFrustumPlanes[i].normal.normalise();
542	mFrustumPlanes[i].d /= length;
543	}
544
545	// Update worldspace corners
546	Matrix4 eyeToWorld = mViewMatrix.inverse();
547	// Get worldspace frustum corners
548	// Treat infinite fardist as some arbitrary far value
549	Real farDist = (mFarDist == 0)? 100000 : mFarDist;
550	Real y = Math::Tan(mFOVy * 0.5);
551	Real x = mAspect * y;
552	Real neary = y * mNearDist;
553	Real fary = y * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
554	Real nearx = x * mNearDist;
555	Real farx = x * (mProjType == PT_ORTHOGRAPHIC? mNearDist : farDist);
556	// near
557	mWorldSpaceCorners[0] = eyeToWorld * Vector3( nearx, neary, -mNearDist);
558	mWorldSpaceCorners[1] = eyeToWorld * Vector3(-nearx, neary, -mNearDist);
559	mWorldSpaceCorners[2] = eyeToWorld * Vector3(-nearx, -neary, -mNearDist);
560	mWorldSpaceCorners[3] = eyeToWorld * Vector3( nearx, -neary, -mNearDist);
561	// far
562	mWorldSpaceCorners[4] = eyeToWorld * Vector3( farx, fary, -farDist);
563	mWorldSpaceCorners[5] = eyeToWorld * Vector3(-farx, fary, -farDist);
564	mWorldSpaceCorners[6] = eyeToWorld * Vector3(-farx, -fary, -farDist);
565	mWorldSpaceCorners[7] = eyeToWorld * Vector3( farx, -fary, -farDist);
566
567
568	mRecalcView = false;
569
570	}
571
572	}
573
574	//-----------------------------------------------------------------------
575	Real Frustum::getAspectRatio(void) const
576	{
577	return mAspect;
578	}
579
580	//-----------------------------------------------------------------------
581	void Frustum::setAspectRatio(Real r)
582	{
583	mAspect = r;
584	invalidateFrustum();
585	}
586
587	//-----------------------------------------------------------------------
588	const AxisAlignedBox& Frustum::getBoundingBox(void) const
589	{
590	return mBoundingBox;
591	}
592	//-----------------------------------------------------------------------
593	void Frustum::_updateRenderQueue(RenderQueue* queue)
594	{
595	// Add self
596	queue->addRenderable(this);
597	}
598	//-----------------------------------------------------------------------
599	const String& Frustum::getMovableType(void) const
600	{
601	return msMovableType;
602	}
603	//-----------------------------------------------------------------------
604	Real Frustum::getBoundingRadius(void) const
605	{
606	return (mFarDist == 0)? 100000 : mFarDist;
607	}
608	//-----------------------------------------------------------------------
609	const MaterialPtr& Frustum::getMaterial(void) const
610	{
611	return mMaterial;
612	}
613	//-----------------------------------------------------------------------
614	void Frustum::getRenderOperation(RenderOperation& op)
615	{
616	updateView();
617	updateFrustum();
618	op.operationType = RenderOperation::OT_LINE_LIST;
619	op.useIndexes = false;
620	op.vertexData = &mVertexData;
621	}
622	//-----------------------------------------------------------------------
623	void Frustum::getWorldTransforms(Matrix4* xform) const
624	{
625	if (mParentNode)
626	mParentNode->getWorldTransforms(xform);
627	}
628	//-----------------------------------------------------------------------
629	const Quaternion& Frustum::getWorldOrientation(void) const
630	{
631	if (mParentNode)
632	return mParentNode->_getDerivedOrientation();
633	else
634	return Quaternion::IDENTITY;
635	}
636	//-----------------------------------------------------------------------
637	const Vector3& Frustum::getWorldPosition(void) const
638	{
639	if (mParentNode)
640	return mParentNode->_getDerivedPosition();
641	else
642	return Vector3::ZERO;
643	}
644	//-----------------------------------------------------------------------
645	Real Frustum::getSquaredViewDepth(const Camera* cam) const
646	{
647	// Calc from centre
648	if (mParentNode)
649	return (cam->getDerivedPosition()
650	- mParentNode->_getDerivedPosition()).squaredLength();
651	else
652	return 0;
653	}
654	//-----------------------------------------------------------------------
655	const LightList& Frustum::getLights(void) const
656	{
657	// N/A
658	static LightList ll;
659	return ll;
660	}
661	//-----------------------------------------------------------------------
662	const String& Frustum::getName(void) const
663	{
664	// NA
665	return msMovableType;
666	}
667	//-----------------------------------------------------------------------
668	void Frustum::_notifyCurrentCamera(Camera* cam)
669	{
670	// NA
671	}
672
673	// -------------------------------------------------------------------
674	void Frustum::invalidateFrustum() const
675	{
676	mRecalcFrustum = true;
677	}
678	// -------------------------------------------------------------------
679	void Frustum::invalidateView() const
680	{
681	mRecalcView = true;
682	}
683	// -------------------------------------------------------------------
684	const Vector3* Frustum::getWorldSpaceCorners(void) const
685	{
686	updateView();
687
688	return mWorldSpaceCorners;
689	}
690	//-----------------------------------------------------------------------
691	void Frustum::setProjectionType(ProjectionType pt)
692	{
693	mProjType = pt;
694	invalidateFrustum();
695	}
696
697	//-----------------------------------------------------------------------
698	ProjectionType Frustum::getProjectionType(void) const
699	{
700	return mProjType;
701	}
702	//-----------------------------------------------------------------------
703	const Vector3& Frustum::getPositionForViewUpdate(void) const
704	{
705	return mLastParentPosition;
706	}
707	//-----------------------------------------------------------------------
708	const Quaternion& Frustum::getOrientationForViewUpdate(void) const
709	{
710	return mLastParentOrientation;
711	}
712	//-----------------------------------------------------------------------
713	void Frustum::enableReflection(const Plane& p)
714	{
715	mReflect = true;
716	mReflectPlane = p;
717	mLinkedReflectPlane = 0;
718	mReflectMatrix = Math::buildReflectionMatrix(p);
719	invalidateView();
720
721	}
722	//-----------------------------------------------------------------------
723	void Frustum::enableReflection(const MovablePlane* p)
724	{
725	mReflect = true;
726	mLinkedReflectPlane = p;
727	mReflectPlane = mLinkedReflectPlane->_getDerivedPlane();
728	mReflectMatrix = Math::buildReflectionMatrix(mReflectPlane);
729	mLastLinkedReflectionPlane = mLinkedReflectPlane->_getDerivedPlane();
730	invalidateView();
731	}
732	//-----------------------------------------------------------------------
733	void Frustum::disableReflection(void)
734	{
735	mReflect = false;
736	mLastLinkedReflectionPlane.normal = Vector3::ZERO;
737	invalidateView();
738	}
739	//---------------------------------------------------------------------
740	bool Frustum::projectSphere(const Sphere& sphere,
741	Real* left, Real* top, Real* right, Real* bottom) const
742	{
743	// initialise
744	left = bottom = -1.0f;
745	right = top = 1.0f;
746
747	// Transform light position into camera space
748	Vector3 eyeSpacePos = getViewMatrix() * sphere.getCenter();
749
750	if (eyeSpacePos.z < 0)
751	{
752	Real r = sphere.getRadius();
753	// early-exit
754	if (eyeSpacePos.squaredLength() <= r * r)
755	return false;
756
757	Vector3 screenSpacePos = getStandardProjectionMatrix() * eyeSpacePos;
758
759
760	// perspective attenuate
761	Vector3 spheresize(r, r, eyeSpacePos.z);
762	spheresize = getStandardProjectionMatrix() * spheresize;
763
764	Real possLeft = screenSpacePos.x - spheresize.x;
765	Real possRight = screenSpacePos.x + spheresize.x;
766	Real possTop = screenSpacePos.y + spheresize.y;
767	Real possBottom = screenSpacePos.y - spheresize.y;
768
769	*left = std::max(static_cast<Real>(-1.0), possLeft);
770	*right = std::min(static_cast<Real>(1.0), possRight);
771	*top = std::min(static_cast<Real>(1.0), possTop);
772	*bottom = std::max(static_cast<Real>(-1.0), possBottom);
773
774	}
775
776	return (left != -1.0f) \|\| (top != 1.0f) \|\| (right != 1.0f) \|\| (bottom != -1.0f);
777
778	}
779	//---------------------------------------------------------------------
780	void Frustum::enableCustomNearClipPlane(const MovablePlane* plane)
781	{
782	mObliqueDepthProjection = true;
783	mLinkedObliqueProjPlane = plane;
784	mObliqueProjPlane = plane->_getDerivedPlane();
785	invalidateFrustum();
786	}
787	//---------------------------------------------------------------------
788	void Frustum::enableCustomNearClipPlane(const Plane& plane)
789	{
790	mObliqueDepthProjection = true;
791	mLinkedObliqueProjPlane = 0;
792	mObliqueProjPlane = plane;
793	invalidateFrustum();
794	}
795	//---------------------------------------------------------------------
796	void Frustum::disableCustomNearClipPlane(void)
797	{
798	mObliqueDepthProjection = false;
799	mLinkedObliqueProjPlane = 0;
800	invalidateFrustum();
801	}
802	//---------------------------------------------------------------------
803
804	#ifdef GTP_VISIBILITY_MODIFIED_OGRE
805	//-----------------------------------------------------------------------
806	//added by matt: 050405
807	bool Frustum::isVisible(const AxisAlignedBox& bound, bool &intersects, FrustumPlane* culledBy) const
808	{
809	intersects = false;
810
811	// Null boxes always invisible
812	if (bound.isNull()) return false;
813
814	// Make any pending updates to the calculated frustum
815	updateView();
816
817	// Get corners of the box
818	const Vector3* pCorners = bound.getAllCorners();
819
820	// For each plane, see if all points are on the negative side
821	// If so, object is not visible
822	for (int plane = 0; plane < 6; ++plane)
823	{
824	// Skip far plane if infinite view frustum
825	if (mFarDist == 0 && plane == FRUSTUM_PLANE_FAR)
826	continue;
827
828	int corner = 0;
829	bool visible = false;
830
831	while((corner < 8) && (!visible \|\| ((plane == FRUSTUM_PLANE_NEAR) && !intersects)))
832	{
833	if(mFrustumPlanes[plane].getSide(pCorners[corner++]) == Plane::NEGATIVE_SIDE)
834	{
835	if(plane == FRUSTUM_PLANE_NEAR)
836	intersects = true;
837	}
838	else
839	{
840	visible = true;
841	}
842	}
843
844	if(!visible)
845	{
846	// ALL corners on negative side therefore out of view
847	if (culledBy)
848	*culledBy = (FrustumPlane)plane;
849	return false;
850	}
851	}
852
853	return true;
854	}
855	#endif // GTP_VISIBILITY_MODIFIED_OGRE
856	} // namespace Ogre

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source: trunk/VUT/work/ogre_changes/OgreMain/src/OgreFrustum.cpp @ 193

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