From Adrian Egli, "update the PSSM, i did some bug fixes and added new features to move the camera virtual against the view direction by applaying a simple distance factor (a), which is calculated camera eye - camera center distance. and we can move the "light camera" against the light direction (b).
(a) some objects behind the camera can cast shadow (b) object aboive the camera can cast shadow then i fixed the shadow map orientation, now screen x coordinate alinged which improve the quality"
This commit is contained in:
Robert Osfield
@@ -48,6 +48,7 @@ using namespace osgShadow;
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#define ZNEAR_MIN_FROM_LIGHT_SOURCE 2.0
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#define MOVE_VIRTUAL_CAMERA_BEHIND_REAL_CAMERA_FACTOR 0.0
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//#define SHOW_SHADOW_TEXTURE_DEBUG // DEPTH instead of color for debug information texture display in a rectangle
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@@ -167,7 +168,8 @@ ParallelSplitShadowMap::ParallelSplitShadowMap(osg::Geode** gr, int icountplanes
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_isSetMaxFarDistance(false),
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_useFrontCullFace(false),
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_split_min_near_dist(ZNEAR_MIN_FROM_LIGHT_SOURCE),
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_linearSplit(LINEAR_SPLIT)
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_linearSplit(LINEAR_SPLIT),
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_move_vcam_behind_rcam_factor(MOVE_VIRTUAL_CAMERA_BEHIND_REAL_CAMERA_FACTOR)
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{
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_displayTexturesGroupingNode = gr;
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_number_of_splits = icountplanes;
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@@ -188,8 +190,8 @@ ParallelSplitShadowMap::ParallelSplitShadowMap(const ParallelSplitShadowMap& cop
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_linearSplit(copy._linearSplit),
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_number_of_splits(copy._number_of_splits),
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_polgyonOffset(copy._polgyonOffset),
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_setMaxFarDistance(copy._setMaxFarDistance)
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_setMaxFarDistance(copy._setMaxFarDistance),
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_move_vcam_behind_rcam_factor(copy._move_vcam_behind_rcam_factor)
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{
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}
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@@ -668,8 +670,18 @@ void ParallelSplitShadowMap::calculateFrustumCorners(
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osg::Matrixf viewMat;
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osg::Vec3d camEye,camCenter,camUp;
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pssmShadowSplitTexture._cameraView.getLookAt(camEye,camCenter,camUp);
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osg::Vec3d viewDir = camCenter - camEye;
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//viewDir.normalize();
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camEye = camEye - viewDir * _move_vcam_behind_rcam_factor;
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camFar += _move_vcam_behind_rcam_factor * viewDir.length();
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viewMat.makeLookAt(camEye,camCenter,camUp);
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if ( _isSetMaxFarDistance ) {
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if ( camNear + _setMaxFarDistance < camFar) camFar = camNear + _setMaxFarDistance;
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if (_setMaxFarDistance < camFar) camFar = _setMaxFarDistance;
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}
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//////////////////////////////////////////////////////////////////////////
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@@ -716,17 +728,15 @@ void ParallelSplitShadowMap::calculateFrustumCorners(
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//////////////////////////////////////////////////////////////////////////
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/// TRANSFORM frustum corners (Optimized for Orthogonal)
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osg::Matrixf invProjViewMat;
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osg::Matrixf projMat;
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projMat.makePerspective(fovy,aspectRatio,camNear,camFar);
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osg::Matrixf projViewMat(pssmShadowSplitTexture._cameraView*projMat);
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osg::Matrixf projViewMat(viewMat*projMat);
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invProjViewMat.invert(projViewMat);
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//transform frustum vertices to world space
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frustumCorners[0] = const_pointFarBR * invProjViewMat;
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frustumCorners[1] = const_pointNearBR* invProjViewMat;
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@@ -764,45 +774,56 @@ void ParallelSplitShadowMap::calculateLightNearFarFormFrustum(
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// force zNear > 0.0
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// set 2.0m distance to the nearest point
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// set _split_min_near_dist(2.0m) distance to the nearest point
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int count = 0;
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while (zNear <= _split_min_near_dist && count++ < 10) {
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// init zNear, zFar
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zNear= DBL_MAX;
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zFar =-DBL_MAX;
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// calculate zNear, zFar
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for(int i=0;i<8;i++) {
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double dist_z_from_light = pssmShadowSplitTexture._lightDirection*(frustumCorners[i] - pssmShadowSplitTexture._lightCameraSource);
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if ( zNear > dist_z_from_light ) zNear = dist_z_from_light;
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if ( zFar < dist_z_from_light ) zFar = dist_z_from_light;
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}
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}
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// update if zNear too small
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if ( zNear <= _split_min_near_dist ){
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osg::Vec3 dUpdate = - pssmShadowSplitTexture._lightDirection*(fabs(zNear)+_split_min_near_dist);
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pssmShadowSplitTexture._lightCameraSource = pssmShadowSplitTexture._lightCameraSource + dUpdate;
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}
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}
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pssmShadowSplitTexture._lightCameraTarget = pssmShadowSplitTexture._lightCameraSource + pssmShadowSplitTexture._lightDirection*zFar;
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pssmShadowSplitTexture._lightNear = zNear;
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pssmShadowSplitTexture._lightCameraTarget = pssmShadowSplitTexture._frustumSplitCenter;//pssmShadowSplitTexture._lightCameraSource + pssmShadowSplitTexture._lightDirection;//*zFar;
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pssmShadowSplitTexture._lightNear = 0.1;//zNear;
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pssmShadowSplitTexture._lightFar = zFar;
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}
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void ParallelSplitShadowMap::calculateLightViewProjectionFormFrustum(PSSMShadowSplitTexture &pssmShadowSplitTexture,osg::Vec3d *frustumCorners) {
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//////////////////////////////////////////////////////////////////////////
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// light dir
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osg::Vec3d lightDir = pssmShadowSplitTexture._lightDirection;
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osg::Vec3d up(0,1,0);
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// calculate top, left
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osg::Vec3d top(0,0,1);
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osg::Vec3d left;
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osg::Vec3d top;
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osg::Vec3d lightDir = pssmShadowSplitTexture._lightDirection;
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lightDir.normalize();
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osg::Vec3d camEye,camCenter,camUp;
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pssmShadowSplitTexture._cameraView.getLookAt(camEye,camCenter,camUp);
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left = up ^ lightDir;
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top = lightDir ^ left;
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osg::Vec3d viewDir(camCenter-camEye);
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viewDir.normalize();
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osg::Vec3d camLeft = camUp ^ viewDir;
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camLeft.normalize();
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top = lightDir ^ camLeft;
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left = top ^ lightDir;
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double maxLeft,maxTop;
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double maxLeft,maxTop;
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double minLeft,minTop;
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osg::Vec3d fCenter = pssmShadowSplitTexture._frustumSplitCenter;
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@@ -811,32 +832,25 @@ void ParallelSplitShadowMap::calculateLightViewProjectionFormFrustum(PSSMShadowS
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minLeft = minTop = DBL_MAX;
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for(int i = 0; i < 8; i++)
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{
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osg::Vec3d diffCorner = fCenter - frustumCorners[i];
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double lLeft = (diffCorner*left) * 1.5; // scale, removes edges problem, faster for calculation
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double lTop = (diffCorner*top) * 1.5; // scale, removes edges problem, faster for calculation
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osg::Vec3d diffCorner = pssmShadowSplitTexture._frustumSplitCenter - frustumCorners[i];
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double lLeft = (diffCorner*left) * 1.41425;
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double lTop = (diffCorner*top) * 1.41425;
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if ( lLeft > maxLeft ) maxLeft = lLeft;
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if ( lTop > maxTop ) maxTop = lTop ;
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if ( lTop > maxTop ) maxTop = lTop;
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if ( lLeft < minLeft ) minLeft = lLeft;
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if ( lTop < minTop ) minTop = lTop ;
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}
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if ( lTop < minTop ) minTop = lTop;
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}
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osg::Matrixd lightView;
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lightView.makeLookAt(pssmShadowSplitTexture._lightCameraSource,pssmShadowSplitTexture._lightCameraTarget,up);
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lightView.makeLookAt(pssmShadowSplitTexture._lightCameraSource,pssmShadowSplitTexture._lightCameraTarget,top);
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osg::Matrixd lightProj;
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double zNear = pssmShadowSplitTexture._lightNear;
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double zFar = pssmShadowSplitTexture._lightFar;
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lightProj.makeOrtho(minLeft,maxLeft,minTop,maxTop,zNear,zFar);
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lightProj.makeOrtho(minLeft,maxLeft,minTop,maxTop,pssmShadowSplitTexture._lightNear,pssmShadowSplitTexture._lightFar);
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pssmShadowSplitTexture._camera->setViewMatrix(lightView);
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pssmShadowSplitTexture._camera->setProjectionMatrix(lightProj);
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}
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