FGFS-4.1/OpenSceneGraph
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Added a ShadowTechnique::computeOrthogonalVector(const osg::Vec3& direction) const method for helping compute an appropriate

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up vector to setViewMatrixAsLookAt(..) codes in osgShadow.  This will addresses previous issues that occured when look vectors
co-incided with the hard coded up vectors.
This commit is contained in:
Robert Osfield
2010-03-01 13:00:04 +00:00
parent 42a050e87c
commit ba3971bb45
4 changed files with 19 additions and 5 deletions
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6
src/osgShadow/ShadowMap.cpp
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@@ -408,7 +408,7 @@ void ShadowMap::cull(osgUtil::CullVisitor& cv)
{
osg::Vec3 position(lightpos.x(), lightpos.y(), lightpos.z());
_camera->setProjectionMatrixAsPerspective(fov, 1.0, 0.1, 1000.0);
_camera->setViewMatrixAsLookAt(position,position+lightDir,osg::Vec3(0.0f,1.0f,0.0f));
_camera->setViewMatrixAsLookAt(position,position+lightDir,computeOrthogonalVector(lightDir));
}
else
{
@@ -435,7 +435,7 @@ void ShadowMap::cull(osgUtil::CullVisitor& cv)
float right = top;
_camera->setProjectionMatrixAsFrustum(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),osg::Vec3(0.0f,1.0f,0.0f));
_camera->setViewMatrixAsLookAt(position,bb.center(),computeOrthogonalVector(bb.center()-position));
}
else // directional light
{
@@ -457,7 +457,7 @@ void ShadowMap::cull(osgUtil::CullVisitor& cv)
float right = top;
_camera->setProjectionMatrixAsOrtho(-right, right, -top, top, znear, zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),osg::Vec3(0.0f,1.0f,0.0f));
_camera->setViewMatrixAsLookAt(position,bb.center(),computeOrthogonalVector(lightDir));
}