I finally find the reason of my second issue (the shadow disappears some time, because of the view matrix computation from the light) and already submit a patch for both problems. Now I'd like to try to work out a more comfortable shader solution for this great shadow technique and see if it could make the life better. :-)
Wang Rui 2012/3/14 Wang Rui <[email protected]> > Hi Robert, > > Some comments on my last post. It may not be a projection matrix > problem... I've found that in the ViewDependentShadowMap.cpp file, > implementation > of class ComputeLightSpaceBounds: > > void update(const osg::Vec3& v) > { > if (v.z()<0.0f) > { > //OSG_NOTICE<<"discarding("<<v<<")"<<std::endl; > return; > } > ... > } > > Should it be "v.z()<-1.0" here as the clipping space coordinates are in > the range of [-1, 1]? I changed this line and it works for me; otherwise > the city on earth will be splitted in a strange way as shown in > the attached snapshot. > > But I'm still struggling with another serious problem that the whole > shadow map may disappear suddenly when I'm looking with a horizontally > view from the opposite direction of the light vector. I checked the code > and surprisingly found that the ComputeLightSpaceBounds returns an > invalid bounding box in such case. That means the entire scene may be > culled as in the light space frustum? I'm just confused now but will go on > tomorrow. > > Any good ideas about that? :-) > > Wang Rui > > >
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