Hi
check if you treat directional light in a right way (i mean use light direction
instead of position and such)
28.03.2012, 13:29, Andrey Ibe xry...@gmail.com:
Hi,
i am doing an off-line ray-tracing. at the beginning of the computation i
fetch all the lights and then use them.
the problem is, i am not getting the correct light position, obviously. i
attached two pictures showing the difference between the position the
osg::viewer is getting and the one i'm getting for the ray-tracing. the
pictures feature a solo directional light. in the viewer picture you can
guess the position of the light by the specular reflection on the pink
object. it seems to be exactly on the opposite side compared to the
ray-traced image.
so far this only happened with the directional light for this model, but i
start to suspect, that the other lights (in different models) are not
positioned correctly either.
i fetch the lights using a lightsource visitor, taht collects the light
sources, then i use getWorldMatrices() and take the first transformation
matrix, finally i multiply the light's position and directions. this is the
code:
Code:
void RayManager::collectLightSources(WorldLightSourceContainer lc) const {
osg::ref_ptrLightSourceVisitor lVisitor = new
LightSourceVisitor(lc.sources);
_scene-accept(*(lVisitor.get()));
for (LightSources::iterator lsIt = lc.sources.begin(); lsIt !=
lc.sources.end(); lsIt++) {
osg::MatrixList worldMatrices = (*lsIt)-getWorldMatrices();
// take the first world matrix
osg::Matrix m = worldMatrices.front();
lc.positions.push_back((*lsIt)-getLight()-getPosition()
* m);
osg::Vec3d direction =
(*lsIt)-getLight()-getDirection() * m;
direction.normalize();
lc.directions.push_back(direction);
}
}
and this is the code for my lighSource visitor
Code:
LightSourceVisitor::LightSourceVisitor(LightSources lightSources) :
osg::NodeVisitor(TRAVERSE_ALL_CHILDREN),
_lightSources(lightSources) {
}
void LightSourceVisitor::apply(osg::LightSource node) {
_lightSources.push_back(node);
osg::NodeVisitor::apply((osg::Group)node);
}
am i doing something wrong ? the code seems to work for the two other lights
(which are turned off in the attached pictures), that's what worries me.
Thank you!
Cheers,
Andrey
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=46645#46645
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