/**
* Get the radiance seen through a particular pixel
*
* @param istate intersection state for ray tracing
* @param rx pixel x coordinate
* @param ry pixel y coordinate
* @param lensU DOF sampling variable
* @param lensV DOF sampling variable
* @param time motion blur sampling variable
* @param instance QMC instance seed
* @return a shading state for the intersected primitive, or
* <code>null</code> if nothing is seen through the specifieFd
* point
*/
public ShadingState getRadiance(IntersectionState istate, float rx, float ry, double lensU, double lensV, double time, int instance)
{
if (bakingPrimitives == null)
{
Ray r = camera.getRay(rx, ry, imageWidth, imageHeight, lensU, lensV, time);
return(r != null?lightServer.getRadiance(rx, ry, instance, r, istate) : null);
}
else
{
Ray r = new Ray(rx / imageWidth, ry / imageHeight, -1, 0, 0, 1);
traceBake(r, istate);
if (!istate.hit())
{
return(null);
}
ShadingState state = ShadingState.createState(istate, rx, ry, r, instance, lightServer);
bakingPrimitives.prepareShadingState(state);
if (bakingViewDependent)
{
state.setRay(camera.getRay(state.getPoint()));
}
else
{
Point3 p = state.getPoint();
Vector3 n = state.getNormal();
// create a ray coming from directly above the point being
// shaded
Ray incoming = new Ray(p.x + n.x, p.y + n.y, p.z + n.z, -n.x, -n.y, -n.z);
incoming.setMax(1);
state.setRay(incoming);
}
lightServer.shadeBakeResult(state);
return(state);
}
}