I may have found the problem.

I converted the mesh2 terrain.pov to an obj file in Poseray, and 
imported that into Silo. It appears that the faces of the terrain do 
/not/ have normals. I know that your mesh2 objects /have/ normals in 
their normals block, but somehow those are not read by the trace 
function. So, what are they? Do they refer to the triangle faces or are 
they related to the triangle vertices? If the later, trace will not work 
I believe.

-- 
Thomas

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