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Subject: get triangles more close to viewer



Hi, I have implement an octree on a triangulate mesh.
I would like project a dynamic lightmap on mesh along viewer
direction.I need to find triangles more close to viewer, and calculate
new texture coordinates .
How can I implement this using octree?
Now I'm casting a ray along the viewer direction and the ray
intersects an octree cell.
How can I find the triangle more close to viewer inside to octree
cell?
In this method I found a only triangle.Maybe I have to use a sphere to
get triangles most close to viewer?
Please help me.

Marco


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