Strange normals [SOLVED]

[michax]

I've encountered strange normals for smooth surface. Looks like forced hard edges, or messed up vertex normals.
I tested and problem occurs everytime on every light scenario. Not sure why i didn't find it before. Event when using subdivision, problem is visible (less, but still).

Mesh is triangulated and vertices are sorted (x axis).

Preview (no subdiv):



Preview (subdiv):
https://dl.dropboxusercontent.com/u/258 ... subdiv.jpg

Blender scene:
https://dl.dropboxusercontent.com/u/258 ... th_1.blend

I'm using latest version of python exporter. I tested scene in blender versions:
2.67
2.66
2.64 (no bmesh)

Also tested with VrayBlender (cpp exporter), and same problem occurs.

I though maybe it's caused by bmesh as i had problems with it before. But those problems were solved by triangulation and sorting vertices before vray render.
But in this case i didn't find solution.

Are you guys have similar problem or am I alone with this one ?

Thanks for help.

[michax]

Re: Strange normals

To fast to furious. Problem is not caused by normals but by shadow volumes casted on low poly mesh. Bias value fixed the problem.



However, shadow problem on high poly model still seem a little strange. But with proper bias everything can be smoothed out for a price of shadow accuracy.