Horde3D

Is there a good way to handle back face and front face culling within Horde3D? The only way I know is to directly set this option with OpenGL, but I think that a flag within the pipeline xml file would be great.

My problem is that I need to render the front face and the back face in two different buffers to calculate some effects, and I can't really switch between back face and front face culling in the pipeline. I could switch off this culling and check within GLSL if its the back face or the front face, but I don't want to add a condition at the beginning of each shaders.

Unfortunately, at the moment, there is no other way than the shader method you mentioned. But we will certainly add some way to configure the backface culling for 1.0.

Hello!

Is there a way now to configure the two-sided faces?

A small variation on this is the recommended way to accomplish this, last I checked.

Attach *both* target buffers via MRT, and check the value of gl_FrontFacing to decide which buffer to send this fragment to. Even though it adds a branch to your shader, modern GPUs are much better at branching, and you only use one pass, rather than two.

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Tristam MacDonald - [swiftcoding]

CullMode=None

Also, with two-sided faces, you must modify the shader so that lighting is computed correctly.

After the line where the normal is computed (e.g. "vec3 normal = ..."), add in:
normal *= gl_FrontFacing ? 1.0 : -1.0;