Unfortunatly Thermite doesn't show everything you need to know - there is some shader code to go with it which is part of the game rather than being part of Thermite. Basically you need the following steps:
1) Create the 3D array comtaining the data, using the PolyVox AmbientOcclusionCalculator. You can also try just filling the array with a 3D checkerboard pattern or something, for debugging.
2) Copy the 3D array into a Ogre volume texture.
3) Declare the texture to your material. Be aware, you might need to be careful to make sure the texture has been created in code before the material actually tries to use it.
Code:
texture_unit
{
texture AmbientOcclusionVolumeTexture 3d
tex_address_mode clamp
}
{
texture AmbientOcclusionVolumeTexture 3d
tex_address_mode clamp
}
4) Pass the texture as a parameter to your pixel shader and sample it to apply the lighting. Note that you need to know the volume size to do this:
Code:
float ambientVal = tex3D(ambientMap, (inWorldPosition.xyz + float3(0.499f, 0.499f, 0.499f)) / float3(256.0f, 64.0f, 256.0f));
I've attached some code you might find useful.
| Attachments: |
VoxelMaterial.zip [3.67 KiB]
Downloaded 373 times |
I found it to be the most helpful in regard to ambient occlusion.