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Demystifying exporting light maps from 3ds Max to Vizard?
Hey all.
So when following the steps in the Vizard documentation on baking and exporting light maps from 3ds Max I started wondering about a few things. I am an experienced Maya and Unity User so I kinda wanted to know whats being generated and whats being exported during this process. Is 3ds Max creating a 2nd UV set with automatically laid UVs with a monochromatic light map? Is 3ds max overwriting your current UVs and baking the lighting information directly onto your diffuse? When you export the newly light baked models from Max to Vizard, what is being transfered? Is it 2 separate maps such as a Light Map and your original Diffuse? Is it 1 map with lighting baked directly into your diffuse? How does vizard process this lighting information? When exporting with "lighting turned off", does vizard have any light source in its scenes? Are the light sources read from the exported lighting information from the osgb? I am not a fan of 3ds Max's scene management. It is very difficult to work in a scene with many objects and a million+ triangle count. I would rather bake lighting in Maya and transfer over the baked meshes to 3ds Max in FBX form. Knowing how Vizard reads light map information will help me create this workflow. Thanks from IVC Greenville! -patrick |
#2
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Hi Patrick,
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Vizard R4 uses the OpenGL Fixed Function Pipeline shader, which is fairly simplistic in the way it handles maps (and lighting). In short, the FFP has no knowledge of what most maps are actually meant to do and simply multiplies the values against each other, sometimes with a scale factor applied (lightmap scale option in the exporter, 2x recommended). This works very well for combining lightmaps with diffuse maps (lighting hitting the surface * the diffuse reflectance of the surface = final brightness), but the use of things like specular maps require fragment shaders. GLSL fragment shaders are possible in R4 but must supplied by the user. This will no longer be an issue in R5. |
Tags |
3ds max, light baking, maya, osgb export, uv sets |
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