Initial VDF support in hardware shading - #2809
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jstone-lucasfilm merged 1 commit intoMar 13, 2026
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This changelist adds initial support for Volume Distribution Functions (VDFs) in hardware shader generation, giving the VDF type its own struct, and approximating volumetric light absorption for the transmissive term. The following specific changes are included: - Add a dedicated VDF struct to GLSL, MSL, and Slang, replacing the previous use of the BSDF struct as an alias for the VDF type. - Add a simple approximation of volumetric absorption to `mx_anisotropic_vdf`, computing throughput using Beer's law in the transmissive lighting term. - Fix `mx_layer_vdf` to multiply the surface response and throughput by the volume throughput, replacing the previous placeholder math.
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To provide visual intuition for the impact of this change, here are before and after renders for a simple OpenPBR Tinted Glass material in the MaterialX Viewer: OpenPBR Tinted Glass (Before): OpenPBR Tinted Glass (After): |
jstone-lucasfilm
merged commit Mar 13, 2026
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AcademySoftwareFoundation:main
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This changelist adds initial support for Volume Distribution Functions (VDFs) in hardware shader generation, giving the VDF type its own struct, and approximating volumetric light absorption for the transmissive term. The following specific changes are included:
mx_anisotropic_vdf, computing throughput using Beer's law in the transmissive lighting term.mx_layer_vdfto multiply the surface response and throughput by the volume throughput, replacing the previous placeholder math.