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New glTF extensions support refraction, color attenuation, and volumetric properties.
The Khronos Group has announced the public release of the latest set of Physically Based Rendering (PBR) material extensions for the Khronos glTF 3D asset format. The new extensions enable material properties such as refraction, color attenuation, and volumetric properties to be used by diverse renderers from real-time rasterization to production-class path-tracing.
Three new PBR material extensions for IOR, specularity, and volume properties:
- KHR_materials_ior specifies a material’s index of refraction and describes the way that light is scattered as it passes through translucent or transparent materials.
- KHR_materials_specular describes a material’s specular properties. Unlike its predecessor, KHR_materials_pbrSpecularGlossiness, it works within a standard modern metallic/roughness PBR workflow.
- KHR_materials_volume is probably the least self-descriptive of the three and enables mesh surfaces to act as an interface between volumes to enable more realistic refraction and absorption.
These extensions allow a wider range of scenes and objects to be represented realistically as 3D assets. For example, they enable artists to create more beautifully lit virtual photoshoots of products for e-commerce.
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