This change adds support for the KHR_materials_dispersion glTF extension, which introduces a dispersion property for refractive materials.
The dispersion property controls the angular separation of colors transmitting through a refractive object, allowing for more realistic rendering of materials like glass and diamonds.
Changes include:
- Added a dispersion property to the material definition.
- Updated the shaders to incorporate the dispersion effect in the refraction calculations.
- Added a new test case for dispersion.
- Updated the material documentation to include the new dispersion property.
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