/**
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* Struct for representing a material for a {@link ModelExperimental}. The model
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* rendering pipeline will pass this struct between material, custom shaders,
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* and lighting stages. This is not to be confused with {@link czm_material}
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* which is used by the older Fabric materials system, although they are similar
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*
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* @name czm_modelMaterial
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* @glslStruct
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*
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* @property {vec3} diffuse Incoming light that scatters evenly in all directions.
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* @property {float} alpha Alpha of this material. 0.0 is completely transparent; 1.0 is completely opaque.
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* @property {vec3} specular Color of reflected light at normal incidence in PBR materials. This is sometimes referred to as f0 in the literature.
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* @property {float} roughness A number from 0.0 to 1.0 representing how rough the surface is. Values near 0.0 produce glossy surfaces, while values near 1.0 produce rough surfaces.
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* @property {vec3} normalEC Surface's normal in eye coordinates. It is used for effects such as normal mapping. The default is the surface's unmodified normal.
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* @property {float} occlusion Ambient occlusion recieved at this point on the material. 1.0 means fully lit, 0.0 means fully occluded.
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* @property {vec3} emissive Light emitted by the material equally in all directions. The default is vec3(0.0), which emits no light.
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*/
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struct czm_modelMaterial {
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vec3 diffuse;
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float alpha;
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vec3 specular;
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float roughness;
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vec3 normalEC;
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float occlusion;
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vec3 emissive;
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};
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