Considering the example below:
var mat = new THREE.MeshLambertMaterial({'color': ..., 'map': ...});
How does changing the color affect the final appearance in situations where the color is set to the average pixel value of the map, white, or black?
When a .map is specified for a material, the documentation mentions that the material's color "modulates" the diffuse map. What is the exact meaning of modulation in this context?
The source code for the standard shaders in three.js can be found at the following link: standard three.js shaders. Within the meshlambert_frag.glsl file, you will find the lines #include <map_fragment> and #include <color_fragment>. These ShaderChunk includes are processed during the compilation of the webgl program.
Upon inspecting the map_fragment.glsl and color_fragment.glsl files, it is evident that the diffuseColor is multiplied by color after the map color is applied.
Additionally, there are Shader Editor browser extensions that can be utilized to explore the source code of shaders being utilized in webgl.
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