Specular shader chunk

[wturber]

Perhaps it is metalnessPS? I’m inferring that from the references below which are a bit over my head.

https://github.com/playcanvas/engine/blob/master/src/graphics/program-lib/standard.js#L1307

and here:

Custom vertex attributes in chunk

We have a nice chunk system which allows us to create shaders, override some parts and etc. But it could be even more powerful with custom attributes. Currently, we have custom vertex attribute semantics such a pc.SEMANTIC_ATTR0-15, but we can’t set in into a shader’s definition for “standard” for instance. We also have pc.shaderChunks.collectAttribs which can detect custom attributes in code and add it before compiling process. What do you think? If it’s okay for workflow, I would like to t…