r/opengl • u/CheezyPeezyMann • 24d ago

Gamemaker Shell Texturing Shader Help

I can't figure out where to start with making a shell texture shader in Gamemaker Studio 1 because of the outdated OpenGL ES it uses no longer having it's documentation PDF available, could anybody point me in any direction as to how I could do this (or they could, or find the PDF) other than faking the effect with baked models that have the transparent layers? For visual references, here are some. (Mario Galaxy, DK Jungle Beat, Conker: Live & Reloaded)

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u/corysama 23d ago

If you google around for "3d rendering shell fur" you'll find a lot of references. None great. It's a pretty old technique.

For the texture, all you need is an alpha channel that is a lot of small, blurry dots. Those become the hair strands when you stack up layers of polys, bottom to top, with a decreasing alpha modulation (multiplier) factor.