Shadows based on albedo?

Goldtooth

Is there a way to cast a shadow based on a texture/face's albedo? For example, cast a checkered pattern on the wall when given:

cybereality

Yes. On the material for the checkerboard texture, select under flags "Transparent" on. Then under parameters, look for "depth draw" and set it to "opaque pre-pass". Then you will have shadows from the texture (assuming the texture has an alpha channel).

Goldtooth

Is there a way to enable "opaque pre-pass" w/in a fragment shader? I know that you can add additional shader passes, but it doesn't seem to use the fragment result (by design?).

TwistedTwigleg

I believe you can set a flag in the shader to make it use an opaque pre-pass, but I think it applies to the whole shader rather than the fragment function.

Looking at the documentation, I think the flag is depth_draw_alpha_prepass.

Goldtooth

That's exactly what I was looking for! Thanks everyone!