Having real difficulties debugging what should be a very simple shader. I've had trouble with shaders in Game Maker before, and now I'm having them again. It could be something fundamental in the shader set up I'm missing--I see posts about the "Use for 3d" box, but that doesn't seem to be present in GMS2. Something like that would correspond with the trouble I'm running into currently. Gonna give up and try again tomorrow.

Struggled tonight with the new callable functions. I need to figure out how to serve it locally because the deployed functions don't give much debugging help. Maybe I can give this a try next time:

https://stackoverflow.com/questions/49687090/testing-callable-cloud-functions-in-firebase-serve