Thanks again, I figured out the blend mode I was looking for was available without using a gl constant, it was actually an obvious one I just looked over, BABYLON.Engine.ALPHA_DISABLE
As for opacityTexture, that may be what I need next to fix the artifacts I see, but you can get a feel for what I’m trying to do with this playground: https://playground.babylonjs.com/#8NGJT7#3 Hopefully seeing it makes it more clear what I’m trying to do than my poor explanations.
Getting really, really close now, thanks for the support.