I have been billboard texturing trees - simple planes with an image mapped to them. I was using a single texture channel - a png image of a tree with an alpha channel. I set the material alpha to 1, then the texture channel to:
Ref,Spec,Amb,Alpha: On yellow
The image on the plane loaded fine, but the shadow appeared to glow (see attached).
If I change all the texture settings so I have the material alpha to 0, then a texture channel with:
Ref,Spec,Amb: On yellow
…and a second texture channel of the identical same image with
then the image and shadow work fine.
Is this a bug in blender? I can’t imagine glowing shadows are ever desirable, but I also couldn’t find anyone else with the glowing shadows problem searching the internet. Why does the second way work and not the first? Surely they both should have the same effect except that the second takes twice as much work?