First: why does it work?
void main() {
gl_FragColor = vec4(1.0, 0.0, 0.0, 0.0);
}
I mean alfa value does not work. I have red color with alfa 0.0
Second: why does a Sprite3D’s color mix with parent?
The cat is a child of this red splash.
1:
Sorry, but I can’t help you. I just use Sprite3D with textures, but it probably is a bad idea.
2:
It shouldn’t. Does the cat sprite have transparency? It shouldn’t mix when the red cuboid has a texture or a color.