"Shadow to Opacity" requires bright ambient light? (Easy shader alternative)

Wolfe

With the "Shadow to Opacity" SpatialMaterial flag set, the opacity is multiplied by the ambient light color and energy. Shadows are only opaque if illuminated by ambient light. In a scene with less/no ambient light, the shadowed areas are translucent or invisible.

Is that how it is intended to work?

I got pretty much what I wanted with a very short shader, anyway:

shader_type spatial;

void light() {
	DIFFUSE_LIGHT = vec3(0.0);
	ALPHA = 1.0 - ATTENUATION.z;
}

cybereality

That is the point of it. It turns the shadow into invisible (hence opacity zero).

Wolfe

The flag works the opposite way with all other light; only what is in shadow and not lit by other sources is visible. The rest of the material is invisible.

Lighting modifies the alpha so shadowed areas are opaque and non-shadowed areas are transparent. Useful for overlaying shadows onto a camera feed in AR.

cybereality

Might be a bug then. I'm not sure.

Wolfe

OK, I thought I'd make a quick check if I'm missing something before opening an issue.