shader_type spatial;
render_mode cull_front, unshaded;

// Inverted-hull outline. Assign as material_overlay on a GeometryInstance3D:
// the mesh renders a second time, grown along its normals with front faces
// culled, leaving a colored shell visible only at the silhouette.

uniform vec4 outline_color : source_color = vec4(0.06, 0.05, 0.09, 1.0);
uniform float outline_width : hint_range(0.0, 0.1) = 0.02;

void vertex() {
	VERTEX += NORMAL * outline_width;
}

void fragment() {
	ALBEDO = outline_color.rgb;
}