White Tunnel/Fake Light

Based off of this tunnel shader, but retooled to be fading white light, useful for faking light holes in a ceiling or whatever

Just put it on a plane mesh 3d and apply the shader, edit the hole depth and make sure the mesh is rotated the correct way and you’re good to go

Shader code

shader_type spatial;
render_mode unshaded, blend_mix;

uniform sampler2D depth_texture : hint_depth_texture;
uniform float hole_depth : hint_range(0.1, 10.0, 0.1) = 1.0;

void fragment() {
	
	float depth = texture(depth_texture, SCREEN_UV).r;
	
	
	float linear_depth = 1.0 / (depth * INV_PROJECTION_MATRIX[2].w + INV_PROJECTION_MATRIX[3].w);
	
	
	linear_depth = linear_depth + VERTEX.z;
	
	
	float fade = clamp(linear_depth / hole_depth, 0.0, 1.0);
	
	
	ALBEDO = vec3(1.0);
	
	
	ALPHA = fade;
}

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