linear depth (4.3+)

Get a linear depth value from the DEPTH_TEXTURE (4.3+).

Apply this shader to a quad, which is attached to the camera.

Shader code

shader_type spatial;
render_mode unshaded, depth_draw_never;

uniform float depth_factor: hint_range(0.0, 256.0, 0.1) = 80.0;

uniform sampler2D DEPTH_TEXTURE: hint_depth_texture;

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);
	
	ALBEDO = vec3(linear_depth / depth_factor);
}

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