$color_depth

$color_depth is a material shader parameter for the DepthWrite shader available in all  Source games. It outputs a color value as depth in the shader. Used in _rt_ResolvedFullFrameDepth as a Depth buffer. It can be useful for Screen Space Ambient Occlusion (SSAO).

Formula

The colored depth output differs between branches. For example  Source SDK Base 2013 uses a magic number 4000 as a divisor. This must be taken into account when creating shaders.

Engine branch	Formula
CS:GO engine branch	ProjPosZ / ProjPosW
Team Fortress 2 branch	ProjPosW / 4000

Note: Since the  Team Fortress 2 branch outputs ProjPosW, it does not work with orthographic projections, as orthographic projections lack perspective distortion.

VMT Syntax

$color_depth <bool>

DepthWrite
{
	$color_depth 1
}