List of shaderParm variables

Variables named shaderParm0 to shaderParm11 influence the rendering of certain materials. They are either set once in the map editor for some specific entity, or at run-time by various scripts or the C++ code.

Inside material definitions, these can be accessed via parm0 ... parm11.

The parms are on a per-entity base, so you can f.i. influence the material (and thus color) of entities or the color of the light.

See also the list of global variables.

List of shaderParms

#	Value	Used by	Type
0	0.00 to 1.00	Red value set by _color spawnarg in the editor	once
1	0.00 to 1.00	Green value set by _color spawnarg in the editor	once
2	0.00 to 1.00	Blue value set by _color spawnarg in the editor	once
3	0.00 to 1.00 (or to X.yz) Set by spawnarg shaderParm3 on the entity in the editor.	Materials: Alpha (transparency) value, eg, alphatest 0.8. Also used in some LOD materials as the alpha threshold, in this case the engine adjusts the value between 0 and 1.0 at runtime depending on distance to the player. Foglights: Distance in units beyond which fog is completely opaque (so higher values make fog thinner.)	once run-time
4	0 to 1	set shaderparm4 on flickering lights with a value 0 to 1 to vary the flicker offset so they don't all flicker in sync.	?
5	?	?	?
6	?	?	?
7	0..1 (brightness)	Used by the moon-light textures in textures/darkmod/sfx/	once
8	0.01 .. 0.5	Used by atdm:liquid entities to control the speed of the water-texture-waves	run-time
9	1.0 .. 2	Used by atdm:liquid entities to control the speed of the water (purpose is not clear a.t.m.)	run-time
10	?	?	?
11	0 or 1	non-zero when something is highlighted for frob. This is used by material definitions to make materials "light up" when entities are in the frob-highlight.	run-time

See also

• The list of global variables
• List of all spawnargs