$halflambert

Lambertian (left) and Half Lambertian (right)

$halflambert is a material shader parameter for the VertexLitGeneric, Teeth, EyeRefract, VortWarp, and Infected (shader) shader available in all Source games. It is a boolean parameter that enables half-lambertian lighting, which wraps lighting further around a model to prevent it from losing definition. It only works on models.

Important:Since Source 2007, half-lambertian lighting is forcibly enabled on VertexLitGeneric regardless of $halflambert setting when $phong is enabled, unless $phongdisablehalflambert(in all games since ) is enabled.

Note:This parameter is disabled since due to conflicts with cascade shadow mapping.

Important:Not designed for static props:

• Does not work on static props which have lighting baked per-vertex or into lightmaps in stock VRAD; this could be achieved with a custom VRAD.
• Shadows cast by static props will always be full-lambertian. This could potentially be worked around by using an %alphatexture with half opacity.

Syntax

$halflambert 1