Context(s) | displace fog surface |
vector ambient(...)
Returns the color of ambient light in the scene.
Light inclusion/exclusion options ¶
"categories
",
string
="*"
Specifies lights to include/exclude by their “category” tags.
This is the preferred include/exclude lights rather than pattern matching
light names with the "lightmask"
keyword argument.
For example:
diff = diffuse(nml, "lightmask", "hero | fill");
See light categories for more information.
"lightmask
",
string
="*"
When evaluating light and shadow shaders, objects have pre-defined light masks. This mask is usually specified in the geometry object and specifies a list of lights which are used to illuminate a surface or fog shader. It is possible to override the default light mask by specifying a “lightmask” argument.
For example:
diff = diffuse(nml, "lightmask", "light*,^light2");
…will cause all lights whose names begin with “light” except for a light named “light2” to be considered for diffuse illumination.
All Houdini scoping patterns, excepting group expansion, are supported:
-
*
- wild-card match -
?
- single character match -
^
- exclusion operator -
[list]
- character list match
light |
|
surface |