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During startup RenderMan for Katana will automatically load all "discoverable" shaders. Shaders are discoverable if they are found in a search path and (for non-OSL shaders) have an associated Args file. The standard shader search path mechanism is used when searching for shaders with search paths specified either with PrmanGlobalStatements settings or environment variables:
| ShaderType | Environment Variable | PrmanGlobalStatements attribute | Default Path |
|---|---|---|---|
| OSL | RMAN_SHADERPATH | options.searchpath.shader | $RMANTREE/lib/shaders |
| Plugin (C++) | RMAN_RIXPLUGINPATH | options.searchpath.rixplugin | $RMANTREE/lib/plugins |
If both the environment variable and the attribute are set the resulting search path will be the union of the two strings.
Recursion
RfK will automatically recurse down a shader path to find shaders in subdirectories. By default it will recurse down 3 subdirectories. This is configurable using the shaderPathRecursionLimit setting in the RfK config file, config.xml.
Args Files
The args files need to be in an Args directory. See the setup in RMANTREE/lib/plugins for an example. Something like this:
RMAN_RIXPLUGINPATH directory:
$RMAN_TAF_RIXPLUGINPATH/pattern_remap.so |
$RMAN_RIXPLUGINPATH/Args/_TAF_pattern_remap.args |
You can find out more about Args files in the developer docs download.