This section only describes the representation of phenomena in the .mi language. The declaration of a phenomenon is very similar to the declaration of a shader, except that the keyword shader is replaced with phenomenon, and the addition of new optional statements in the declaration block:
declare phenomenon [type] "phenomenon_name" ( type "parameter_name", type "parameter_name", ... type "parameter_name" ) [version versionint] [shader "name" ...] [material "name" ... end material] [light "name" ... end light] [instance "name" ... end instance] [roots ] [options ] end declare
For a description of version, shader, material, light, and instance definitions, see the corresponding section above; the syntax is identical to the one described there. The order of shaders, materials, lights, and instances is arbitrary, as long as a name is not used before it was defined. The options are identical to the options described in the shader declaration section above. The roots are described below.
The phenomenon phenomenon_name declared with this statement is available for the definition of shaders just like a shader declared with a declare shader statement. Named and anonymous shader definitions can be derived from either type of declaration. Phenomena were designed to extend the concept of shaders, not to replace it.
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