Mutation is used to introduce diversity into the population. After breeding, the hierarchy of a shader is traversed, input variables are randomly selected from a uniform distribution and changed to other valid values. This selection depends on your assigned mean Variable Mutation rate (VM). Similarly, a node function can mutate to another type of function, for example an abs function may mutate to a sin function. This selection depends on your assigned Node Mutation rate (NM). Selected subtrees may be replaced by predefined nodes or subtrees from a prebuilt library.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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