Is there a way to modify the rgb values of a texture from a script or do I need to make several different textures and just assign a different one depending on the values?
Thanks
There is the option of using the tint colour in the GUI or Shader variables, but it would be easier to just swap the texture with another.
SetPixel is also available but may be too much work.
Without knowing the effect you are aiming for it’s difficult to recommend.
I am am making an evolution type project where the child inherits from both parents plus a mutation factor, so I would like something like a red parent and a blue parent make a purple child or something or maybe (if I can find a way to do it) one with spots and one without have a chance for a little spots medium a lot or none so I am guessing this kind of stuff I would just need to make hundreds of different textures? or how does setPixel work?
It changes whatever pixel at x,y in the texture to whatever colour 
You could make a function that uses SetPixel to draw circles on your texture or anything else.
Just don’t do it every frame, and then find a way to save them or have it done procedurally so a seed always produces the same texture.
no I would do it once when they were created and create genetic traits that determine stripes spots etc. that would be great, thanks man