Make new material bug? (python)

@Holo wrote:

Hi guys, I am making a material with Python but I encounter a bug where Rhino removes the previous made material if I change the “NAME” in the script. It appears to make a new material OK, with a new index and all, but where is the old one?

import rhinoscriptsyntax as rs
import scriptcontext
import random

### --- Make Material
newMatIndex = scriptcontext.doc.Materials.Add()
print "newMatIndex= "+str(newMatIndex)
rs.MaterialName(newMatIndex, str(int(100000*random.random() )))
color =(int(random.random()*250),int(random.random()*250),int(random.random()*250) )
rs.MaterialColor(newMatIndex,  color)
print "MaterialName= "+str(rs.MaterialName(newMatIndex))
scriptcontext.doc.Materials.Add()

This is just a modified and simplified script to illustrate the problem.
My real big problem is that I generate a gradient PNG and assign this in a larger script, and when I run the script the second time the material turns black, I presume some bug is going on internally in Rhino’s material handling and I can not seem to find a workaround. Because IF I make a new material in Rhino’s material editor and name that “NAME” too, then that is fine, but if I do it one more time then I get an error message saying that the name is already in use. (But now I already have two materials named the same… odd)

Also if I delete the generated material in the material library then I can run the script again.
But if I autogeneate names with random then the old materials just disappear…

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