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Stamping texture mapping


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I am trying to modify a texture map using a stamp command on the material override and it is not seeming to stamp.  What am I missing?  Here is my expression

$HIP/4kTexture.`stamp("../StampBoxes", "ptnum", 0)+1`.png

It successfully imports one texture, but it does not increment the value in the stamp.  If I break that in any way, the whole texture breaks so it is "working", just not stamping off 0.  Even if I use a different default value, the output of the stamp command is always 0.  I am just using $PT in the value for ptnum on the copy stamp node. The scene is around 200 boxes, each pulling a separate texture.  

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