Hi Eric,

Thanks for the reply. The reason it refers to texSkin instead of Entskin is because the screenshot was taken after I had grabbed Ventilators original code and insured that I was having the same problem with the original code. However, I get the exact same error using your shader_terrain.wdl. IOW, It's not your code that's broken, it's my environment somehow. I was just hoping that someone could tell me why the compiler was choking on the effect string. At least, that's what it looks like to me. ;-)

I am running the Commercial version 6.11.4 and should have no trouble with this. I have the action attached to the hmp and the compiler appears to be choking on a syntax error. But the code I am using is the code from your demo (or in this case Ventilators), copied into my working directory unmodified.

Any suggestions anyone?