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Softimage Xsi: a quesion about Detection Threshold! help!

Posted: March 29, 2007
there days i learn about Toon shader

i found Detection Threshold parameter.

i have read the help about this parameter.

and try to adjust this parameter value from 0 to 1

but i still dont find any change in the render region!

can you tell me how to use it?

thanks alot!