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giugio

front back faces and shetchup

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hello.
Is possible to recognize if a face is a cw or if a face is ccw from normals and vertex or something?
How do the shader to recognizes front/back?
In cg for example the semantic FACE return <0 if a face is back and >0 if a face is front.
But how do that?
Because I'm tryng to import a sketchup file , but in some files is possible to have both front and back face inside the same model and i would flip all the front faces or all the back faces for create a correct cg shader front/back face .
thanks.

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