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OpenGL The Problem with MatrixTransform

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I use COIN3D to do something. But recently I got a problem. I expect to show a rectangle's two sides. I set white color to the rectangle and made it two show the two sides, now I got a two sides white rectangle. But when I set a Matrixtransform. Actually I set that in an ivFile: Separator{Matrix {1 0 0 0 0 -1 0 0 0 0 1 0 12 3 5 1} File {"rect.iv"}} The result is both of the two sides became black. Now I want to ask that whether there is a similar problem in OpenGL, and is there any simple way to solve the problem?

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