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direction of surface normals??

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hi, i'm new to graphics programming. i'm doing a project on rotating a 3d cube. and i need to remove the hidden surfaces. as i know that the simplest method is to calculate the vector normal to a surface and then doing a dot product with the center of projection point. my problem is i cannot currectly visualize the direction of the surface normal although some tutorials suggested to do it using the right hand rule. is there any other method ?? magneeto

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