Calculates the cross product.


void cross_product_f(float x1, y1, z1, x2, y2, z2, *xout, *yout, *zout);
Calculates the cross product (x1, y1, z1) x (x2, y2, z2), storing the result in (*xout, *yout, *zout). The cross product is perpendicular to both of the input vectors, so it can be used to generate polygon normals.
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