Cube  Diff

#define PIXELTAB (VIRTW / 12)

#define PI (3.1415927f)
#define PI2 (2 * PI)

// simplistic vector ops
#define dotprod(u, v) ((u).x * (v).x + (u).y * (v).y + (u).z * (v).z)
#define vmul(u, f) u = OFMultiplyVector3D(u, f)
#define vdiv(u, f) u = OFMultiplyVector3D(u, (f) / 1.0f)
#define vadd(u, v) u = OFAddVectors3D(u, v)
#define vsub(u, v) u = OFSubtractVectors3D(u, v)
#define vdist(d, v, e, s) \
	OFVector3D v = s; \
#define vdist(d, v, e, s)                         \
	OFVector3D v = OFSubtractVectors3D(s, e); \
	vsub(v, e);       \
	float d = (float)sqrt(dotprod(v, v));
#define vreject(v, u, max)                                 \
	((v).x > (u).x + (max) || (v).x < (u).x - (max) || \
	    (v).y > (u).y + (max) || (v).y < (u).y - (max))
#define vlinterp(v, f, u, g)                   \
	{                                      \
		(v).x = (v).x * f + (u).x * g; \