Function CM_PlaneFromPoints

code/qcommon/cm_patch.cpp:153–165

===================== CM_PlaneFromPoints Returns false if the triangle is degenrate. The normal will point out of the clock for clockwise ordered points ===================== */

=====================
*/
static qboolean CM_PlaneFromPoints( vec4_t plane, vec3_t a, vec3_t b, vec3_t c ) {
	vec3_t	d1, d2;

	VectorSubtract( b, a, d1 );
	VectorSubtract( c, a, d2 );
	CrossProduct( d2, d1, plane );
	if ( VectorNormalize( plane ) == 0 ) {
		return qfalse;
	}

	plane[3] = DotProduct( a, plane );
	return qtrue;
}


/*