1.6.11: Fix the incorrectly computed normal
The normal should take into account all of the points, not just the first 3. the change allows for polygons whs first 3 points may in fact be in a line producing an invalid normal
The normal should take into account all of the points, not just the first 3. the change allows for polygons whs first 3 points may in fact be in a line producing an invalid normal