I have a triangle (defined in 3D space) that has 3 points (p1, p2 and p3).
Is it possible to work out what the polarity of the surface normal would be for the face knowing it lists each point in an anti-clockwise direction going around the face on the same side that the surface normal should point?
Edit: "Polarity" might be a bad choice of word. By polarity I mean choice between $\vec{n} $ and $-\vec{n}$ where $\vec{n}$ is the surface normal.
Edit: Surely, the surface normal orientation can be calculated if you know the order of the coordinates?
Edit: OK, I have been thinking about what exactly I am asking... cause its not clear, I know.
So.... 1) I have a surface normal $\vec{n}.$ 2) I use the right hand rule to determine orientation... points (p1, p2, p3) go anti-clockwise around the triangle.
Q: Given 3 points of a triangle...and after calculating its normal. How can I tell which orientation I should use, please? It's giving me a real headache!