given two vectors u = (u_x, u_y, u_z)
and v = (v_x, v_y, v_z)
u x v = n <-- the normal vector
n_x = (u_y * v_z) - (u_z * v_y)
n_y = (u_x * v_z) - (u_z * v_x)
n_z = (u_x * v_y) - (u_y * v_x)
where n = (n_x, n_y, n_z)
There's the equation. Hopefully I got that right.
Khawk
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I edited the post since some of it was missing because the board thought I was doing html.
[This message has been edited by Khawk (edited August 10, 1999).]
N.x = (U.y * V.z) - (U.z * V.y)
N.y = (U.z * V.x) - (U.x * V.z)
N.z = (U.x * V.y) - (U.y * V.x)
The second answer given is the "proper maths" way to do it, but the first answer given is actually the most widely used in graphics programming.
Fool.
I was using the Microsoft writtine function CalculateNormals() which comes with the XFile example on the SDK CD. It's good, but not good enough.
Anyone else have any better ideas?
Thanks.
-Snowman
Sengir
