On Sun, Feb 28, 2010 at 7:58 PM, Ian Mallett
<geometrian@gmail.com> wrote:
Why not just add a vector to get translation? There is no need to go the homogeneous form. Or you can just leave the vectors at length 4 and use a slice to access the first three components. That way you can leave the ones in place.
Oh . . . duh :D
Excellent--and a 3D rotation matrix is 3x3--so the list can remain n*3. Now the question is how to apply a rotation matrix to the array of vec3?
It looks like you want something like
res = dot(vec, rot) + tran
You can avoid an extra copy being made by separating the parts
res = dot(vec, rot)
res += tran
where I've used arrays, not matrices. Note that the rotation matrix multiplies every vector in the array.
Chuck