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On 16/03/2005 at 07:53, xxxxxxxx wrote:
Cinema 4D Version: 9.1
Platform: Windows ; Mac ; Mac OSX ;
Language(s) : C++ ;
I have a problem. I get the normal of a polygon with CalcFaceNormal(). Then I construct a rotation matrix out of it and set it to an object to align it to that normal.
Works fine so far, but the normal gives me headaches. If I rotate the polygon around 1 axis, the whole normal changes (so all 3 components), which means the constructed matrix has rotations in other axis too, which results in the object to rotate around other axis although the normal has only been rotated around 1 axis.
Anybody knows how to solve this? Any ideas?
Thank you very much!
On 17/03/2005 at 11:45, xxxxxxxx wrote:
you need to construct your matrix with an upvector. if you need your object to stick to the surface then you could try using !(padr[vadr]-padr[vadr]) as your upvector, this will ensure (provided the winding doesn't change) that you have a constant relative upvector
then just construct your matrix as follows:
(you might wanna do cross products on the other two afterwards just to make sure that the matrix is orthogonal)
On 17/03/2005 at 11:48, xxxxxxxx wrote:
Ah! Good idea with using the points as upvector! (why didn´t I think of this?
The matrix construction is clear.