Hi Antonio,
On Tue, 2006-02-28 at 20:19 +0100, antonio_lioy wrote:
>
> Wow, I suppose that this is the solution to most of
> my troubles, but I cannot get it very well.
> Naming Mh the matrix that rapresents the hand in world
> space, and Mobj the matrix that rapresents the object
> picked in world space in the moment of picking
> I suppose from what you told me to save
> Msave=Mh*inv(Mobj)
> in the moment of picking and to compute the new position
> of the object as Mhn*Msave where Mhn is the new position
> of the hand. Well, I tried those formulas but It doesn't
> work, cause I get random position when I picked something
> Maybe I missed something but I want to have understood
> the math. Shouldn't the relative position be
> Msave=inv(Mh)*Mobj???
Matrices are always from object to world space and the points are
applied on the right, so to get from hand to picked obj space you need
Msave = inv(Mobj) * Mh.
Hope it helps
Dirk
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