[PD] GEM:discribe position of model with 2 points

[Falk Grieffenhagen.de]

Hi IOannes,

Yes...this is how it works, thanks a lot

Gruss

Falk
Am 30.11.2005 um 17:53 schrieb IOhannes m zmoelnig:

> Falk Grieffenhagen.de wrote:
>> Hi list,
>> I currently have a little math problem:
>> I have a wavefront model (see below) which looks a bit like a stick. 
>> I want to set the position by 2 points in 3D (beginning and end) 
>> instead of one point,  rotation , and scale.
>> Any help would be great!!
>
> i would do that in 2 steps:
> #1: normalize your stick (set length to 1.0, align it to an axis)
> #2: align the normalized stick to your 2 points
>
> i demonstrated #1 in the attached patch. now the base of the stick is 
> within the origin of the local coordinate system, while the tip is at 
> (1/0/0).
> now #2 should be fairly simple: [translate] the stick to 1 point and 
> rotate/scale it so that the 2nd point matches the end of the stick. 
> the procedure is in fact the reverse of #1 (but the reference points 
> have changed)
>
> mfg.adsr.
> IOhannes
>
>