[Bf-python] quat multiplication

[models at paposo.com]

Thx willian you have a wealth of knowledge about this :)

----- Original Message ----- 
From: "Willian Padovani Germano" <wgermano at ig.com.br>
To: <bf-python at blender.org>
Sent: Friday, November 28, 2003 12:50 PM
Subject: Re: [Bf-python] quat multiplication


> Hi Joe,
> 
> > They look that way but check this out. I put the formulas into an
> > excel spreadsheet.  I think that blender's coordinates are rotated or
> > something:
> 
> You're forgetting to write the quat components in the right order for
> each convention: Cal3d uses q = (x,y,z,w), Blender uses q = (w,x,y,z).
> 
> If you want to compare the multiplication q1.q2 using Cal3d's and
> Blender's quat multiply code, you must write quat components in the
> right order for each:
> Cal3d multiply: use (x1, y1, z1, w1) . (x2, y2, z2, w2)
> Blender multiply: use (w1, x1, y1, z1) . (w2, x2, y2, z2)
> 
> --
> Willian, wgermano at ig.com.br
> 
> 
> 
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