Re: [eigen] geometry module... |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] geometry module...*From*: Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>*Date*: Fri, 19 Mar 2010 20:01:43 +0100*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=rA3a2S+0nv6itdr92yd/lmPse66nJH2UzyBCNIo8tLU=; b=e3qJ6FNnxSy4B0oZlVd6mGO+dVR0XmgOd8KJZJgBig7hFIpWeaHld67eOEh1ZMMlKs +R1bLbe/11x9PrFSChnMmfZoiI9mpk+bT8LkDw7vG1hA0oPAS53Ox92lbzRJzCwEjoOa DNe9DLipQmlwwwX9EWW8vqsTS86fC5WQCKS7g=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=KZvoKQNo0QBry8iUsmBrMCYQCFH9dSB9KQ3lEzS/lTlw4k4noKzW84n4Ozp2c6c4nw UgsF0DIcvypLeMPsB5K2Hu/XIiafzZ0vD8XZPi3TNgVMi+bxshQIVy2eRNjqiloeSDZB tDdCs0dZgSX5X1jlqK/BhvILx7XdFikoxyPvQ=

On Fri, Mar 19, 2010 at 7:44 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote: >> - make UniformScale * Translation return a Translation > > I don't understand that. UniformScale * Translation should return the > composite transformation, that consists in first translating and then > scaling. This is not a translation! Well, maybe the bigger problem is that we do not yet have expressions in the transformation chain. A translation is not even a transformation but it behaves as such since Vector = Translation * Vector is a valid operation - i.e. translations behaves like a transformation matrices. And given Vector = Scaling * Translation * Vector which can be written as Vector = (Scaling * Translation) * Vector = OtherTranslation * Vector I considered returning a translation - in particular since Translation * Vector is way more efficient than ProjectiveTransformation * Vector. Maybe now I managed to maximize confusion but I agree that such a trivial fix is not really a fix and thus I will leave it alone for the moment. - Hauke

**Follow-Ups**:**Re: [eigen] geometry module...***From:*Benoit Jacob

**References**:**[eigen] geometry module...***From:*Hauke Heibel

**Re: [eigen] geometry module...***From:*Benoit Jacob

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