From: Guillaume Smietanski (gsmietan++at++fmr.tu-darmstadt.de)
Date: 04/20/2001 06:48:11
Hello Performer Developper,
I have a question about shearing matrix. We devellop stereo Displays
with for one an Orhtogonal Projection. To have a stereo depiction we
have to solution one is to translate and rotate the picture depending of
parallaxe and the stereo effect we want. The Problem is that the picture
is not really correct for the borders. The second one is to use a shear
transformation with an matrix (with homogene coordinate) like:
1 sh 0 0
0 1 0 0
0 0 1 0
0 0 0 1
This is possible with Open GL but it seams that it should not be
possible with Performer: in the manual page of the pfChannel::setViewMat
I can read that the "mat[rix] must be orthonormal or results are
undefined". I am not really a mathematic specialist but if I don't make
any mistake a shearing is not an orthonormal transformation. The pfDCS
manual page confirm my opninon: I read about setMat that shearing is not
allowed.
Have you any experience whith shearing transformation ? If how did you
do compute the transformation ?
Thank you a lot for any remarks.
Guillaume Smietanski.
This archive was generated by hypermail 2b29 : Fri Apr 20 2001 - 06:48:56 PDT