Hello Gianluca,
I think, and I'm not exactly sure about it that if the matrix W
component (4th column) is zero, then the computation works with the 3x3
matrix. When it is different than zero, it uses it as 4x4 matrix. Now
supposed that startProj or endProj has in the 4th column zero, and the
other one has something different than zero, then all the animation
matrices will be 4x4 but the first or the last, and therefore the reason
on the discontinuity.
Check if that happens for any N and check if both matrices are 4x4 or
3x3. If one of them is 3x3 than set it's 4th component to one.
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of
Gianluca Natale
Sent: Wednesday, February 29, 2012 7:16 PM
To: Osg Users
Subject: [osg-users] animation from one projection type to the other one
Hi all,
I'm trying to implement an animation from a perspective projection to an
orthographic one.
What I'm computing at each step is a weighted linear combination of 2
projection matrices (the start, that refers to a perspective projection,
and the end, which is an orthographic projection).
So, supposing the whole animation in N steps, at step n my projection
matrix is defined by:
Proj(n) = startProjMat * (1 - n/N) + endProjMat * n/N.
The animation looks fine, but in the last step there is a noticeable
jump on the screen.
What did I go wrong?
Is there any unpredictable or invalid result in the linear combination I
computed, or is it a well defined projection matrix?
Thanks
Gianluca
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