Hi Allen,
the problem with setMatrix is that it cannot fully encapsulate the state
of the manipulator. Internally the manipulator (trackball) uses a
distance, rotation and center, but all these variables do not fit into a
matrix. The manipulator can calc a matrix from the internal variables,
but not set them properly from an input matrix. E.g. the view might look
OK, but the rotation point is somewhere weird.
Some pointers to the past:
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/8588/focus=8612
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/19271/focus=19873
jp
Allen Saucier wrote:
Hi,
thanks JP! :) I really appreciate your response. It appears I am fighting
something I didn't expect and something I don't fully understand: the terrain
manipulator.
I understand what you've proposed but when I call the fucntion: setByMatrix()
w/in the terrain manipulator, that function appears to be doing something to
the matrix I send in that I am not expecting.
What you've proposed is pretty much what I do except that I'm using quaternions
and then converting those quats into matrices.
So I can move the cam and I can even rotate it on the "Z" axis which is the position
vector coming from the ECEF origin to the point on the terrain I'm working with and the cam is
looking directly down that "Z" axis (local z-axis).
It's just when I do a 90 degree rotation about the local x or y axis I get
something totally screwed up and I don't know why but I think the mystery is
w/in the terrain manipulator which I've not investigated more thoroughly as yet.
I am hoping someone who has in depth knowledge about the terrain manipulator will
see this post & buzz me back on it. I have very limited understanding of the
manipulator code w/in OSG as I'm still a novice w/ OSG so I get all mixed up when I
delve into any of the manipulator classes: trackball, nodetracker and now terrain.
thanks though!
Thank you!
Cheers,
Allen
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=25590#25590
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