Fwd: [qwtplot3d - General] Rotation (and Translation and Scaling)

[Micha B. <kri...@us...>]

Hi all,

nice to hear about porting to Qt4. I would like bring an old message
from Todd Keith to your attention. Afterwards, Todd provided a patched
version of the then actual library (0.2.4 beta) to me. Are you still
interested in these features? Let me know if, and in this case how to
provide them (some tarball, zip or whatever to one of you might be the
simplest way).

Micha


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Read and respond to this message at: 
https://sourceforge.net/forum/message.php?msg_id=2884389
By: takeith

FTF:  Excellent Library!  Thanks to the developer(s)!

Unless I missed something, rotation (and translation and scaling) in qwtplot3d
can currently only be done in model space, whereas it is often desirable to
do such transformations in view (screen) space, and also possibly using an arcball
rotation control.  For example, if I move the mouse along the X axis, I might
want the model to rotate around the screen y axis or translate along the screen
x-axis, not rotate around the the model Y axis or translate along the model
X axis.  Using quaternion-based transformation control, all of this can be achieved
cleanly and consistently.  I have modified qwtplot3d along these lines and would
be glad to have the changes incorporated into the qwtplot3d library ...

Also, I added the ability to select grid nodes / suface polygons, with the mouse
using OpenGL's selection mechanism and emit a signal indicating such a selection
has been made.  This may also be of general interest.

What is the preferred way for me to merge my changes into the official qwtplot3d
library, assuming of course you are interested?

Thanks again!
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