[Rd] rgl rotations
djsamperi at gmail.com
Thu Apr 17 19:56:22 CEST 2014
Is there a way to change the viewpoint using view3d (or rgl.viewpoint)
with respect to
the image that currently appears rather than the perspective that rgl
thinks is the
default? For example, if I create an image and then perform what
should be a no-op:
the image is rotated. Then I can perform rotations on the result
But I want to specify rotation with respect to the image as it
or with respect to the viewpoint that is currently in effect.
Experimentation has revealed that when using rotationMatrix the z-axis
of the canvas instead of pointing up as it often is in mathematics,
using the spherical coordinates (theta,phi).
I guess the question is: can we query rgl for the current viewpoint and then
apply changes to that? Another way of putting it is: can we do programmatically
what we can easily do using the mouse in interactive mode?
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