Re: [Visualpython-users] Rotated frame relative coordinates

[Bruce S. <Bru...@nc...>]

I agree that we need ways to move between frame and scene coordinates. I 
too have tripped over these missing links.

Moving from frame to frame seems to me a rather different and more 
complex issue.

Bruce Sherwood

Ron Adam wrote:
> I want to add a vector in world relative coordinates to objects in a 
> rotated frame.  It first needs to be translated to frame coordinates.
>
> I can do this for single axis, but when the frame rotation involves 
> rotation of more than one axis, I can't seem to get it correct.
>
>
> It would be nice to have these three functions ...
>
>
>      # The current world_space_function.
>
>      def frame_to_world_pos(pos, frame):
>          """ Frame position in world space coordinates. """
>          x_axis = norm(frame.axis)
>          z_axis = norm(cross(frame.axis, frame.up))
>          y_axis = norm(cross(z_axis, x_axis))
>          return frame.pos+pos.x*x_axis+pos.y*y_axis+pos.z*z_axis
>
>
>      def world_to_frame_pos(pos, frame):
>          """ World position in frame space coordinates. """
>          ???
>          return frame_pos
>
>
>      def frame_to_frame_pos(pos, frame1, frame2):
>          """ Frame position in other frame space coordinates. """
>          wpos = frame_to_world_pos(pos, frame1)
>          return world_to_frame_pos(wpos, frame2)
>
>
> Is there an easy way to move objects from frame to frame and keep their 
> orientation relative to world space?
>
>
> Thanks, Ron
>
>
>
>
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