Re: [Visualpython-users] obtaining pos in world co-ordinates of a frame obj

[Bruce S. <bas...@un...>]

I've added Jonathan's routine to the on-line documentation for "frame" 
and also updated the Doc zip file that can be downloaded. Thanks, Jonathan.

This does leave open the question however as to whether there ought not 
be a method in Visual for resolving pos and axis information. In 
particular, I believe that even Jonathan's routine isn't really complete 
if this frame is inside another frame: one should really recurse up the 
enclosing frames.

Bruce Sherwood

Jonathan Brandmeyer wrote:

> Let me amend that routine.  You also have to normalize the y_axis vector
> (smacks self on head).
> 
> def world_space_pos( frame, local):
>     """Returns the position of local in world space."""
>     x_axis = norm(frame.axis)
>     z_axis = norm(cross(frame.axis, frame.up))
>     y_axis = norm(cross(z_axis, x_axis))
>     return frame.pos + local.x*x_axis + local.y*y_axis + local.z*z_axis