In order to understand blender python game scripting, I currently try to build a scene in which one can walk around a sphere, using the FPSController structure from [this link][1]. For gravity and FPSController orientation I tried to construct a python Controller, which currently looks like this:

    def main():
        print(&quot;Started&quot;)
    
        controller = bge.logic.getCurrentController()
        me = controller.owner
        
        distance, loc, glob = me.getVectTo((0,0,0))

        grav = controller.actuators[&#39;Gravity&#39;]
         
        strength = me[&#39;Gravity&#39;]
        force = strength*(distance*distance)*glob
        
        grav.force = force
        
        try:
            rot = Vector((0,0,-1)).rotation_difference(glob).to_matrix()
        except Exception as E:
            print(E)
            rot = (0,0,0)
        
        rotZ = me.orientation
        me.orientation = rot*rotZ

        controller.activate(grav)

    main()

which roughly works until any angle goes over 180 degrees, and looks discontinuous then. I assume this comes from rotation_difference being discontinuous – [blender documentation on Math Types &amp; Utilities][2] does not say anything, and I have not thought enough about quaternionic representations yet to see if a continuous map would be possible – and I guess there is a more elegant way to achieve that the local Z orientation is continuously mouse-dependent, while local X and Y orientations depend continuously on some given vector, but how?


  [1]: http://blender.pellej.com/bge/FPSController.blend
  [2]: http://www.blender.org/documentation/blender_python_api_2_63_17/mathutils.html

Blender: Walk around sphere

I need to resize and rotate certain elements in SVG document using javascript. The problem is, by default, it always applies the transform around the origin at `(0, 0)` – top left.

How can I re-define this transform anchor point?

I tried using the `transform-origin` attribute, but it does not affect anything. 

This is how I did it:

    svg.getDocumentById(&#39;someId&#39;).setAttribute(&#39;transform-origin&#39;, &#39;75 240&#39;);

It does not seem to set the pivotal point to the point I specified although I can see in Firefox that the attribute is correctly set. I tried things like `center bottom` and `50% 100%` with and without parenthesis. Nothing worked so far.

Can anyone help?


All Coordinate Transformation Solutions on Gang of Coders

Total of 2 Coordinate Transformation Solutions

Blender: Walk around sphere

How to set transform origin in SVG