F4.15.6} Movie Editor Tool

 This tool can export a series of images to create a movie of the
 geometry. All frames are controlled by the local variable "frame"
 Any geometrical body, object and in general any card and/or layer
 parameters can be entered parametrically as a function of the
 "frame" variable
        e.g.

        * Move the camera object on a circular motion with a radius
        * of 50 and each frame is moved by 1degree.
        camera  x: = 50*cosd(frame)
                y: = 50*sind(frame)

        * create a sphere that is exploding in radius
        SPH sphere 0 0 0 =frame+1

        * move along a spline path
        camera  x: = spline('camera_pos',frame).x
                y: = spline('camera_pos',frame).y
                z: = spline('camera_pos',frame).z

        spline name: camera_pos
        *       node#    x  y  z  frame
                node00:  0  0  0    0
                node01:  0  0 10  100
                node02: 20  0 20  200
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