I finally figured-out MathMap Animated Spheres.
Unfortunately PhotoComix tutorial on MathMap didn't cover animation.
http://gimpchat.com/viewtopic.php?f=23&t=4931Here are the Settings I used:
These are the User Values I used:
Because MathMap is all maths, a horizontally rotating sphere only uses the 'Y axis'.
(Thats a vertical line between the poles) Forget the X values in this example.
For '
Rotate Y_Start' I used 0.
For '
Add_RotateY' I used 180. (that's in degrees and half of 360 degrees)
For '
Multiply_Y' I used 2. (This is closely linked to 'Add_RotateY' because 2 X 180=360 which is what is needed)
There would be many other combinations for the linked Y values but I'm a newbie at MathMap.
I used 72 frames in the settings box so each frame is 5 degrees. 90 frames is 4 degrees per frame. I don't know what 'Periodic' does here and 'Rotate' doesn't need to be ticked. PhotoComix says 'Reflect' is the best edge behaviour so I used that. He also recommends 'Supersampling'.
Above is the GIF.
Looped webm video is here:
https://gfycat.com/FreeFelineGalapagospenguinNotes.
Don't forget to check your animation with Filters>Animation>Playback.
The first and last frames of the MathMap Sphere animation are the same. Delete one of them.
When finished choose an export option.
You can export as GIF or if you have Gimp GAP installed you can export as an unlooped AVI video.
The big question for me is 'what is the successor to animated GIFs'? Needs further investigation.