Vitus
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Just for giggle and grins, I once animated what would normally require 100 frames to use only 4* frames. It still worked perfectly! So yes, the sim will interpolate the keyframes.
Actually, I suspect one could get away with only 2 frames, but I didn't try it out.
*NB: 4 frames because of the need to have intermediate keys:
0 = 0
1 = 25
2 = 50
3 = 75
4 = 100
Yes, that's what I thought as well. I didn't go through the rigorous testing as you did, but always had a hunch that it was silly to add more keyframes for "smoothness". I usually set the animationlength to a value that makes the math easy. E.g. if the range of a gauge i 0 to 42, I'd go with an animation length of 42, no math needed.
Yes! That's the only thing that can really screw things up. I usually have KFs every 90 degrees to prevent any issues.Any time I have a rotation > 150°, I always add intermediate frames.

