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 Tutorials » 3D
Looping Keyframes (cont.) This is the PARAMETER CURVE OUT-OF-RANGE TYPES button. What does that mean? Basically it's just a tool that tells MAX what to do once it runs out of keyframes during the course of the animation. Press it and it will bring up the following menu: 
At the moment, it's set to CONSTANT, which means that it starts at the beginning, and ends at the end. That's it. We really want the planets to loop repeatedly around their orbits, smoothly connecting the start to the end. So we click on LOOP. There are other options there, like PING-PONG which will move forwards, then backwards between start and end keyframes. Or CYCLE, which will go through a series of keyframes, and jump back to the beginning without a smooth transition. Click on LOOP, and press OK. Minimise the track viewer, and press play on the controls. Now you should see the first planet continue to revolve around the sun all the way through the animation, instead of stopping dead at frame 40. Maximise your track viewer, and go through each sphere (all planets and moons), and change the percent to a LOOP out-of-range curve type. Once we've done that, We're pretty much finished! You can use this same technique on out-of-range curve types on helicopter blades, wheels on a moving car, or any sort of animation where repetitive motion is required. Electric fans, you name it.
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3D Solar System of Rotating Planets and Moons
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