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The frame rate of an animation is expressed in frames per second (FPS). This is the number of frames the software displays and renders for every second of real time.
Because the program stores your animation keys using real time using an internal precision of 1/4800 of a second, you can change the frame rate for your animation at any time without affecting your animation timing.
For example, if you create three seconds of animation using the NTSC video frame rate of 30 FPS, you will have a 90-frame animation. If you later discover you need to output to PAL video, at 25 frames per second, you can switch to the PAL frame rate, and your animation is now set to 75 frames of output. No change in the timing of your animation has occurred. Only the number of frames that 3ds max will display and render has changed.
You use the settings in the Time Configuration dialog > Frame Rate group to switch back and forth between frame rates at any time.
NTSC: U.S. and Japanese video standard of about 30 frames per second.
PAL: European video standard of 25 frames per second.
Film: Movie standard of 24 frames per second.
Custom: Frame rate set in the FPS parameter.
You use settings in the Time Configuration dialog > Playback group to specify the playback speed, and the number of viewports that play the animation.
Real Time: Animation plays at the selected playback speed, skipping frames, if necessary, to maintain the correct speed. Turn this off and the animation will play every frame without trying to maintain the correct speed. The different playback speeds are also useful when using the Motion Capture utility.
Active Viewport Only: Animation plays only in the active viewport. Turn this off and the animation will play in all four viewports at once.
Speed: Select one of these options to multiply the frame rate by the selected speed.
Direction: When Real Time is turned off you have the option to change the direction of the animation playback. Choosing Reverse will play the animation from end to start. Choosing Pingpong will play the animation from start to end, then end to start
Loop: When Loop is turned off, the animation will play once and stop.
The ability of the program to play your animation at a specified rate depends on many things, including the complexity of the scene, the number of objects moving in the scene, the geometry display mode, and so on. The worst case is a camera move in shaded mode, in which the viewport is filled with detailed geometry. In such cases, it’s best to simplify the viewport display, using either wireframe display or, in extreme cases, box display mode.
Naturally, it takes more computing power to display your animation in four viewports, and playback smoothness is reduced. When Active Viewport Only is selected, you can switch active viewports during playback either by clicking the label of an inactive viewport, or by right-clicking in an inactive viewport.
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