Panda3D Manual: Motion Path and Particle Intervals
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Motion paths are an advanced feature of Panda3D, and they are discussed later. Still, motion paths have their own intervals. A motion path interval is much like a function interval in that there are no additional parameters other than the motion path and the NodePath it is affecting.

intervalName = MopathInterval(<Motion Path Name>,NodePath,‘<Name>’)

Particle effects can be run from inside intervals as well:

intervalName = ParticleInterval(
    <Particle Effect Name>,
    <Parent>,
    worldRelative = 1,
    loop = 0 or 1,
    duration = myDuration
)

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