...is to have a particle-trail-tail continue infinitely, despite having a "Frame Start / Frame End" property in the Particle System tab, rather than using keyframe animation.
My animation is a model of the solar system, where the planets are constrained to curves, and emit a particle trail which conforms to the same curve.
My Setup So Far
- The orbital paths are curves.
- The planets are empties, using Object Constraint, targeted to the orbit-curves.
- A UV sphere is parented to each empty as the planet object.
- A plane is parented to the empty as the (trail) emitter object.
- The orbit animations are keyframed on 1 and 360 as the curve offset percentage, and then set to linear extrapolation in the graph editor.
- The particle trails have "Frame Start / End" properties, which are not animatable properties, rather than something that I know how to keyframe.
The animation above is frames 264 - 456. The extrapolated curve motion continues past frame 360, but the frame-coded particle emitter does not.
I thought I would use linear extrapolation like I did for the orbits themselves, but I cannot seem to figure it out.
I'm looking for a way to make the trails continue indefinitely, regardless of how many frames the ending animation turns out to be.
Additional Potentially Useful Screenshots
My object organization and hierarchy:
My particle emission settings:
My trail shrink is a texture blend, using a ColorRamp from white to black. The Influence is set to Size. The Mapping is set to Strand/Particle: