rocket exercise - particle system issue

Hey all, 


So I've done the rocket tutorial and used cycles with nodes for the exhaust animation and it is working fine in the timeline on preview mode, but when I render it somehow i've got a few frames where the velocity of the exhaust seem to revert.  I checked, those values are not keyframed (only the lifetime is.).

Also there is some jittering at start of the animation.


Not  sure how I can troubleshoot this as in the viewport it works perfectly.  Any idea?

Thanks!


Séb

  • adrian replied

    Hi slenaerts ,

    Sounds like the velocity setting is maybe 1 instead of -1. You may only notice it on the first couple of frames.

    Have you baked the particle system? 

    If you have, with the smoke emitter selected , go to the particle settings and under cache click delete bake.

    Now go to velocity and check that the normal is -1 and object is -1. Double check your keyframes, none before frame 120.

    Now go back to the cache and click bake.

    And now try rendering again.

  • Sébastien Lenaerts(slenaerts) replied

    I will try again, thanks for the troubleshooting steps! Will let you know.

    Cheers



  • Sébastien Lenaerts(slenaerts) replied

    @adrian2301 Your tips did help me out, somewhere it did cache a jump in velocity that I probably changed with the keyframe recording on without me realizing it.  Thanks again! My rocket is finally flying :)