Particle recalculation problem

Hi,

I have changed some of the parameters related to the particles, but some frames doesn't recalculate. So I have to purge cache, then re-rendered from the first frame. I wasted a lot of time. Unfortunately "Re-render Current Frame" doesn't work.

FastNoise - pEmitter - pTurbulence - pRender - Merge3D - Renderer3D (OpenGL)

Has that ever happened to you?

Thank you.

You are not alone but unfortunately this sounds reasonably normal to me. If you change parameters that affect the entire particle flow, it makes sense that it would need to recalculate from the very beginning since all frames have now changed. Future frames are dependant on the previous ones and so you can not simply change a parameter and see the result without changing all previous frames.

I have also run into issues where the particle cache does not properly clear in these situations and you need to manually clear the entire cache and re-cache your simulation from the start.

I would recommend using few particles to start until you have the desired effect and then increasing the particle count to what you need.

You're very right about it potentially becoming time consuming and so you need to plan out your flow ahead of time as much as possible in order to minimize particle re-rendering.

Hope that helps a little! If anyone disagrees please do correct me.

Steph

Hi Hideki,
If your problem is reproducible please send a comp to support. It may be a bug and it helps a lot if the support/dev team has something in their hands.

This happens a lot to me. Ever since the particles were changed when the particle fuses were depricated. Random frames get "stuck" in the cache and you get temporal discontinuities. Instead of evaluating the entire timeline, as you would expect, it only recalculates a range. I have to manually clear the cache to fix it.

Thank you for your responses.

I opened a comp include particles. I hit a space bar. But result was strange.
Purge cache didn't help. I disconnected each nodes then re-connect. Result became fine.

When I changed the nodes other than the particle node, I don't really know why, but Particles start re-calculation. Then result was strange.

I don't know the reproducibility. Because It is a whim very. So I can't report this to BM.

Reproducibility is nigh impossible. The comps are certainly worthless, need to figure out what the cause is independently from the .comp file.