Hi guys, I'm doing something wrong, but don't know what.

I want curvy deformation blur on my particle sim so I set the substeps on my popnet to 4. When I set my deformation samples to 4 on my mantra rop and render everything looks fine.

The problem comes when I cache the particles to disk. I set my increment value to 0.25 because I figure 4 substeps per frame is equal to a 0.25 increment. Mantra crashes. I've also tried a 0.2 increment on my rop with not luck.

What's up?

If it crashes, please always log a bug.

Does my setup sound correct, Edward? 0.25 = 4 substeps?

According to some colleges this is a know issue with Mantra.

To be honest, I'm not the right person to ask but if you set your deformation samples to 4 on the Mantra ROP, doesn't that mean it'll write out 4 samples to the IFD for each frame already? You can test this rendering few frames and see if the motion blur is what you expect? I'm not sure I follow the need to change the frame increment. And again, please submit your IFD if it crashes Mantra.