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How do you deal with geometry sequence that is saved with substeps (x substeps per frame)


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I have a geometry sequence that has substeps (saved as x number of substeps per frame). Would you have a standalone lops network graph or even a stand alone hip file just for that animated geometry with enable playback at fractional frames? or would you just mix it with other assets and simulations caches that are not saved with substeps? and if you mix it do you then enable playback at fractional frames? and if you do enable the fractional frames would that impact the other non substep elements during rendering?

 

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First youy need to understand why you need substeps. In 99.9% of cases you dont, and if you save caches with substeps you can use usual timeline. Houdini get access to subframes in simulations or when you retime youe caches.

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I'm trying to reproduce a similar motion blur quality as they did in Dune:

Screenshot2026-01-11112429.thumb.jpg.98b87bba81dddefdb749e64d57d70ec4.jpg

Here is the exact timing in the video: 

 

 

His first answer is a lot of rendering, but then How, and how to composite it?

I can only use the subframes when the "Enable Playback at fractional frames" is active

Screenshot2026-01-11113015.jpg.c64cec91ea1165080d3268523d2e37f7.jpg

 

Everything else in my scene is not using any substeps. I do understand one way is to render the asset with motion blur separately, what do I get? exrs with subframes or just frames? if just frames what was the point of subframing, if with subframes what do I do with the subframes in compositing with the other exrs that only have frames? and when I export the composited thing, is it with frames only or subframes.

Human knowledge is cumulative, once this level of motion blur quality is achieved in Dune, what used to be 0.01% of the cases has now become the new starting point for motion blur, at least for me.

Edited by Coz_y_not
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