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Mocha OFX in Fusion 9 slow renders

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Mark Sterne

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Mocha OFX in Fusion 9 slow renders

PostMon Aug 13, 2018 2:57 am

I have a 23.98 UHD comp with 2 DNxHR HQX sources. This is 2-up interview where I am using the actress on the left from one source (take) and the actor on the right from the second source. There is a polygon mask on the foreground node with minimal animation dividing the screen.

I have used Mocha's remove on the background node to remove her hand where it passes in front of the actor on the right.

  • The result is good but it takes about 45 seconds to render each frame!
  • I rendered the effect in Mocha but when I go back into Fusion, it still takes 45 seconds to render each frame.

I am not greatly experienced with either program so I may have missed some settings that would help.

  • How should I be caching?
  • Is this a case where I should be disabling Open CL? My GPUs are 2 x 1080ti.
  • Anything that could speed up the render times?

My system:

Fusion Studio 9.0.2
Mocha Pro OFX plugin 5.6

Win 10 Pro 1709 build 16299.547
ASUS X99 Deluxe II
Xeon E5-2696 v4 2.2 GHz
64GB RAM
2 x 1080Ti

Thank you for any help and let me know if I can provide more information that would help.
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Bryan Ray

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Re: Mocha OFX in Fusion 9 slow renders

PostMon Aug 13, 2018 2:50 pm

I'm not entirely sure how the OFX plug-in operates, but I'd guess that you need to bring in a new Loader with the rendered output from Mocha and replace the connection from the Mocha node. If that doesn't work, then prerender the output of the Mocha node with a regular Fusion Saver.
Bryan Ray
http://www.bryanray.name
http://www.musevfx.com
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Juha Takabe

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Re: Mocha OFX in Fusion 9 slow renders

PostMon Aug 13, 2018 5:19 pm

I would prerender it.
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Mark Sterne

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Re: Mocha OFX in Fusion 9 slow renders

PostMon Aug 13, 2018 7:34 pm

Thank you both.

I'll try prerendering and see how that goes.
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Rajiv Mudgal

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Re: Mocha OFX in Fusion 9 slow renders

PostTue Aug 14, 2018 3:40 pm

My experience is the same. I often times export DPX from Fusion to Vegas as Mocha transfers in Vegas are fast.
The other thing you can try doing is exporting from mocha fusion comp files. or simply copy paste Fusion shape data as shown here


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Bryan Ray

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Re: Mocha OFX in Fusion 9 slow renders

PostTue Aug 14, 2018 6:15 pm

Heads up: Depending on your configuration, shapes in Mocha may be temporally offset in Fusion. Double check in the Timeline View that the first keyframe lines up with the first frame of your shot.
Bryan Ray
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http://www.musevfx.com

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