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rendering issue in 11.5
Hi, I’m trying to find out the reason of render speed discrepancy between a perspective camera and an orthogonal view in cinema this is my test file:
https://www.cubicdesign.fr/drew/rendertimeproblem.rar
In the perceptive view I’ve dollyed a camera far enough and then zoomed in to imitate cinema’s Top view.
the thing is, a perspective camera renders much faster then the Top view when sent to the “picture viewer”(do not render “active view”, alternately set each panel to be used as render view).
Just note the render time in the picture viewer for the first half irradiance cache prepass to go down (for the little squares to reach the bottom)
the results I have:
a dual intel core: left (perspective) panel 2:03mns, right (top) 4:44mns
a quad intel core: left panel 1:16mns, right 3:14mns
Any idea how to get the same render speed from an orthogonal view? this is crucial for archvis and product presentation.
Note: substituting a parallel camera yield no speed gains.thanks, Lh
What?
cubicdesign.fr
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3 Replies
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I’m not sure what the cause is, but I suspect it has to do with the way that rays are cast from the camera. Perhaps shooting rays parallel from an orthographic camera plays havoc with the scattering algorithm.
That said, the total rendering time (albeit at 1/10th scale) was about the same for both views.
I will offer you this tip, though: in 11.5 there is now a
small fragments option in the antialiasing tab where you can chooseo choose between hybrid, raytrace only, and scanline only. In scenes like this with very high per pixel detail, the raytrace only option can provide a significant speed up. In my 1/10th scale test it produced a 33% improvement. -
Thanks Adam for looking into the issue, I will try the small fragments option. couple days ago a top view render took 7.5 hours completely throwing off all schedule for a job. The perspective camera finished in 20mns, that is a huge delta making orthogonal views and parallel camera useless for some scene configuration.
What?
cubicdesign.fr
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Yeah, sorry I couldn’t be of more help. You should probably submit it to Maxon tech support so they can sort out whether it’s a bug or a limitation.
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