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Old 03-12-11, 23:31   #1
 
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Default Tips for faster C4D renders


Everyone could do with faster render times. So here are some tips and tricks I picked up over the years.

We'll first see how long a small, but complicated scene takes to render with default render settings, using GI, AO and Best Anti-aliasing.

The scene I'm using features pretty much everything, silly polygon count(1,716,024 polys), lots of reflection(every surface has some reflection, most are blurry), refraction(helicopter glass, hangar windows), lot's of shadows(all area shadowing), multiple lightsources, translucent glass with 8xAA, etc




On a 12 thread system @4.3Ghz it took 14mins and 27 seconds to render at 2560x1440px (scaled down for bandwidth reasons).



Optimising the render
1) Turn down the AA, AA is a render killer, most of the time 4x isn't needed(except on glass, where 8x is preferred.
We'll turn this down to 2x and increase the Threshold to 20% from 10%, threshold determines how many of the pixels in the image have AA applied:
10% ~ 40% of image
5% ~90%
20% ~ 32.5%

2) Adjust the Raytracing depths, by turning the Ray Depth, Reflection Depth and Shadow Depth down we reduce the number of times the ray is calculated to bounce from one surface to another. This can be useful in scenes with lots of complex glass and reflections, which do not need to be perfectly accurate.
I've also turned Ray Threshold up, this value determines when a light ray is too dark to bother calculating any further. At 0.1, this is a very dark value, at 5% it's less dark. If the threshold is too high, the render will be significantly darker than expected.

3) Basic GI turning, there are a lot of options in GI, which would take me a long time to explain, it's easiest to just turn Stochastic Samples and Record Density to low. If the render then results in blotchy looking light in areas between light and shadow, then turn the setting up to medium or high.

4) Reduce the AO, if the AO is not very noticeable, you can get away with using fewer samples, here I turned the Maximum Samples down to 48. If you get very noisy looking AO shadows, then you'll need to turn the samples up.




On the same system as before, this reduced the render time by a factor of 3.85x to 3mins and 45 second with minimal difference in the final render.




This layer difference between the 2 renders shows how little difference there is in the actual images, despite the massive speed increase.




Side by side comparison:
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Re: Tips for faster C4D renders
Old 03-12-11, 23:57   #2
 
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...what. the. fuck?
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Re: Tips for faster C4D renders
Old 04-12-11, 00:23   #3
 
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Quote:
Originally Posted by Pilot View Post
...what. the. fuck?
It'd make sense if you're familiar with cinema 4d.
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Re: Tips for faster C4D renders
Old 04-12-11, 00:30   #4
 
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I bet it would o.o
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Re: Tips for faster C4D renders
Old 04-12-11, 08:12   #5
 
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hey, can I have the Chopper alone for a Tag? looks epic IMO
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