Render Time Differences: Bucket vs Progressive. (2000 Tree Multi-Instances Clones)

[KernitTheFont]

Hi all,

I'm trying to render out a 313,000 polygon tree with 2000 multi-instanced clones in a 1920x1439px image, but the render time difference between progressive and bucket is massive. 17 minutes later and the bucket renderer hadn't even finished 1/16th of the image. Progressive gets me a decent image after 5. (same noise thresholds)

Luckily this is just for previs, so using progressive isn't an issue. I've never had to use trees in my work until now, so I've no idea what kind of render times are normal or if this is some kind of bucket bug. I've tried rendering with textured and just a single material which makes no difference.

Scene is here if anyone wants a squizz. Hopefully someone can help me work out what's going on here.

Thanks in advance,

Tim

[aleksandar.kasabov]

Hello KernitTheFont,

I rendered your scene both with bucket and image sampler and I got very similar results on my setup- 36m 52s on bucket and 36m 49s on progressive. Can you wait for the full renders (both on progressive and on bucket) to finish and then share the results with us. Also, please provide some details about your system (processor, RAM, OS, V-Ray and C4D versions). Thank you.

[KernitTheFont]

Hi Aleksander,
I got 2h 51m for the bucket render and 3h 6m for the progressive

Here's my spec (work machine):


Cinema 4D r24

Maybe I was just expecting too much from the multi-instance cloner? Still, nearly three hours seems a bit excessive for a 1920x1439px render on a top end MacBook Pro.

[aleksandar.kasabov]

Hello KernitTheFont,

Keep in mind that I performed my tests on a Dual Xeon 88 cores machine and this is why I got such results. You can check the following article to better understand how to optimize your render settings and reduce your render time. I hope this is of help.

[imdb]

Hello KernitTheFont,

Keep in mind that I performed my tests on a Dual Xeon 88 cores machine and this is why I got such results. You can check the following article to better understand how to optimize your render settings and reduce your render time. I hope this is of help.

Ran some tests, separated parts of the tree into separate components. Looking at interactive render bellow vs production render above. Production render is bucket. Are these supposed to be this different from each other?

[imdb]

Actually. I figured out what it was. Bucket is much slower. However, the main culprit are the Opacity in the Diffuse tab. Those files are 4096, if you reduce the opacity file down to 256x256, render times jump up dramatically.

[sirio76]

Can you share the scene? Bucket and progressive should produce identical results beside possible differences in noise.

[imdb]

Can you share the scene? Bucket and progressive should produce identical results beside possible differences in noise.

It is the same scene from this thread. I made a snafu, that's the difference between Interactive Render (Progressive) and Production Render, Interactive render lacks the details.

The main issue in slow down is large alpha files in complex & excessive geometry.

[KernitTheFont]

Actually. I figured out what it was. Bucket is much slower. However, the main culprit are the Opacity in the Diffuse tab. Those files are 4096, if you reduce the opacity file down to 256x256, render times jump up dramatically.

Good spot, thanks imdb. Lesson learned there!

[sirio76]

I give a quick look in to your scene, probably you can speedup render time by lowering the max AA to 12, it will render more than twice as fast without significant loss in quality. Probably the render can get much faster if developers reintroduce the clipping mode for the opacity map.
Materials can be improved a lot normal maps should be loaded with a linear profile.

[imdb]

I give a quick look in to your scene, probably you can speedup render time by lowering the max AA to 12, it will render more than twice as fast without significant loss in quality. Probably the render can get much faster if developers reintroduce the clipping mode for the opacity map.
Materials can be improved a lot normal maps should be loaded with a linear profile.

Max AA to 12. <-- What does AA stand for?

[sirio76]

Max antialiasing subdivision