GPU(s) for live Raytraced viewport rendering?


in short: my question is if it is possible and if what hardware/gpu is needed to be able to orient around one product design object in Raytraced mode without stuttering.

-“product design object”: eg a desk lamp i designed where Cycles is quite handy to orient around inspecting the design changes just made in Shaded or Rendered viewport and also how they effect the light emitted by the lamp. But even a simple small table out of some cylinders (round profile wood with wood material)

-Problem: Although it would be nice to have it rendered with as less pixels as possible in a short time when stopping orienting, my main issue is the stuttering that occurs when orienting.

-Scene and setup: I just use the standard settings in Rhino 7 with some materials that come with Rhino (eg plastics, metal, wood, emitted. no bump maps) mainly directly dropped on the parts of the object. I use the render just for visual inspecting not for creating stills.

-Systems tested (obviously not fast enough, but still wondering if my demands are too high and it doesn’t work the way i would like it to):
Acer ConceptD with RTX 2070 and custom build
with 5600X, 32GB, RTX 3060Ti, mainboard for max use of two GPUs (rog strix b550-e gaming).

Thank you!

If you don’t have powerful hardware you may want to bump the responsiveness slider towards faster. Also decreasing sharpness a notch may be useful, maybe even two.

Other than that good hardware helps. With the RTX A6000 and RTX A5000 I have and both selected as rendering device it can be pretty good. I don’t know how the RTX 4xxx compare to these.

Thanks for your quick reply. I tried that but it only helped when putting that setting way down which makes it non-usable for me sadly. I don’t know if tried Sharpness, I’ll take a look thanks.

What I didn’t mention in my post is

  1. Budget is a little limited. Do you know if the “quadro” models you mentioned are the minimum requirements for this task? And both of them?

  2. Also what I didn’t mention is that when I size the viewport down in the 4 view mode it eventually stopps stuttering. So I was also wondering if it would help to switch from a 4K monitor to a WQHD one.

I know it’s a difficult question to answer since it depends on many variables. But the example of the small table is really just somewhere around 40 cylinders placed together and a wood or paint material applied.


Other than the hardware your current best options for responsiveness is the two sliders. The RTX 3060Ti should be pretty ok. Going from 4k to 1920x1080 would be also a good way. That is essentially the same as bumping the sharpness down a nudge on a 4k machine.

Anyway, I would suggest to bump down the sharpness and increase responsiveness by a bump or two. And for sharp results use _Render with Rhino Render. It’ll use the same engine, but do a full resolution render.

Hm ok thanks. I’ll test with my superold HD display then first. :wink:
Do you know what’s the most important factor to look for in the gpu? eg is it the cuda cores? and if the speed and/or the number? Or are RT cores actually used? Wondering if 2 rtx 3080 or 3090 would also help as they are a little cheaper…

To utilize RT cores you’d want to switch to OptiX rendering. Other than that CUDA core count will most definitely help. Go for the hardware with the most CUDA core count that your budget can support.

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