Want to have speed improvement for free? Suggested settings for speed

Corona Corona for 3ds Max General
1

Hi,

If you want to render faster, change these settings from the defaults.

In the Performance tab:
Max Sample Intensity to 1

In UHD Cache, also in performance:
Precision: 0.1

You’ll be able to compare the difference better if you set IR Subsampling at 0, in Performance/Development/Interactive rendering.

Does anyone suggest anything else to speed rendering up?

Thanks.
Guido.

2

But you are sacrificing physical accuracy, and will get a darker image with less intense reflections and caustics. The defaults are in fact chosen for a very good reason, as the best balance between speed and realism :smiley:

https://coronarenderer.freshdesk.com/support/solutions/articles/5000515636-what-is-max-sample-intensity-msi-

3

I couldn’t notice a difference in realism to be honest.
Yes, the image gets darker, but you can play with the exposure.

For some projects, probably most, I’d choose to have agile interactivity rather than to care about a slight difference in brightness

Also I’d be interested in knowing other tips that could speed up rendering with little “repercussions”.

4

I would strongly advise against from telling everyone to use an MSI of 1, as Tom has mentioned, the amount of energy (and photorealism) you will lose would be substantial in brighter scenes. Plus anything that needs appropriate data on values greater than 1 for realism will look wrong too (like bokeh’ed lights).

Oops, I meant to say ‘advise against’, not ‘advise’.

5

By setting MSI to 1 you basically kill all global illumnation in your scene. See the attached examples.
By setting UHD Cache precision to 0,1 you are risking that splotches will appear in your renders.

msi20.jpg
msi20.jpg1280×720 127 KB

msi1.jpg
msi1.jpg1280×720 71.8 KB

6

But you still have the first bounce, no?

See attached.
In this room there are no windows and the only source of lighting is rectangle lights pointing down.

Fast previews.jpg.jpg
Fast previews.jpg.jpg1179×570 122 KB

7

Still not a good idea, for the reasons mentioned - in exceptional situations maybe this would be of use. If it was the right setting for most cases though, it would be what was in the default. As ever, the rule with Corona Renderer is “don’t change the defaults, that we’ve carefully selected, unless you have a very specific reason for doing so” :smiley:

8

PS - great Corona training available at https://corona-academy.com/ :wink:

9

Ok.
Thanks.
The reason I thought of changing them came after playing with Fstorm. ( sorry for bringing this up here).
Its defaults don’t seem to be physically accurate, but you start with really fast previews until you need to bump up the quality.
Just saying.

At the same time, the Fstorm style for interiors, which is very liked in general AFAIK, seems to have weaker GI, which lowers the color bleeding giving a cleaner look (in my opinion).

10

Oops, I meant to say ‘advise against’, not just ‘advise’.