Question about progressive render for animation.

[Daskydesign]

Hi,
I just started to try a Corona demo version with 3ds and I think to buy it but,
my question is:

From what I understand, I can only use progressive rendering.
In an animation if I use the "time limit" every frame will have a different quality depending on the complexity of the frame.
At the same time if I use the "pass limit", I do not know how many passes I need to have a good quality.
Right?
So my question is:
How I can do to render an animation that has a constant quality in all their frames?
(When I tried Vray I used the bucket mode)

What is the best way to render a more frames animation in Corona?

[romullus]

Hi,
there is also noise level limit. Setting it to some value should give you pretty much equal quality frames.

[Saif]

What's a good standard value for that Noise level ?

[Daskydesign]

Noise level limit is a good suggestion.
I must try it.
Thanks romullus

[Frood]

What's a good standard value for that Noise level ?

It depends on the scene (interior/exterior, amount of background visible, light setup etc.). Try to start with noise level 5% and a denoise amount of about 0.6. That should give you an idea about render times and quality (we used this setting sometimes even for final 4k passes which were composed into real footage due to existing camera noise). And it may rarely be additionally required to use a pass limit that suits your needs regarding AA so that you don´t drop below a certain amount of passes. Starting from here you can tweak depending on the result, always create a short animation to judge - even when it´s only 1s long :)

Good Luck

[Daskydesign]

Thanks for reaply.

I tried to do some tests.
From what I've seen I do not think the noise limit is friendly animation.
I try to explain why (if I'm wrong please correct me)

I did a test with a photographic backdrop scene (limbo)
and an object in the center.

Render 1:
Object with plastic material - noise limit 5% - 45 passes

Render 2
Object with metal material - noise limit 5% - 76 passes

Conclusion, the noise on the photographic backdrop will be different

Is my thinking wrong?

[Frood]

Depends on what you consider to be "animation friendly". Even though I don't quite understand what you mean by "backdrop scene (limbo)" exactly, assuming it´s a photo either mapped on a plane or in some environment slot:

1. Backdrops should be posted anyway (render on black)
2. Adaptivity should give an image backdrop very few samples so that there will be no visible difference in this part of the frame between 45 or 76 passes (enable CInfo_SamplingFocus render element and have a look. If it´s very contrasty I could be wrong). The additional passes should just have contributed to clean up your obviously harder to render metal material, that´s the idea
3. You will never create an animation with 5 frames plastic material and the next 5 frames metal material, will you? ;) But you are right, the backdrop noise will be different then as it will be at any scene or camera change when using adaptivity, but I doubt it will be noticeable.


Good Luck

[maru]

Noise limit should work fine if the complexity of the scene is uniform across all frames. If that's not the case, e.g. if camera moves from a room with furniture, to exterior where only one tree is growing, seen against a bright background, then the quality may vary. This is something the dev team is aware of, and, despite the fact that everything is working as intended, we are planning to improve this in the future releases.

The safest solution is using the pass limit. You do not know how many of them is required, but one way to tell it is rendering one frame. If you decide that the quality is too low, instead of re-rendering the image with a higher pass limit, you can just use the "continue rendering" option, and give it a few more passes. All of this might be a bit confusing at the beginning, if you have never dealt with a progressive renderer before, but once you get the hang of it, it becomes super simple. That's why we have so many amazing renders in the gallery. :)