Better settings for building fire

[cb LLC]

Hi team,
Can you please give me a sample scene where building fire looks nice. Ours looks to choppy, too pixelated (even though the res is not bad), flames look to big and strange. We used PCG mode. Buffered is too slow. I attached out phoenix box maybe our settings are wrong? There is just something wrong. We render using octane like any other render can render VDBs Thank you

[squintnic]

watch the hammer chen tuts

[georgi.zhekov]

Hey,

Your resolution is not that high at all - you could increase it quite a lot more (like 5 or 10 times) if you feel the resolution is the problem.

Can you give us some reference of what you're after?

[georgi.zhekov]

You can also play around with the render settings for the fire.

Take a look at these tutorials for some ideas on how to approach your scene - https://docs.chaosgroup.com/display/...X/Fire+Tornado

https://docs.chaosgroup.com/display/.../Burning+Chair

Cheers,

[cb LLC]

Hey,

Your resolution is not that high at all - you could increase it quite a lot more (like 5 or 10 times) if you feel the resolution is the problem.

Can you give us some reference of what you're after?

Thank you. I guess simulating quality fire will take a long time per frame with high settings

[cb LLC]

Anyway to make PCG to look as good as buffered? Buffered is just painfully too slow

[georgi.zhekov]

It really depends on the results you're after. So it is best to test what works best for your case.

[cb LLC]

It really depends on the results you're after. So it is best to test what works best for your case.

And one more questions when using PCG I get lines in flames (if you zoom in you can see) Will increasing SPF help or quality 100 is not enough? Changing resolution will just make more thinner horizontal lines . Currently we have SPF set at 2 Thanks

[georgi.zhekov]

You can try and change your Sampler to Spherical in the Rendering rollout. Also changing the render step can help for that.

[cb LLC]

You can try and change your Sampler to Spherical in the Rendering rollout. Also changing the render step can help for that.

maybe that's how gpu renderers work?
it still has horizontal lines. strange

[Svetlin.Nikolov]

Hmm, if you are using Octane, I'm not sure it has the spherical sampler, so you might try and smooth the cache data from the Input rollout. Watch out and don't boost the smoothing too high, or it might slow down calculations.

[cb LLC]

Hmm, if you are using Octane, I'm not sure it has the spherical sampler, so you might try and smooth the cache data from the Input rollout. Watch out and don't boost the smoothing too high, or it might slow down calculations.

Hi,
you said "might try and smooth the cache data from the Input rollout"
Do I adjust something in the input rollout?

Here is the link to the scene and sim https://we.tl/t-Fb18DTbp3t Could you try it with vray? I wonder if it is octane's problem or GPU renderers do it.

Thanks

[Svetlin.Nikolov]

Hmm, indeed looks like spherical sampler would be the solution. Note that it's also available when rendering with Scanline, so you can try it out as well and compare:



Otherwise, try the Input smoothing with values in the range of 60/0/0 to 80/0/0. The sampler type is quite important though... Linear does not hold up when you are looking at the grid along any of the grid axes, so if you have the freedom to move the camera around, maybe try that, or alternatively, rotate the grid at 45 degrees before simulating and run the sim this way.

[cb LLC]

Hmm, indeed looks like spherical sampler would be the solution. Note that it's also available when rendering with Scanline, so you can try it out as well and compare:



Otherwise, try the Input smoothing with values in the range of 60/0/0 to 80/0/0. The sampler type is quite important though... Linear does not hold up when you are looking at the grid along any of the grid axes, so if you have the freedom to move the camera around, maybe try that, or alternatively, rotate the grid at 45 degrees before simulating and run the sim this way.

HI,
it ried spherical sample and it did nothing. maybe it applies to vray and standard engines
And smooth did nothing. It shows in viewport but not during rendering. I guess octane with their limited support

Thanks

[Svetlin.Nikolov]

Indeed, the spherical sampler is available only for Scanline and V-Ray - i.e. when Phoenix handles its own rendering. However, it's strange that the smoothing is not being handled by Octane - this might be something on our side, let me check...