Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: acrobaticpoly on 2023-04-27, 23:50:18

Title: Phoenix 5 Candle Sim Issue
Post by: acrobaticpoly on 2023-04-27, 23:50:18

Hi everyone,

We seem to be running into an issue here with all of our candle simulations in Phoenix 5 using Corona. We're are simply trying to add a candle simulation to our scene but whenever we render it, either the flame gets cut off or it is being stretched. We've tried increasing the adaptive grid and adjusting a few other values but whatever we do, it still remains distorted - even with default values using the "setup a candle sim for the selected object" option.

I've attached a link to some images that shows what I mean - you can see that in the viewport the candle appears normal but when you render it, the flame is extremely stretched:
https://paper.dropbox.com/doc/Issue-with-Phoenix-Candle-Sim--B3NiL9yJoDTir3bfzCPe7zTQAQ-dNUizxZuBh1iglJVciStV

Does anyone else have this issue?

Many thanks in advance for you help,
Michael

Title: Re: Phoenix 5 Candle Sim Issue
Post by: TomG on 2023-04-28, 09:12:28

Which version of Corona, which version of Phoenix, which version of Max?

Title: Re: Phoenix 5 Candle Sim Issue
Post by: Beanzvision on 2023-04-28, 09:32:05

I believe it's Corona 9, Phoenix 5 & Max 2023 ;)

Title: Re: Phoenix 5 Candle Sim Issue
Post by: maru on 2023-04-28, 10:11:42

Hi, please submit a new support ticket here: https://support.chaos.com/hc/en-us/requests/new
Then share your ticket number here. We will make sure that Corona team + Phoenix team assist you together. :)

Title: Re: Phoenix 5 Candle Sim Issue
Post by: acrobaticpoly on 2023-04-28, 11:27:49

Thanks for the speedy feedback guys!

Beanzvision - you have impressive inference skills! ;)

Thank you Maru, I'll create a ticket now!

Edit:Ticket number is #110557

Appreciate the help.

Title: Re: Phoenix 5 Candle Sim Issue
Post by: maru on 2023-04-28, 16:36:30

(sharing this in addition to the support ticket)
 
I have discussed this issue with one of our Phoenix gurus and here is the explanation:
 
Due to the way Corona currently handles volumetric opacity, the candle simulation will render differently in Corona than in V-Ray, even with the default setup.
In order to match the render result to the viewport preview in your case, you can: 
 
- Select your Phoenix object, go to its Rendering rollout, click "Volumetric Options..." and in the pop-up window change "Fire Opacity Mode" to "Use Own Opacity".
- Then use the Curve below to adjust the flame appearance to your needs
 
Here is a video showing the steps : http://ftp.chaosgroup.com/support/scenes/3dsmax_2023-04-28_14-54-37.mp4
 
 
I hope it helps! Please let me know if you need some further assistance.

Title: Re: Phoenix 5 Candle Sim Issue
Post by: acrobaticpoly on 2023-04-28, 22:22:19

Maru, you're a legend!

This is fantastic, thanks so much for also providing a video on this too, really appreciate it! I'll give it a go now!

Thanks again!