Bug with Phoenix fire and smoke

[coilbook]

Hi,
If I animate phoenix temperature down to where only smoke is visible smoke catches on fire even more

[neonZorglub]

Hi,
If I animate phoenix temperature down to where only smoke is visible smoke catches on fire even more

Thank you for the scene !
It had me scratch my head a bit !
The problem basically comes from the inverted Volume Ramp texture in the Emission ramp.
The color on the left should be dark, and color on the right the most bright.
Another issue is on the texture emission power; I changed from 10 to 0.01
So the Emiss. scale now works fine:

phoenix_emis_scale_ok.zip

(927.24 KiB) Downloaded 112 times

Note: the temperature values created from Phoenix are quite high, (up to ~2000.0), that's why the emission power should be small..
Hint: we can see the max value of each channel from the Octane Graph viewer, while rendering in Octane viewport, and selecting the Volume node:
for example, on frame 21, there's '131 x 179 x 107, 2509043 voxels, max abs/scat/emis: 1 / 1 / 2000

Thanks

[coilbook]

Hi,
If I animate phoenix temperature down to where only smoke is visible smoke catches on fire even more

Thank you for the scene !
It had me scratch my head a bit !
The problem basically comes from the inverted Volume Ramp texture in the Emission ramp.
The color on the left should be dark, and color on the right the most bright.
Another issue is on the texture emission power; I changed from 10 to 0.01
So the Emiss. scale now works fine:

phoenix_emis_scale_ok.zip

Note: the temperature values created from Phoenix are quite high, (up to ~2000.0), that's why the emission power should be small..
Hint: we can see the max value of each channel from the Octane Graph viewer, while rendering in Octane viewport, and selecting the Volume node:
for example, on frame 21, there's '131 x 179 x 107, 2509043 voxels, max abs/scat/emis: 1 / 1 / 2000

Thanks

Thank you! Do you guys have any plans to simplify the way octane renders flames? It seems that there are too many repetitive settings in texture emission, ramp emission, and octane volume modifier. Gets confusing

[neonZorglub]

Hi,
If I animate phoenix temperature down to where only smoke is visible smoke catches on fire even more

Thank you for the scene !
It had me scratch my head a bit !
The problem basically comes from the inverted Volume Ramp texture in the Emission ramp.
The color on the left should be dark, and color on the right the most bright.
Another issue is on the texture emission power; I changed from 10 to 0.01
So the Emiss. scale now works fine:

phoenix_emis_scale_ok.zip

Note: the temperature values created from Phoenix are quite high, (up to ~2000.0), that's why the emission power should be small..
Hint: we can see the max value of each channel from the Octane Graph viewer, while rendering in Octane viewport, and selecting the Volume node:
for example, on frame 21, there's '131 x 179 x 107, 2509043 voxels, max abs/scat/emis: 1 / 1 / 2000

Thanks

Thank you! Do you guys have any plans to simplify the way octane renders flames? It seems that there are too many repetitive settings in texture emission, ramp emission, and octane volume modifier. Gets confusing

As for the content of each node, it's designed by the engine team, and there's basically a good reason for each setting, but might be simplified / refactored over time.. For the 3dsMax side, we are planing to make sub textures editable in the object dialog, with also a configurable simplified list of parameters. That will be nice for lights, Phoenix modifiers, as well as all AOVs that can become deep and complex..

[remKa]

Hello,

it seems that volume ramp texture has no effect anymore on the look of the fire... and you removed the max grid ?

I'm using Phoenix FD and I find that convincing and nice looking flames are really hard to achieve in Octane, do you have any hint ?

https://www.youtube.com/watch?v=vIclhO2aJ6M