Problems with RGB in smoke and fuelballs. Always get black/dark tones.

[Bruno_GG]

Hi there!

I'm new to Phoenix and Vray

I'm struggling to get rid of black/dark tones when I use rgb on my smokes or fuel balls.

I uploaded a video explaining the issue.

Its basically a simple smoke burst having set its source and to use rgb, also set on the volumetric options Smoke Color.

Its RGB map uses a cellular difuse material with two colors (now set to white and green to test).


How can I get rid of these black areas in my fumes? I'd really like to be able to play with colouring clouds freely.

[Bruno_GG]

Link to scene file:

[georgi.zhekov]

Hey,

Just disable the Mapper in the scene and you will get the result you're after.

You're already setting the RGB from the source in this case - there is no need to use the Mapper as well.

Also note that by using the texture under the RGB channel and turning on modulate - this will multiply the texture by the RGB channel values (you certainly can do that, but you don't always need that in order to color the smoke by the RGB channel).

Cheers,

[Bruno_GG]

Thanks Georgi

Sadly no luck here after deleting the mapper and unticking modulate (and resimulating of course)

What could I be doing wrong?

My smoke source inject comes from the pflow event btw (therefore the trails)

[georgi.zhekov]

Hey, sorry for that totally missed a few things.

So in your case you're using Simple Smoke Opacity of 1 and in the later frames the opacity of the smoke gets really low like 0.0001 and the RGB color doesn't get through correctly.

In order to get what you're after you can set the Smoke opacity to be based on Smoke, set the minimum visible opacity to 0 and set the values for the first point to 0 for x and y.

[Bruno_GG]

No luck again mate

The black seems to go away like that but I still lose all the alha like half way the simulation

I set Smoke Opacity to "Smoke" from SImple Smoke with minimum opacity set to 0 and first point set to 0 on x & 0 on y

[georgi.zhekov]

Hey,

In this case - it's just the way the GPU preview works (it's just an approximation of what the render will look like, but it won't match 100%). So if you make a render you will notice that the smoke won't be visible as it's value is really low.
If you wish to get an accurate representation while adjusting your settings you can use the V-Ray IPR.

If you wish your smoke to not dissipate so fast - just lower your smoke dissipation value.

[Bruno_GG]

Thanks Georgi

I get this when I try using IPR
how do I get through that?

[georgi.zhekov]

Set your render mode to Volumetric Geometry from the Phoenix rendering rollout.

[Svetlin.Nikolov]

... or use IPR on V-Ray GPU.