Volumetric material

[uuderzo]

Hello all! I'm new to the forum, just purchased a VRay|modo license.
I'm having a bad time trying to render a volumetric "gas" sphere, modulating the fog density with a fractal noise.
More or less like the user manual example images.

I tried with the atmosphere effect using the gizmo (and hiding the mesh).
In this case i can see the fog effect contained in the sphere but i'm not able in any way to modulate the density.

Tried also with the volumetric material but in this case i was not able to get anything but the initial sphere.

Sure i'm missing some fundamentals, where can i look for more information? The user guide is too concise for me.

Thank you! Umberto

[vladimir.nedev]

The most important thing is to have the procedural texture's locator set to Solid Projection Type.

For the volumetric material, you need a separate surface material that is at least partially transparent, so you can see the volume inside.

Also, make sure to have the step size set to 2-3 times lower than the fog distance, especially when using a density texture.



I am attaching 4 example scenes.

env_fog_textures.zip

Greetings,
Vladimir Nedev

[uuderzo]

Got it! I was mainly fooled by the bercon noise low/high levels.
Thank you so much for the examples Vladimir! Now it's working.

Umberto