Volume#
(MaterialPhysicalVolume)
- Category:
/Material/Physical - Default object name:
volume
Description#
A volume physical material
Attributes#
| Name | Type | Description |
|---|---|---|
| Export Aovs | bool |
Compute and write Aovs defined in the shading graph |
| Arbitrary Output Variables | reference (AovStore) |
Set the list of extra channels to write to the image. |
| Light Path Expression Label | string |
Set the material label in light path expressions. |
| Material Sample Count | long |
Material sample count per pixel. |
| Volume Sampling Multiplier | double |
Material volume sample count multiplier. |
| Russian Roulette | double |
Amount of Russian roulette used on the material samples. |
| Roughness Noise Optimization | double |
Noise reduction strategy along rough light path. |
| Volume Depth | long |
Maximum volume depth. |
| Optical Mode | long |
Select whether the optical properties of the volume are defined using the absorption-scattering, scattering-attenuation, or attenuation-albedo pair of parameters. Note that in the scattering-attenuation mode (Legacy mode - provided for compatibility purposes), the volume no longer obeys the physical law of energy conservation (i.e., the particles will scatter more light than they receive) whenever the value of the scattering parameter is greater than the value of the attenuation parameter (hence yielding a negative absorption and an albedo greater than one). |
| Absorption | double[3] |
Set the relative absorption cross section of the volumetric particles. |
| Scattering | double[3] |
Set the relative scattering cross section of the volumetric particles. |
| Attenuation | double[3] |
Set the relative attenuation (absorption + scattering) cross section of the volumetric particles. |
| Albedo | double[3] |
Set the reflectivity of the attenuating particles. |
| Emission | double[3] |
Set the quantity of light emitted by particles. This adds a constant color on the whole volume and doesn't affect the transmission of light. |
| Density Multiplier | double |
Multiply the density of the geometry by this value. |
| Forward Scattering | double |
Control the intensity of the forward scattering. Use a negative value to obtain backward scattering and a null value to scatter the light in all directions with the same intensity. |
| Sampling Optimization | double |
Allow to divide samples among overlapping volumes. |