Volumes - Arnold for Houdini
Volumes are objects made of density, such as fire or clouds.
Note:
The rendering of volumes should not be confused with atmosphere_volume, which is a global effect.
Note:
Volumes can only receive indirect lighting from other emissive volumes when the volume_ray_depth is above 0.
Volume Formats
- Rendering volumes with HtoA only works with OpenVDB files or VDB primtives.
- You can also develop your own volume plugin with the new volume API.
- It is also possible to render particles as volume.
- You can also render polymeshes as volumes.
Volume Nodes
- Arnold volume - Arnold volume object node.
- standard_volume - Shader that defines the volume shading properties.
- volume_sample_rgb and float - Shaders that sample a volume channel.
Render Quality
Several parameters affect the overall quality of volume rendering:
- On the Arnold ROP: volume_diffuse_samples
- On the Arnold ight: volume_samples
- On the Arnold volume: step_size