linvanchene wrote:Is there any chance that the volume step length can be set on an object level in the future?
Yes, we are still busy working on major feature enhancement to the volumetric support you're seeing in alpha 3. The volume node will look substantially different very soon, but in terms of priority, colour ramps for volumes will be done before the step length enhancement.
Some more information on the step length:
We use raymarching for rendering volumes, and each step along the march is a fixed size in metres. This is the step length you are seeing in the kernels. The smaller the step length, the more accurate the results. When you have a larger step length, one that goes across many voxels, Octane must pick a single density for the whole step. Many voxels will get missed, and when it misses a few voxels with a high temperature, then the emission will be lower in that area. This is why lowering the step length changes the look of a volume. The same goes for absorption and scattering.