Volume Rendering with Octane Render for Cinema 4D – God Rays
An excerpt from “What’s New in Octane Render v3.x”
In computer graphics, Volume rendering is a set of techniques that make it possible to display a 3D scalar field. This field is usually a grid, where each element, or voxel, translates to a single value. We obtain this number by sampling the immediate area surrounding the voxel. Finally, the file format, that often stores this data, is OpenVDB. Most of all, it is a library, that allows users to efficiently utilize big amounts of voxels that, consequently, produce volumetric effects.
So, the way Octane Render handles Volumes is via Ray Casting. As a result, the engine shoots a ray towards the field and collects various data as it passes through it. The frequency, at which a ray gathers information, is available in the interface as a parameter called “step length”. Additionally, there are properties like absorption, sub-surface scattering and emission. These allow users to accurately emulate various natural and unnatural phenomenons.
Furthermore, Volume rendering supports Jawset’s Turbulence FD – a widely popular 3rd party plugin for Cinema 4D.
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