NEW IN R20
Volume FilterBasic Coord. Mode Filter Fields
Since the Volume and Smooth Filters are treated as a single object internally, they will be described here on the same page.
What is a Volume Filter? First, imagine a bitmap: this is made up of pixels with (RGB) values. Photoshop, for example, has a filter with which these can be modified. The Volume Filters work analogous to this: if Voxels are viewed as pixels arranged in 3D space, Volume Filters do nothing more than modify the Voxel values.
Hence, Photoshop and Cinema 4D both have filters with a Gaussian Blur function:
If we continue with the analogy above: In Photoshop, a filter effect can be masked, i.e., restricted to a specific region, by selecting a filter function. This can also be done in Cinema 4D. However, this is not done via selection but by placing Fields in the Tab "field" with which you can define where the Volume Filter should have an effect.
Volume Filters can, for example, be used to smooth or erode/ dilate:
In order for the Volume Filter to work, they must be either:
The Smooth Filter blurs the Voxel value transitions. Imagine a Voxel A with a value of 0 and a neighboring Voxel with a value of 1. After smoothing is applied, these values will be modified to maybe 0.4 and 0.6, respectively. Abrupt transitions will be blurred. The visual effect is a rounding of sharp edges.
Simply put, the Reshape Filter offsets surfaces in various ways along their surface Normals. Internally, the Voxel values will be increased or decreased with in the area affected by the filter (Filter Type Offset).