And remember, the outcome always depends on the original density stored in the vdb file so if you try with other clouds you may get different results. The examples above were all rendered with the Single Bounce only option enabled. All tests were pretty much around the same rendering time. Notice that values above 50-100 don’t affect the look that much: there are only small variations in areas with low density values. The Scattering Scale is useful to make the cloud look whiter. It isn’t something you can change here in 3ds Max, unless you make use of a plugin to manipulate vdb data. The number of cells depends on the source file. Keep in mind that it also affects the size of the vdb file on disk and the render time. The bigger the number of cells, the higher the amount of details of the cloud. In particular, the Size of the bounding box containing the volume, and how many cells it contains. Under the Statistics tab there are some useful details regarding the vdb file we imported. You can also change the amount of points, used to preview the volume, with the Quality parameter. If you don’t see anything, under the Viewport display, set the type to Point Clouds. Shading and Rendering in Corona Renderer 6Ĭreate a CoronaVolumeGrid and link the VDB file from disk. Possibly we may look into that in another article. Since we only want to render clouds, and not model them, we don’t need to know about how they form in the sky, depending on weather conditions.

Without Multiple Scattering, the cloud would be rendered as a dark volume, as we’ll see in a moment.

Corona renderer water absorption