This format is great because it efficiently maps all of the faces of a cube into a fairly usable aspect ratio. And also the three by two cube map that's used internally by Facebook for all of their 360-degree videos. Now if you're the standard or physical render, there's a couple of additional mapping types you can use, including the cross mapping type that's used by Mettle Skybox Studio and other compositing applications.
The string format maps all of the faces of the cube in a horizontal line, and this as well as the equirectangular format, are supported in the standard and physical render as well as pro render. So, Cinema 4D also supports a number of different cube mapping formats.
The problem is that it introduces a bit of distortion especially at the poles, and cubic mapping can help to minimize that distortion. This is the most popular mapping type for 360-degree videos because it fits into our standard 16 by 9 frame aspects pretty well. We can take the same projection and map it onto a C4D sky object or a sphere and we'd essentially have an HDR sky. This basically takes the full 360-degree view around the camera and maps it onto a plane. Now you can see that by default this renders an equirectangular lat/long image. So with any camera that's already been positioned and animated, you can go into the "Spherical" tab and simply check the "Enable" box. And this is all accomplished through the spherical controls that have been added to the camera object. Users of Cinema 4D Release 19 visualize and studio editions can now directly render stereo spherical images for use in virtual reality and dome projections.
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