How to orient the visualizer to capture the side of an object with the longest plane?

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I'm working with voxels that are semi-randomly generated. Because of this, their geometry is not always consistent. I want to use the visualizer to capture a png image of the side of the voxel grid with the longest face. For instance, if I was working with a rectangle, I would want to capture the face of the long side of the rectangle. How could I accomplish this?