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Parallel Projection

In making an Escher-like optical illusion maze puzzle, in order to create an optical illusion figure in a three-dimensional model, it is necessary to fix the viewpoint and see it in parallel projection.

When doing this work in Blender, we found that if you use a certain shortcut key, it can fit the viewpoint not only directly above or directly to the side, but also at a specific angle such as 45 degrees diagonally.

Among them, the most useable view for our 3D work was the viewpoint looking down from the direction of the diagonal line of the cube. This view looks at the cube in parallel projection from this direction, it looks like a regular hexagon.

On the Unity side, get the same result as when modeling by setting the camera according to the angle of the diagonal line(arctan{frac{1}{sqrt{2}}}).