[OT] clever use of mask

[Geoff Canyon]

On Wed, Dec 30, 2015 at 4:03 PM, Richmond <richmondmathewson at gmail.com>
wrote:

> I wonder why stuff like that is not more accessible?
>

​Same here. I wish I had seen this back when I was fooling around with a 3D
space simulation. I was having some trouble getting the general rendering
correct, and despaired of being able to do anything reasonable in terms of
rendering a globe, and abandoned it. I never thought simply scrolling a
flat image horizontally within a circular mask would work so well.

Which leads to the next question of course: Scott -- any thoughts on ho​w
to make this scroll in two dimensions? To present a simulation of a real
globe I'd need to be able to scroll up and down, left and right,
diagonally, etc.

I'm not being able to picture how that would work in my head -- maybe an
image that contains the whole "surface" of the globe twice over? Then,
setting the angle of the image and scrolling appropriately might work?