Add support for orthographic cameras

[Happyrobot33]

Pretty simple, allow for orthographic cameras to give back the correct value. This should fix 2D representations of tags

[keijiro]

Sorry but I can't understand what you're trying to do. Do you have an orthographic camera in the real world? Or are you trying to feed orthographically rendered frames to Apriltag?

[Happyrobot33]

im trying to feed a image that has a 2D apriltag on it, and getting screenspace coordinates from it. I actually eventually figured it out, but I need a dummy camera to do it and its quite jank. there is also currently no way to get the actual width of the tag itself, making getting anything but the center of the tag difficult

[Happyrobot33]

For more context, something like this is difficult to get information from
im trying to get the "box" that these two apriltags create, but at most im currently only able to get the horizontal line between their centers, and have to hardcode a height

to add on to that, the only way im able to get screenspace coordinates of this is by having a non rendering camera so I can convert the worldspace coordinates to screenspace ones