More advanced users can set up their embed with a 3D (i.e. stereo) image. For vrEmbed we currently assume that the left and right images combined together into the same
image, typically side-by-side or top-and-bottom.
We need to tell vrEmbed where the left and right images are. We measure the x-coordinate from left to right going from 0.0 to 1.0, amd the y-coordinate from top to bottom also going from 0.0 to 1.0. Note that at the moment we do not
support pixel coordinates - these are floating-point values (this may change depending on need).
We define (LTx,LTy)
as the top-left coordinate of the left image, (LBx,LBy)
as the bottom-right coordinate of the left image. (RTx,RTy)
correspondingly match the right image.
Easy setup of these parameters is available in the create tool