Well, rendering data that's already made is very light weight, since it's only a few hundred triangles. As for creating new projections, it depends on whether

Well, rendering data that's already made is very light weight, since it's only a few hundred triangles. As for creating new projections, it depends on whether you can read data from the gpu with gl.readPixels() or not. From googling docs I thought this would work anywhere OpenGLES 2.0 was supported, but my test device claims to support OpenGLES 3, and readPixels() fails on it - I haven't looked closely at why yet.