In case of a sub-context jit.gl.camera, not having glfrustum does not allow to have a different aspect ration for the capture.(try changing the viewport in the patch…)
the ratio(aspect) sticks to the main window aspect ratio.
With jit.gl.sketch (glfrustum+drawobject), you can capture a sub-context square view and reuse it in an the main rectangle render.
Without glfrustum/glortho in jit.gl.camera, sub-compositing in 3d with the great new object is nearly useless…