Comment #2 on issue 969 by tu...@tudorgirba.com: Roassal crops the exported PNG http://code.google.com/p/moose-technology/issues/detail?id=969
The problem is that the export relies on ROView>>#elementsToRenderDo:, but this method takes into account only the cached elementsToRendered. Essentially we need to recompute those elements to make them take into account the entire canvas.
There exist a ROView>>#updateElementsToRender but this one is not activated during the export because the actual camera is not resized (only the canvas is).