I created this SketchUp extension long time ago. It draws a plane perpendicular to the camera direction, which fills whole current view.
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Category: SketchUp Plug-ins
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Thea for SketchUp 2.1
Altair has just released a new version of my SketchUp extension:
Just to prevent possible confusion, I am the author of the connection between Thae Render and SketchUp, not the rendering engine itself.