This fixes postprocessing example.

Tomorrow Geometries and CanvasRenderer.

Please note that render target must be power-of-2 sized for this trick to work. Other option would be to change directly UVs in the geometry (though that would make it harder to swap image vs render target as texture or to share geometry between objects using materials with images vs render targets).

Fixes #2164

Please note that render target must be power-of-2 sized for this trick to work. Other option would be to change directly UVs in the geometry (though that would make it harder to swap image vs render target as texture or to share geometry between objects using materials with images vs render targets).

Fixes #2164

See discussion in #ab6e9f75

I run chrome with the flag `--allow-file-access-from-files` instead of doing a web server so I wasn't seeing these.

Not too happy about it, I may need to do my own eventually =_=U

Also some small refactoring of BufferGeometry handling in WebGLRenderer.

Fixes #2087