some improvements for the way we test DistortedObjects.
Cleanup, consistent variable names, minor details.
Cleanup.
Effects2D should be finished.
remove debug
Effects2D almost finished.
More progress with Effects2D app.
Upgrade what used to be the 'Scratchpad' app; step 2: reorganize layout
Upgrade what used to be the 'Scratchpad' app; step 1: rename.