Bugs in ThreeDWorld:

- check use of shadingProps for consistency (should they persist across shadingClass changes)

- Replace lights as shapes with dedicated light type

- Why is there bad shading on antialiased texture? (too dark?)

- Put keywords for texture types in MappedAndSolidTexture.mesa or somewhere better

- FillinConstantBackground blows up in SampleMaps stuff if mins not zero

- AISAnimationImpl.PlayBackAISCache puts image in upper left?

When playing back an AIS Animation sequence, AISAnimationImpl.CacheNumberedAISFiles places the viewport in the center of the screen 
(assuming a 400x300 viewport) which is nice. When the animation is rerun with AISAnimationImpl.PlayBackAISCache, the viewport moves 
to the upper LHS of the screen leaving part of the old image on the rest of the screen. It would be nice if the sequence were 
played back in the the center. -- JShaw.pa

- Anti-aliased hidden line drawings

- Anti-aliased text always overwrites (extensions to ImagerSmooth required)

- Patch.type not set for sort procedure?

- Why does sortSequence disappear during animation?

- Weird little spots when making expanded tetrahedron with one black face

- Differentiate between taxture space functions and bump/surface changing functions for shading purposes (see: Do we have texture? 
in Renderwithpixelsimpl)
 
- Put in signal to catch wierd looking texture values (usually assumed to be small integers)

- Expansion on open edges wrong on Bezier patches 

- Smooth shading doesn't match where subdivision is uneven on Bezier patches

- No auxInfo for PatchfromPolyProcs

- What do you do about normals for patch objects (for texture mapping etc.)?

- backfacing polygons not shown in transparent closed surfaces

- get Context from pixels using individual imager devices (ImagerDitheredDevice, etc.)

- pixelmap from pixel array?

- Clipping and transparency interaction with nonplanar polygons

- MakeTxtrCoordsFromNormals bug

- Do proper clipping for patches

- Bezier Clipping on convex hull needed in StraightWithin procedure

- Unexplained shading variations in smooth top view of teapot

- Off-pixel vertices for ScanconvertImpl (to fix missing pixels between patches)

- Log file needs to be removed when window is destroyed and window removed when log closed

- Orbiting in a viewport further restricts the viewport

- new set of sort errors in 5 objects testscene

- Implement GetImagerCtx for RenderWithPixelsImpl

- Fancy tiler doesn't add spots up quite right - off by more than one?

- Cursor mashes nojaggy tiler

- Resolve ShapeTwiddle - ThreeDSurfaces.WriteShape vs. ShapeTwiddle.WriteShape mess

- Stop doesn't abort all procs properly in distributed world

- Strange sort error on rearmost banana in the field of bananas

- Cost factor broken for large number of processes

- Should load and store directly to/from interpress files (including textures)

- FileStream.StreamFromOpenStream allows process communication, should be useful