Block rendering overlay system

[Longor1996]

1. Rendering blocks is slow.
2. Rendering tile-entities is slower.
3. Rendering hundreds of them, which TC does and has to, is pure insanity.

The solution: Write a system for rendering cached models and effects per-block.

Use cases:

• All the complex tile-entities that TC renders.
• Custom blocks (yes).

Must have:

• Must react quickly on block updates. No huge delays allowed.
• Must allow alternate triggers for updating the geometry, like a (game)mode-switch.
  • Alternatively: Allow some parts of geometry to be flagged, so its only rendered if the flag is set in the renderer.
• Continuous re-uploading of geometry to the graphics card is a very bad thing in a bandwidth intensive game like Minecraft, so the geometry must be cached.
• Bounding boxes of chunks must expand if the geometry is too large.
  • Alternatively: Add a 'second layer' to it for very large geometry, like the connections between utility blocks. Blocks can then render as usual.
• There should be no hard limits on the amount and looks of geometry.

Optionals:

• Rendered geometry may need to be translucent. (?)
• The system must not render hidden chunks, if possible.
• Rendered geometry may have to be shaded (eg: lighting).