Check some preconditions in the check method, delegate to different
methods for different cases, also to have smaller method bodies.
IsAboveStairs is only checked for "mild" y-distances. For faster
descending an individual edge-check has been added.
Allow all blocks that get the IGN_PASSABLE flag set but which the player
can stand on to be ground from height 0 on (GROUND_HEIGHT, takes
effect unless for blocks with an explicit workaround). Set IGN_PASSABLE
and GROUND_HEIGHT for ENDER_PORTAL_FRAME explicitly.
General:
- Wrong flags checked or flags checked in the wrong way.
- isPassable should use collidesBlock.
- collidesBlock should not see high-value-only matches as collisions.
- collidesCenter returns true for the case of collision (...).
Liquid blocks:
- New flag introduced to model rough liquid height for flowing liquids.
- One more workaround condition for moving in/off liquids.
- Use exact bounding-box for liquids checking in PlayerLocation.
- Check for water first in PlayerLocation.isInLiquid.
Other:
- Alter some block flags and workarounds.
- (other)
Set as default, the "strict" option will also check the angle between
the viewing direction and the direction towards the target. This might
not stay the default method, but it does help against auras in close
combat.
This method remembers (currently) each velocity added and only uses it
when it is needed not to generate a violation. Further (currently
simple) activation and invalidation logics are applied. With this method
latency will be much less of a problem, though stacking of queued
entries (especially for rocket-boots style flying) and more
merging of entries and more invalidation logics are required, thus
bleeding+instable.
On the long term this should make cheating much more difficult, possible
steps are:
1. Use method for vertical velocity too (only positive)
2. Distinguish positive and negative vertical velocity (opens a way to
control the speed downwards in any medium!).
3. Per-axis velocity (either absolute or pos/neg with more invalidation
logic on direction changes).
