Powder snow was inert: the player's collision context never carried its
fall distance or boots, block-inside effects never ran for the player,
frozen ticks stayed 0 and the empty bucket only took fluids.
Player (PlayerMotion, LivingEntity.aiStep order):
- PowderSnowBlock.getCollisionShape gets the player's fall distance and
leather boots: it sinks through, walks on top in leather boots (sinks
when crouching), lands on the 0.9-high shape after a fall of more
than 2.5 blocks.
- Entity.applyEffectsFromBlocks over this tick's movement path (the
ported block sweep, StepBasedCollector steps): entityInside makes it
stuck (0.9, 1.5, 0.9) while its feet are in powder snow and sends the
server's snowflake from the level random; FREEZE sets isInPowderSnow
and adds a frozen tick per step; EXTINGUISH destroys the snow if the
player burns and puts the fire out. ServerPlayer.onInsideBlock fires
enter_block for every block entered (which also unlocks the boat
recipes in water, and the end gateway advancement).
- baseTick's wasInPowderSnow lets leather boots climb out (living_air).
- Server freezing: thawing 2 a tick, the powder_snow frost modifier
(-0.05 x percent frozen, not over air), freeze damage every 40 ticks
when fully frozen; leather armor (#freeze_immune_wearables) and
spectators don't freeze.
- HUD: the powder snow outline overlay and frozen hearts.
Items and blocks:
- BucketItem.use on powder snow: pickupBlock (2001), used statistic,
fill sound, FLUID_PICKUP, createFilledResult, filled_bucket trigger.
- SolidBucketItem: the empty_powder_snow place sound and an empty bucket
back in survival.
- Falling blocks land on powder snow, or end up inside it and break
after a fall of more than 2.5 blocks.
test_native_scene_motion gains powder snow fixtures ("snow_tick": the
oracle runs vanilla's real applyEffectsFromBlocks and freezing) and
prints frozen ticks, the snow flags and the stuck multiplier.
Fixes#62
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie
6ce83021b5