# pixlyzer-physics

This [pixlyzer](https://gitlab.bixilon.de/bixilon/pixlyzer) module runs physics test on minecraft and extracts data from it.

## Use cases

- Anti cheat development
- 3rd party clients/servers to not get banned, e.g. integration tests in [Minosoft](https://gitlab.bixilon.de/bixilon/minosoft)
- Maybe mojang themselves? (check if nothing broke in their messy code)

## What affects movement (client side)?

(This list aims to be perfect, but you know its probably not)

- input (keys, mouse)
  - walking
  - sprint
  - sneak
  - rotating
  - jumping
- gravity
- potions/modifiers
  - ~~speed/slowness~~ (sent by server)
  - levitation
  - jump boost
  - blindness
  - slow falling
  - dolphins grace
  - ~~correct expiring (count ticks)~~ (sent by server)
- hunger
- swimming
- elytra (also boosting with firework rocket)
- enchantments
  - depth strider
  - ~~frost walker~~
  - ~~soul speed~~
  - swift sneak
  - riptide
- armor
  - leather boots on powder snow
  - ~~knockback resistance~~
- items
  - usable items (e.g. bow, shield)
  - trident (with riptide)
- ~~damage~~
- blocks
  - collisions
  - block motion (e.g. piston, shulker box)
  - block pushing
  - prevent unsneak
  - climbing (e.g. ladders)
  - scaffolding
  - stepping (e.g. stairs)
  - honey
  - soul sand
  - fences
  - bouncing
    - bed
    - slime
  - slow movement
    - powder snow
    - sweet berry bush
    - cobweb
  - slippery movement
    - ice
- vehicles
  - riding (e.g. horse, strider, ...)
    - jump strength
    - time on space bar
  - boats
  - minecarts
  - ...
- fluids
  - water (also bubble column with soul sand/magma blocks)
  - lava (also dimension `ultra_warm`)
- flying (creative)
- spectator
  - gamemode
  - and spectating other entities
- death
- entities
  - cramming/pushing
- auto jump
- sleeping
- fishing rod?
- precision loss (high coordinates 20M+)
- world border
- end of world (everything >= 30M)
- abilities (flying, walk speed, fly speed)
- tags
- tags

## Additional entity physics

## Ridable entities

(only client controlled)

- strider (with warped fungus on a stick)
- pig (with carrot on a stick)
- all horses (with controls and jumping)
- boat

## Client calculated

- items
- projectiles
- firework rockets
- fishing bobber

## Non physics things

- client side biome noise
- digging times

## About consistency

Tests are general non-mutable, so a diff is possible between versions.
New tests can/will always be added, existing tests may only be changed if they break or are considered wrong.

Parkour code (attach debugger in `ClientPlayerEntity`, where `getTutorialManager` is called):

```java
"f="+input.pressingForward+",b="+input.pressingBack+",l="+input.pressingLeft+",r="+input.pressingRight+",j="+input.jumping+",sn="+input.sneaking+",sp="+client.options.sprintKey.isPressed()+"  -->   "+getX()+"|"+getY()+"|"+getZ()+"  "+yaw+"|"+pitch
```