From 8da3f6267f2a0fe8454dd8ec0b18288c3f56633b Mon Sep 17 00:00:00 2001
From: NullBite <me@nullbite.com>
Date: Thu, 24 Mar 2022 13:10:17 -0400
Subject: [PATCH] Add folder of useful code snippets

---
 code_snippets/physics.lua | 64 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 code_snippets/physics.lua

diff --git a/code_snippets/physics.lua b/code_snippets/physics.lua
new file mode 100644
index 0000000..2da2d4a
--- /dev/null
+++ b/code_snippets/physics.lua
@@ -0,0 +1,64 @@
+--by Bonk#2965
+lastDegree = 0
+function newPhysics(part, crouchTog, amp, onHead)
+	local lerpAmount = 0.96
+	local onHeadd = onHead or false
+	local crouchToggle = crouchTog or false
+	local parte = part
+	local weightReduc = amp or 1
+	--set initial amount
+	local degree = lerp((playerSpeed() *-100),lastDegree,lerpAmount)
+	lastDegree = degree
+	--remove head rotation
+	if onHeadd then
+		degree = degree + getHeadRot()[1]
+	end
+
+	--add crouch rotation
+	if crouchToggle then
+		if player.isSneaky() then
+			degree = degree - 30
+		end
+	end
+
+	--amplify
+	degree = degree * weightReduc
+
+	--whole number-ify
+	degree = math.floor(degree+0.5)
+
+	--set it
+	parte.setRot({degree,0,0})
+end
+
+--assists to the physics
+function lerp(a, b, t) -- smoothing
+	return a + (b - a) * t
+end
+
+function getHeadRot() -- Gets the rotation of the player's head
+	local x = vanilla_model.HEAD.getOriginRot()
+	x = {x[1]*(180/math.pi),x[2]*(180/math.pi),0}
+	return x
+end
+
+playerVelocity = 0
+function player_init()
+	pos = player.getPos()
+	_pos = pos
+	playerVelocity = vectors.of({0})
+end
+function tick()
+	_pos = pos
+	pos = player.getPos()
+	playerVelocity = pos - _pos
+end
+function playerSpeed() -- returns the player's horizontal speed, positive if moving forwards, negative if backwards
+	return (vectors.of({1, 0, 1})*playerVelocity).getLength()*(movingForwards() and 1 or -1)
+end
+
+function movingForwards() -- returns a bool, true if moving forwards, false if moving backwards or stationary
+	local bodyDir = vectors.of({math.sin(math.rad(-player.getBodyYaw())), 0, math.cos(math.rad(-player.getBodyYaw()))}) -- a unit vector pointing the same way as the body
+	local dotProduct = playerVelocity.z*bodyDir.z + playerVelocity.x*bodyDir.x -- the dot product of the velocity vector and a vector pointing the same way as the body
+	return dotProduct > 0
+end