add lerp function to util and lerp method to vector3

data/scripts/types/vector3.lua

@@ -216,6 +216,25 @@ end
 function Vector3:copy()
   return Vector3(self)
 end
+
+---Returns a new vector as a linear interpolation between self and b.
+---@param b vectorlike
+---@param t number
+---@return Vector3
+function Vector3:lerp(b, t)
+  -- return self:copy()
+  if not is_weak_vector3(b) then
+    error("Vector3: b must be a Vector3-like table. Returning copy of self.")
+    return self:copy()
+  end
+  local w = Vector3(b)
+  return Vector3{
+    util.lerp(self.x, w.x, t),
+    util.lerp(self.y, w.y, t),
+    util.lerp(self.z, w.z, t),
+  }
+end
+
 ---- CONSTANTS
 
 Vector3.UP = Vector3(0, 1, 0)

data/scripts/util.lua

@@ -97,4 +97,24 @@ function util.list_insert_once(t, value)
   if util.list_find(t, value) ~= -1 then return end
   table.insert(t, value)
 end
+
+---linear interpolation
+---@param a number
+---@param b number
+---@param t number in [0, 1]
+---@return number
+function util.lerp(a, b, t)
+  return a + t * (b - a)
+end
+
+---constrains v between min and max
+---@param v number
+---@param min number
+---@param max number
+---@return number
+function util.clamp(v, min, max)
+  return math.max(math.min(v, max), min)
+end
+
+
 return util