Multiple Demo Changes

Signed-off-by: Robear Selwans <robear.selwans@outlook.com>

scripts/demo/gravitygun.lua

@@ -0,0 +1,50 @@
+-- Parameters
+this.held = nil 
+this.held_distance = 0
+this.rigidness = 0.2
+this.distance_change_speed = 0.1
+this.speed_factor = 5.0
+
+-- this.on_init = function()
+-- end
+
+this.vec_mag = function(v)
+  return (v.x^2 + v.y^2 + v.z^2) ^0.5
+end
+
+this.vec_lerp = function(v1,v2,t)
+  return v1 * (1-t) + v2 * (t)
+end
+
+this.check_inputs = function()
+  if Input.getMouseButtonJustPressed(0) then
+    hit = rayCast(this.worldPosition, this.forward, 3000)
+    if(hit.hasHit) then
+      this.held = hit.object
+      this.held_distance = this.vec_mag(hit.object.worldPosition - this.worldPosition)
+    end
+  end
+
+  if Input.getMouseButtonJustReleased(0) then
+    this.held = nil
+  end
+
+  if Input.getMouseButtonDown(3) then
+    this.held_distance = this.held_distance + this.distance_change_speed
+  end
+
+  if Input.getMouseButtonDown(4) then
+    this.held_distance = this.held_distance - this.distance_change_speed
+  end
+end
+
+this.on_update = function()
+  this.check_inputs()
+
+  if this.held then
+    target_position = this.worldPosition + this.forward * this.held_distance
+    -- this.held.position = this.vec_lerp(this.held.position, target_position, this.rigidness)
+    rb = this.held:getComponent(Rigidbody)
+    rb:setVelocity((target_position - this.held.worldPosition) * this.speed_factor)
+  end
+end