How to reference contact point response variables?

Questions
#1

I’m trying to have my player character interact differently with different collision groups and collision objects at specific locations, but i’m not sure how to reference the variables in “contact_point_response” such as on the line of code below so that I can code different responses.
image
How do I do this?

#2

just use the collision group name

if message_id == hash("contact_point_response") then
  if message.other_group == hash("groupname") then -- change groupname
    ...
  end
end
1 Like
#3

Do you know how I would specify the location of the collision object?
At the moment i’m specifying the location of the player but I feel that in some cases it would be easier to specify the location of the collision object tile itself.

#4

quick and easy :slight_smile:

message.other_position

#5

With message.other_position, what would the location be for my tiles?
Would it register the center or anywhere within the 16x16 tile?

#6

No, other_position will not give you the tile, but the position of the entire tilemap component. You can easily calculate it though:

local TILE_SIZE = 16

function on_message(self, message_id, message, sender)
	if message_id == hash("contact_point_response") then
		local tx = math.floor((message.position.x - message.other_position.x) / TILE_SIZE)
		local ty = math.floor((message.position.y - message.other_position.y) / TILE_SIZE)
		print(tx, ty)
	end
end

You may need to offset tile by 1. Try it yourself and see!

3 Likes