Hello guys… help me with this question.
My GO has two object colision. one at top another at bottom. when i use pprint to check the sent value I got
[main:/instance1#collisionobject]
so i need to compare the values, I do this:
if sender == hash(<????>) then ... end
in this case which value i need to put in <????> to check wich component receive the colission?
It is an URL so if sender.path == hash("/instance1") should work.
but this is the problem…
“/instance1"
”/instance1"
"…"
"/instance10"
is is automatically generated by the factory
how to handle with is?
“/instance??#collisionobjectTOP”
"/instance??#collisionobjectBOTTOM"
Hello @jhonatanvinicius,
Remember that all objects can send and receive messages, so in your case, your player is receiving a collision message in the format that you are describing: “/instance??#collisionobjectTOP”, BUT your other object can also detect the collision and send a message identifying itself, something like (pseudocode):
other object on_message(...)
if message == contact_point
msg(player_url, "I_GOT_YOU", { id = go.get_id() } )
And then your player object would have to listen for these messages:
player object on_message(...)
if message == "I_GOT_YOU"
receive_damage_from(message.other_id)
OR
Another case would be to use only the fragment portion from the sender (sender is an url) so you get the collision that was hit “#collisionobjectTOP” or “#collisionobjectBOTTOM” without taking in consideration who sent it:
player object on_message(...)
if message == contact_point
if sender.fragment == #collisionobjectTOP then
-- receive top damage
else if sender.fragment == #collisionobjectBOTTOM then
-- receive bottom damage
end
Hope this helps
wow i believe that now will work. This option(sender.fragment) it is new for me. when at home i will test. thanks.
Nice,
You see, url’s have 3 parts: socket, path and fragment.
You can read more about it in the defold msg.url documentation
Ok,
I think it is pretty easy, you have to do something like (pseudocode):
player object on_message(...)
if message_id == contact_point
if sender = url("footgirl")
-- receive foot damage here
Might find this helpful too,
if message_id == hash("contact_point_response") then -- check if we received a contact point message
if message.group == hash("foot_girl") then -- check that the object is something we consider geometry
handle_geometry_contact(self, message.normal, message.distance)
end
end
and change it’s group to foot_girl
Hey @Davej ,
Yours is a good idea too, to use:
message.group == hash("foot_girl")
instead of:
sender == msg.url("foot_girl")
but @jhonatanvinicius would have to change his game objects and collision objects, doesn’t he?
HEllo @Edgaronfo and @Davej.
I have tst your hints but didn’t work…
see my test details…
if message_id == hash("contact_point_response") then
if message.group == hash("hero") then
pprint("+++++++ begin test")
pprint("footgirl as url: " .. msg.url("footgirl"))
pprint("message sender: " .. sender)
pprint("message id: " .. message_id)
if sender == msg.url("footgirl") then -- check edga hint
print('OK to URL')
end
if message.group == hash("footgirl") then -- check dajev hint
print('OK to group')
end
pprint(" === start message info")
pprint(message)
pprint(" === end message info")
pprint("+++++++ end test")
end
end
and this is my console response:
DEBUG:SCRIPT: +++++++ begin test
DEBUG:SCRIPT: footgirl as url: [main:/footgirl]
DEBUG:SCRIPT: message sender: [main:/instance1#collisionobject]
DEBUG:SCRIPT: message id: [contact_point_response]
DEBUG:SCRIPT: === start message info
DEBUG:SCRIPT:
{
normal = vmath.vector3(0, -1, 0),
position = vmath.vector3(220.70994567871, 70.166679382324, 0),
other_position = vmath.vector3(237.7099609375, 120.5647354126, 0.30000001192093),
relative_velocity = vmath.vector3(0, 0, 0),
other_id = hash: [/hero],
other_mass = 0,
group = hash: [hero],
applied_impulse = 0,
distance = -0.66667795181274,
life_time = 0,
mass = 0,
}
DEBUG:SCRIPT: === end message info
DEBUG:SCRIPT: +++++++ end test
my hero GO
my dino go
any ideas?
Hello my friend! I don’t know if I really understand what do you want to do, but I have this piece of code that helps me a lot…
I put this inside the script attached to the factory, in your case, I think it’s the dino script:
this_id = tostring(go.get_id())
this_id = this_id:sub(8, -2)--hash: [/]
Sorry if isn’t what you are looking for…
I wouldn’t rely on string operations, since the strings won’t be available in release builds.
A few things:
You need to change the group of the hero collision object foot_girl to foot_girl, if you want to check different collisions objects on the same game object, they must belong to different groups, else all collisions will be checked under the same group
Yes @Edgaronfo, thats right, but at least then you can check for a specific collision, if he wants to still use that area under hero, he can always place another collision object int the same area and call it hero still.
Ok,
In this specific case, your dino is checking for the hero, and NOT the hero for the dino, so the collisions that will be sent as sender will be you dino’s, that is why you receive “collisionobject” as your sender.
So if you want to know if you hero’s feet got bitten, you have to put code in your hero’s script, then you will be able to receive the hero’s collisions as senders.
Try this in your hero.script:
if message_id == hash("contact_point_response") then
if message.group == hash("dino") then
print("message sender: " .. sender)
and your result will be something like:
DEBUG:SCRIPT: message sender: [main:/hero#foot_girl]
yeah it is working now!!!
you are right! @Edgaronfo.
I have learned a important thing about collisionObject today. here is may error:
I was trying “teach” to dino when he should die… but defolt dont tell to receiver the id of other collision object. basically a GO/script has access only to own object collisions.
Now this is my information path:
1 - in girl i check if sensor foot make contact with dino…
2 - so i send a message to dino with command “die”
3 - the dino receive the command and send a return message to girl telling his coordinates Y and starts his die animation
4 - the girl receives the message with coordinate and start to jump from dino’s head.
Really thanks for all help, guys.
