Sprite doesn't update position immediately

Bugs
1

I have a gameobject with 2 sprites on it. When I move the object sprite 1 is active when the object is stationary sprite 2 will be shown. When I enable sprite 2 the image will first show itself in the last postion it was active for one frame, and then teleport to the right position (where the gameobject is). How can I solve this problem?

2

I’m trying to reproduce your problem but I don’t see any error. Maybe I misunderstand what you do. Here’s what I tried:

  1. I created a game object with two sprites, “sprite1” and “sprite2”.
  2. I create a script component for the game object.

Script code:

function init(self)
	self.t = 0
	self.x = false
	go.set_position(vmath.vector3(100, 100, 0))
end

function update(self, dt)
	self.t = self.t + dt
	
	if self.t > 1 then
		if self.x then
			msg.post("#sprite2", "enable")
			go.set_position(vmath.vector3(100, 100, 0))
		else
			msg.post("#sprite2", "disable")
			go.set_position(vmath.vector3(200, 100, 0))
		end
		self.x = not self.x		
		self.t = 0
	end
end

If I understand your problem correctly “sprite2” would appear in the wrong place for 1 frame each second, but I don’t see that happening.

3

That’s almost what I’m trying to do. Although you seem to always have the sprite2 visible at (100, 100) location. Sprite 2 is never active at the (200, 100) location.

Maybe try reversing the order of these lines:
msg.post("#sprite2", “disable”)
go.set_position(vmath.vector3(200, 100, 0))

*Tried some version of it and couldn’t replicate.

4

Manage to replicate it with the following code:

function init(self)
self.t = 0
self.x = false
go.set_position(vmath.vector3(100, 100, 0.5))
msg.post("#sprite1", “disable”)
end

function update(self, dt)
self.t = self.t + dt

if self.t > 3 then
	if self.x then
		go.set_position(vmath.vector3(100, 100, 0.5))
		msg.post("#sprite1", "disable")
		msg.post("#sprite2", "enable")
		msg.post("#sprite2", "play_animation", {id = hash("anim")})
	else
		go.set_position(vmath.vector3(200, 100, 0.5))
		msg.post("#sprite1", "disable")
		msg.post("#sprite2", "enable")
		msg.post("#sprite2", "play_animation", {id = hash("anim")})
	end
	self.x = not self.x		
	self.t = 0
end

end

function on_message(self, message_id, message, sender)
if message_id == hash(“animation_done”) then
msg.post("#sprite1", “enable”)
msg.post("#sprite2", “disable”)
end
end

5

Can you share your project with me because I can’t replicate with your code?

6

Sure, how do I share my project?

7

Just add me to it in the dashboard. My mail is mikael@sicher.org

Make sure you have synced so I get everything I need.

8

So, you should be invited.
You should just have to build and play and you will get to a examplescene when you can observe the bugg

9

Ah, you sent me an invite. You need to add me to the project. Click on the project link and add my mail at the bottom of the “Members” list.

1 Like
10

Thanks. I see the issue here. Will investigate a bit.

11

We’ve looked at the issue and it is definitely a bug. Unfortunately have have no workaround at the moment but this needs to be fixed. I’m filing a bug report.

EDIT: This seems to only happen if you enable the sprite on the “animation_done” message.

Thanks for the find!

1 Like