Problem with collision

chicogamedev

Hi,

I'm new to Godot and I'm trying to create a little project just to start familiarizing with the engine.

In the .zip file attached there is the actual project I'm talking about.

It's very basic but I can't get the collision to work between a kinematic body and a static body.

There are some special things going on like Ground.gd that is a class extending from StaticBody2D. I instantiate them in the Game.gd script.

My player is the kinematic body and I'm using move_and_slide() to move it. I'm for sure missing something but what ?

If you activate the debug option "Visible collision shapes" everything is in the right place...

Please can someone help me ? I'm loosing my mind on this issue.

Thanks in advance, Godot is amazing.

Regards, Chico

TwistedTwigleg

I downloaded the project and found a solution, though I'm not totally sure how the solution fixes the issue or why it does.

The issue is on line 32: shape.extents = Vector2((offset / 2) * size, offset / 2) After some debugging, I decided to place a normal RigidBody2D node in the Game scene to see how it would react, and it only collided with the bottom of the platform. It would go through the top and stop at the bottom edge. After some messing around, I realized that the collision shape seems to think it is inside out.

After some more debugging I was able to, more or less, confirm this is the case and fix the issue by changing line 32 to the following: shape.extents = Vector2((offset / 2.0) * size, -offset / 2.0). After that, everything works as expected, though I'm not sure why using a positive value for the Y makes it inside out...

Anyway, hopefully this helps! (Side note: Welcome to the forums!)

Megalomaniak

Probably inverted normals on the collision mesh?

TwistedTwigleg

It might be, and that would explain the behavior. I didn't think to check and see what the returned normal vectors were.

chicogamedev

Thank you TwistedTwigleg for the incredibly fast answer !

It's really interesting I was thinking about something similar but had no idea of the possible correction.

It's working and it's great !

Thanks for help.