Collision with a rotating rigidbody2d

mrpix

Hello,
Sorry if this is a beginner's question. Despite my research on the internet and on Godot's api, I can't find an answer to this problem. I have placed an "elice" (Rigidbody2d) on the stage and I would like to rotate it while keeping its position fixed.
But when I put the code "position = Vector2(200,200)" collision points appear abnormally, whereas if I put this code as a comment the physics reacts normally.
Could you please tell me which parameter to check?
Thank you for your help!

mrpix

The issue seems to be: "position = Vector2(200,200)" because thanks to another test I can see that if this line is active there are no collisions between the ball and the elice.
I must not be using the right method to keep a rigidbody2d in a fixed position

mrpix

After more research, it seems that RigidBody2D can't be set via position, it interferes with the physics simulation.
So I have to find the way to make it immobile with forces
I keep digging ^^

mrpix

So I managed to make it work by changing the elice's gravity scape to 0 and the Mass to 65535 (So it doesn't move if it's pushed by a ball).
I'll be very interested if pros could tell me if there are more elegant ways ^^
Thx

Nerdzmasterz

So you want the object to spin without it changing directions as it bounces? You could spin the sprite instead of the whole rigidbody.

cybereality

You have to let the physics engine handle everything. Once you have a physics body, if must be moves through physics functions, not by manually setting the position. What you want to use is a PinJoint to lock the body to a position, they you can spin it around however you like.

mrpix

Thanks for your answers!
Pinjoint2D is exactly what I was looking for 👍️
For those who are just starting out like me and who need an explanation, here is a good tutorial

cybereality

Awesome! So happy I could help,