Raycast vehicle suspension not stabilizing

This is a READ-ONLY snapshot of the Godot Community Forums when TwistedTwigleg was the owner, which is hosted for archival reasons only. The current Godot Community Forums can be found here.

Some links may point to external websites, including the current Godot Community Forums. These websites are not associated with TwistedTwigleg.

Raycast vehicle suspension not stabilizing

kirca

I am trying to implement basic arcade like vehicle physics (i.e. Mario Kart, Crash Team Racing, ...) but I am not able to get the suspension working right. I am not using the built-in VehicleBody as that one seems much more complex than what I need and also I would like to extend this to work for motorcycle vehicle types later.

My main inspiration is the approach described in this (

"video") (@2 min.).

That works well but the suspension never stops bouncing so from additional research I found out that there should be a "damper" component to the force calculation. Using the velocity as a countering component seems to be going in the right direction at start, but the spring never stabilizes and the force that accumulates throws of the vehicle completely ((

"video")).

The script that I am using for the raycast suspensions (and test scene) can be seen here.

Any help, hint or feedback whatsoever is highly appreciated!

kirca

I solved it using a combination of suspension specific damping + constant linear and angular damping on the rigid body vehicle. Ideally the damping on the suspension would be enough to stabilize the vehicle and not do that with "global" damping which will affect the driving all the time. I think that the main issue is with the angular velocity but I can't find a way how to include that in the suspension force calculation. The driving feels quite descent though so I guess it will do for now. Anyone interested can check/follow the progress on github.

BigTuna

Hey, so I'm trying to implement something similar using a video by the dev of "Very very valet". I think I got the suspension almost figured out(it does come out of balance sometimes the springs gradually amplify each other but at least In the scenario you show in the video I think my implementation would come to rest). There are two things to note, first make sure you're using the correct offset in add_force() the position needs to take the local rotation into account and the second again concerning rotation, when calculating the velocity for the dampening force make sure to take the angular velocity of the body into account basically use an implementation of "getVelocityAtPoint" in godot I think its body.linear_velocity + body.angular_velocity.cross(offset of wheel position relative to body cg)