Search found 5 matches

by random
Sun Nov 24, 2019 2:49 am
Forum: General Bullet Physics Support and Feedback
Topic: Spring between two dynamic objects
Replies: 1
Views: 687

Re: Spring between two dynamic objects

UPDATE: Apparently it was not the spring that was causing the issue. It was the setting of linear limits on 6DOF constraint. It only happens with some combinations of initial position / pivot point offset / linear range. Once I changed them it was quite difficult to reproduce the problem again. Anyw...
by random
Fri Nov 22, 2019 11:27 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Point cloud, sphere/capsule and sphere/cylinder collisions
Replies: 0
Views: 921

Point cloud, sphere/capsule and sphere/cylinder collisions

Hello, I needed to get collisions between simple shapes (cylinders) and a complex convex dynamic object. Among many things I tried, the easiest solution turned out to represent the surface of the complex object as a point cloud of vertices modeled as spheres of radius 0. As long as (a) distance betw...
by random
Fri Nov 22, 2019 10:05 am
Forum: General Bullet Physics Support and Feedback
Topic: Spring between two dynamic objects
Replies: 1
Views: 687

Spring between two dynamic objects

Greetings, I'm trying to create a spring using either btGeneric6DofSpring2Constraint or btGeneric6DofSpringConstraint and I'm failing miserably. In all the examples I could find one body is always static, and that seems to work fine. As soon as I make both bodies dynamic the whole thing just spins l...
by random
Mon Feb 11, 2019 12:04 pm
Forum: General Bullet Physics Support and Feedback
Topic: Best way to do cam/roller collision?
Replies: 0
Views: 844

Best way to do cam/roller collision?

Hello, What would be the most appropriate way to implement cam / cam follower collision? Cam is a (possibly concave) prism and follower is a cylinder. I do not expect top/bottom collisions, only side to side. See pic here: https://pybullet.org/Bullet/phpBB3/viewtopic.php?f=9&t=12591 There is going t...
by random
Fri Jan 25, 2019 1:39 pm
Forum: General Bullet Physics Support and Feedback
Topic: Accurate simulation of complex mechanical system
Replies: 1
Views: 911

Accurate simulation of complex mechanical system

Hello, I'd like to simlate a complex mechanical system (a kind of clockwork automaton, lots of gears, cams and levers). I already have some code to generate shapes for 3D printing using constructive geometry (OpenCascade/PyOCC). Ideally I would like to take the output of that and feed it into simula...