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InteractiveComputerGraphics / PositionBasedDynamics

PositionBasedDynamics is a library for the physically-based simulation of rigid bodies, deformable solids and fluids.
MIT License
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The difference between Flex and this work #105

Closed lyd405121 closed 2 years ago

lyd405121 commented 2 years ago

I have learned a lot from this repository and your paper, and I want to implement this repository fully on gpu . Recent days, I am learning the Flex engine and Matthias Müller's《Ten Minute Physics》 Here's my video about my work: ik

Here is the difference I found in rigidbody simulation between this repository and Flex:

In this repository : model files(ply) → aabb(or kdtree) → collision detect → conact found → sovle constraint

And in Flex: model files(ply) → particle(discretization, like sdf) → invisible(because Flex is not open source project)

So, the rigidboy simuliton in this repository don't include any particles, just vertex from the model files. Is that right? I guess you and Matthias Müller, Miles Macklin are old friends, maybe you know well about the Flex engine :)

korzen commented 2 years ago

The Unified Particle Physics for Real-Time Applications paper explains how Flex works internally

janbender commented 2 years ago

In this paper they explain that they sample the rigid bodies with particles and then use shape matching to simulate the rigid bodies. In contrast our library uses a proper rigid body model as described (for example) here: https://animation.rwth-aachen.de/publication/0513/