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https://github.com/nixon-voxell/GPUClothSimulationInUnity

Trying to replicate what this legend did: https://youtu.be/kCGHXlLR3l8
https://github.com/nixon-voxell/GPUClothSimulationInUnity

cloth cloth-simulation compute-shader compute-shaders gpu-accelerated-library gpu-cloth-simulation gpu-computing pbd position-based-dynamics

Last synced: 2 months ago
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Trying to replicate what this legend did: https://youtu.be/kCGHXlLR3l8

Lists

README 

        
GPU Cloth Simulation For Real-time Application

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This repository is still currently under development, so everything is still in testing mode. A lot of things will break, download at your own risk :/



> *Disclaimer: This project is in a paused state so there won't be more updates. In the future, if there are any changes to this project, I will post an issue update on this repository. Stay tune!*



My goal is to replicate what this legend did: https://youtu.be/kCGHXlLR3l8 (A smooth and interactive cloth simulation)



Currently, my cloth simulation uses Postion Based Dynamics and supports:

- Distance Constraint

- Bending Constraint

- Point Triangle Distance Constraint (Self Collision)

- Aerodynamics (Wind Effect)



Features comming soon:

- Vivace Gauss Seidel Method for optimization on GPU (random graph coloring)

- Primitive Shape Collision (Sphere, Box and Capsule)



Check out my [YouTube Playlist](https://www.youtube.com/playlist?list=PLlnBGPe6GFdP8So9oS0YVoVjqkmJoREI_) where I record my journey on how I approach this problem!



Support me on [Patreon](https://www.patreon.com/voxelltech) so that I can allocate more time to work on this project!



How to use?

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*Note: The GPU version is not fully developed yet, this tutorial section will not work for the GPU version.

1. Create a mesh in [Blender](https://blender.org) that you want to simulate.

2. Use my custom Blender Addon - [Blender Mesh to JSON](https://github.com/voxell-tech/BlenderMeshToJSON) to transform your mesh into PBD form and export it into your Unity's `StreamingAssets` folder.

3. Create an empty GameObject in Unity.

4. Drag and drop `CPUClothSimulation.cs` or `GPUClothSimulation.cs` script onto the GameObject. (Check [Cloth Configurations](#cloth-configurations) for more cloth parameters' information.)

5. Select the correct JSON file that the Blender Cloth Exporter Tool exports using the button - `Select JSON File`.

6. Press the button - `Load Data from JSON`.

7. Put in your `Front Material` and `Back Material`.

8. Press `Build Mesh` to build the mesh that you have modeled in Blender.

9. Press `Create Back Side` to build the other side of the mesh.

10. Press `Apply Materials` to apply materials on both sides.



Cloth Configurations

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These are the similar parameters in both CPU and GPU Cloth Simulation:



![Materials](./Pictures/materials.PNG)



This determines the front material and back material for the cloth.



![ClothSimParam](./Pictures/cloth_simulation_parameters.PNG)



Tweak these parameters to change the behaviour for the cloth.

1. Gravity: Constant acceleration.

2. Compression Stiffness: Coefficient for distance constraint when 2 particles are too close together.

3. Stretch Stiffness: Coefficient for distance constraint when 2 particles are too far away.

4. Bending Stiffness: Coefficient for bending constraint when 2 neighbor triangles are not at their rest angle.

5. Thickness: Cloth thickness for all collisions.

6. Damping: Multiplier of velocity for every simulation to reduce velocity (as air resistance).



![Simulation](./Pictures/simulation.PNG)



Tweak these parameters to balance between accuracy and performance.

1. Iteration Steps: Number of iterations to solve constraints for every simulation.

2. Delta Time Step: Time pass between 2 simulations.

3. Start Simulation On Play: Choose if you want to start the simulation once you enter play mode.



License

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This project is under MIT License.