RoyTheunissen / Gpu Spline Deformation
Licence: other
Baking spline deformation to a texture then applying it to a mesh via a shader.
Stars: ✭ 52
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Sample for baking deformation to a texture then applying it to a mesh via a shader.
About the Project
I saw Simon Trümpler's Tileable Liquid Mesh on Spline and I was wondering how the mesh was following the spline exactly. It gave me the idea of baking the deformation to a texture somehow, which actually turned out to be really simple.
Getting Started
- Add the package to your Unity project (tips on how to install it are in the Installation section)
- Create the mesh you will be deforming that's pointing in the forward Z axis. Samples are provided.
- Make sure it has a material with the
Deformation Lookup Shadershader. - If the mesh does not start at (0, 0, 0) and stop at (0, 0, 1), adjust the
Z StartandZ Endproperties accordingly.
- Make sure it has a material with the
- Implement the
IDeformationProviderinterface in the script that is responsible for the deformation that you want to bake or use the providedBezierSplinescript. - Add a
DeformationTextureRendererscript to the scene. I recommend adding it next to the mesh you'll be deforming. - Assign the script responsible for the deformation to the Deformation Provider field.
- Assign the material for the mesh that will be deformed (this is necessary for assigning it dynamically created textures)
- You should now see the mesh deform along whatever deformation is provided via the script.
Troubleshooting
- If the mesh is not deforming, check that
Amountis set to 1 in the material. This feature exists for quickly toggling the effect on and off to see what it does. - If the mesh is not deforming, check that it has the right material, shader and texture assigned
- Make sure the correct texture asset and/or material are assigned in the Deformation Texture Renderer
- If you are seeing artifacts or incorrect deformation:
- Make sure the resolution is sufficiently large. Set the mode to Dynamic and try out larger resolutions until the artifacts disappear
- Make sure
Z StartandZ Endare set correctly in the material - Make sure the texture's wrap mode is set to clamp. For looping meshes you may want the X-axis to be set to Repeat
Installation
OpenUPM
The package is available on the openupm registry. It's recommended to install it via openupm-cli.
openupm add com.roytheunissen.gpusplinedeformation
Manifest
You can also install via git URL by adding this entry in your manifest.json
"com.roytheunissen.gpusplinedeformation": "https://github.com/RoyTheunissen/GPU-Spline-Deformation.git"
Unity Package Manager
from Window->Package Manager, click on the + sign and Add from git: https://github.com/RoyTheunissen/GPU-Spline-Deformation.git
Contact
Acknowledgements
- Tileable Liquid Mesh on Spline, Simon Trümpler for the inspiration
- Curves and Splines, Catlike Coding for the spline implementation
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