gpuopen-effects/femfx

AMD FEMFX v0.1.0

FEMFX is a multithreaded CPU library for deformable material physics, using the Finite Element Method (FEM). Solid objects are represented as a mesh of tetrahedral elements, and each element has material parameters that control stiffness, how volume changes with deformation, and stress limits where fracture or plastic (permanent) deformation occur. The model supports a wide range of materials and interactions between materials. We intend for these features to complement rather than replace traditional rigid body physics. The system is designed with the following considerations:

• Fidelity: realistic-looking wood, metal, plastic, even glass, because they bend and break according to stress as real materials do.
• Deformation effects: non-rigid use cases such as soft-body objects, bending or warping objects. It is not just a visual effect, but materials will resist or push back on other objects.
• Changing material on the fly: you can change the settings to make the same object behave very differently, e.g., turn gelatinous or melt
• Interesting physics interactions for gameplay or puzzles

The library uses extensive multithreading to utilize multicore CPUs and benefit from the trend of increasing CPU core counts.

Included in this release

• Source code for FEMFX library
• Houdini plugin for content creation
• Sample code for loading and preprocessing content for rendering
• Sample threading utilities
• A basic graphical sample

In a separate release, we provide a plugin for Unreal Engine that demonstrates more advanced rendering of FEM objects. Instructions for access are here: https://github.com/GPUOpen-LibrariesAndSDKs/GameEngineIntegrations

• Plugin: https://github.com/GPUOpenSoftware/UnrealEngine/tree/FEMFX-4.18
• Demo: https://github.com/GPUOpenSoftware/UnrealEngine/tree/FEMFX-AlienPods

Dependencies The sample code has some dependencies on external frameworks which must be downloaded separately:

• JSON for Modern C++: https://github.com/nlohmann/json
• GLFW: https://www.glfw.org/download.html

System requirements

• AMD Ryzen™ 7 2700X Processor or equivalent
• Windows® 10
• Visual Studio 2017 or Visual Studio 2019

Files:

1. Documentation
   • amd_femfx\docs\
2. Library
   • amd_femfx\inc\ : Public API (Look first at AMD_FEMFX.h)
   • amd_femfx\src\ : Implementation files
3. Sample code
   • samples\FEMFXViewer\ : Basic sample; displays tetrahedral meshes and debug information
   • samples\common\TestScenes.*: Setup for tech demo scenes used by FEMFXViewer
   • samples\common\FemResource.* : Container for the data loaded from a .FEM file
   • samples\common\LoadFem.*: Code for parsing a .FEM and loading into an FEMResource
   • samples\common\RenderTetAssignment.* : Assigns rendering mesh vertices to tetrahedra for skinning
   • samples\ExampleRigidBodies\ : Basic demonstration of interfacing an external rigid body system with FEMFX library
   • samples\sample_task_system\ : Sample task system library interfaced with FEMFX
4. Houdini plugin for content creation
   • houdini16.5\AMD_FEM_Assets.otl
5. External dependencies
   • external\glfw\ : Path to install GLFW for viewer; can download Windows pre-compiled binaries from https://www.glfw.org/download.html
   • external\json-develop\ : Path to install json parser used in LoadFemFile.*; can download from https://github.com/nlohmann/json
6. Some individual components
   • amd_femfx\inc\Vectormath\ : 3D vector/matrix math
   • amd_femfx\src\PrimitiveCollision\ : Triangle and box collision operations, intersection and CCD
   • amd_femfx\src\Common\FEMFXSvd3x3.* : 3x3 SVD
   • amd_femfx\src\Threading\ : Async parallel-for and task graph support
   • samples\sample_task_system\TL* : Async task system implementation

femfx's Issues

how to make .FEM meshes without houdini.

Hey there,

is it possible for you guys to make a tutorial on how to make .FEM models on Blender
i am currently able to open the project but i cannot seem to be able to make any meshes

FEMFX Unreal Engine 5 port

Hey guys, I was wondering if anyone was able to use FEMFX in Unreal Engine 5?

Samples for Unity Engine?

Are there any available samples for Unity?

Could it be used to other CPUs?

use to Arm or ...

readme UE4 branch link 404 error

As title states, the link to the unreal engine 4 plugin branch isn't working anymore.
May I say fantastic looking plugin, can't wait to play with this!
Thanks for your efforts.

Cannot make it work on 4.25 neither 4.18.3

when starting the project i get the following screens:

this when i start it up:

and after i accept it this happens:

can some1 help me with this please

Compatibility with Linux or OSX ?

Hi,

Before digging into the code I wanted to know if there is a known limitation on OSX or Linux, does the code depend on windows specific libraries?

Thanks

FEMFX Viewer crashes with illegal instruction

Compiled with lastest master branch and latest build of GLFW (3.3). I think it's a library mismatch problem. Which version of the external libraries must be used?

TestScenes Assets

Hello, is it possible to get the assets for the "TestScenes.cpp" for example:

• car-body-tets
• car-hood-tets
• tractor_tire_tets.1
• materialblock.1
• duck.1.node
• duck.1.ele

There are quite a few files not just the ones I listed... I guess they are node and ele extensions?

Plugin for Unreal Engine with linked GitHub account is not available (EM: 404)

I followed the below guide on how to link UE with my GitHub account, and after receiving a confirmation email about successful linkage, the UE plugin and demo is still hidden/unavailable.

https://www.unrealengine.com/en-US/ue4-on-github

On GPUOpen, the below is stated:
"The Unreal Engine plugin is available here https://github.com/GPUOpenSoftware/UnrealEngine/tree/FEMFX-4.18. This link will only work for those with access permissions to the UE4 repository."

Samples for Unreal Engine?

Where can I find samples scene of code usage in the Unreal ENgine engine?

wish for a try page

Source code of the Houdini plugin

I was wondering if there's any chance to release the source code of the Houdini plugin to tinker with. This project is very promising, but as it stands, I see no simple way of generating .fem metadata without using Houdini, and even using Houdini I found it very difficult to import and export simple arbitrary models for testing in UE4.

Are there plans to create other methods to create content for UE4? Perhaps a plugin for either a free alternative such as Blender or perhaps a tool to create content from within UE4? Can someone explain what the general goal is of this project and if there are people who have created content other than the developers, and have succesfully imported it into UE4? I would love to hear from you.

Is it possible to combine Plasticity & Fracture?

I'm looking for a solution to implement the simplest metal deformation with the following tearing. Is it possible to implement with this library? Does anyone know how to implement sush behaviour with MATERIAL_DEMO_SCENE (rectangular panel)?

Ex.: Projectile holes, explosion deformation, rope/resin tearing

Does the library work with c++14?

I saw it had parallel for loops and that is a c++17 feature.

Is FEMFX dead?

Can we expect any further development on FEMFX?

How to do raycasting?

Hi, thanks for this library! I'm writing a basic game engine, and was trying to figure out how to do raycasting. I couldn't find a method for this like PhysX's PxScene::raycast. Do you have recommendations on how to implement that method with this library?