Filament

Filament is a real-time physically based rendering engine for Android, iOS, Linux, macOS, Windows,
and WebGL. It is designed to be as small as possible and as efficient as possible on Android.

Download

Download Filament releases to access stable builds.
Filament release archives contains host-side tools that are required to generate assets.

Make sure you always use tools from the same release as the runtime library. This is particularly
important for matc (material compiler).

If you'd rather build Filament yourself, please refer to our build manual.

Android

Android projects can simply declare Filament libraries as Maven dependencies:

repositories {
    // ...
    mavenCentral()
}

dependencies {
    implementation 'com.google.android.filament:filament-android:1.4.5'
}

Here are all the libraries available in the group com.google.android.filament:

• filament-android: the Filament rendering engine itself
• gltfio-android: a glTF 2.0 loader for Filament, depends on filament-android
• filament-utils-android: KTX loading, Kotlin math, and camera utilities, depends on gltfio-android
• filamat-android-full: a runtime material builder/compiler. This library is large but contains
  a full shader compiler/validator/optimizer
• filamat-android-lite: a much smaller alternative to filamat-android-full that can only
  generate OpenGL shaders. It does not provide validation or optimizations

Snapshots

If you prefer to live on the edge, you can download a continuous build by following the following
steps:

1. Find the commit you're interested in.
2. Click the green check mark under the commit message.
3. Click on the Details link for the platform you're interested in.
4. On the top right, click on the Artifacts dropdown and choose an artifact.

Documentation

• Filament, an in-depth explanation of
  real-time physically based rendering, the graphics capabilities and implementation of Filament.
  This document explains the math and reasoning behind most of our decisions. This document is a
  good introduction to PBR for graphics programmers.
• Materials, the full reference
  documentation for our material system. This document explains our different material models, how
  to use the material compiler matc and how to write custom materials.
• Material Properties, a reference
  sheet for the standard material model.

Examples

Materials

Here are a few sample materials rendered with Filament:

Applications

Here are a few screenshots of applications that use Filament in production:

Google Maps AR Navigation

Google Search 3D/AR Viewer on Android

Features

APIs

• Native C++ API for Android, iOS, Linux, macOS and Windows
• Java/JNI API for Android, Linux, macOS and Windows
• JavaScript API

Backends

• OpenGL 4.1+ for Linux, macOS and Windows
• OpenGL ES 3.0+ for Android and iOS
• Metal for macOS and iOS
• Vulkan 1.0 for Android, Linux, macOS, and Windows
• WebGL 2.0 for all platforms

Rendering

• Clustered forward renderer
• Cook-Torrance microfacet specular BRDF
• Lambertian diffuse BRDF
• HDR/linear lighting
• Metallic workflow
• Clear coat
• Anisotropic lighting
• Approximated translucent (subsurface) materials
• Cloth shading
• Normal mapping & ambient occlusion mapping
• Image-based lighting
• Physically-based camera (shutter speed, sensitivity and aperture)
• Physical light units
• Point lights, spot lights and directional light
• Screen-space ambient occlusion
• Screen-space refraction
• HDR bloom
• ACES-like tone-mapping
• Temporal dithering
• FXAA, MSAA and specular anti-aliasing
• Dynamic resolution (on Android and iOS)

Rendering with Filament

Native Linux, macOS and Windows

You must create an Engine, a Renderer and a SwapChain. The SwapChain is created from a
native window pointer (an NSView on macOS or a HWND on Windows for instance):

Engine* engine = Engine::create();
SwapChain* swapChain = engine->createSwapChain(nativeWindow);
Renderer* renderer = engine->createRenderer();

To render a frame you must then create a View, a Scene and a Camera:

Camera* camera = engine->createCamera();
View* view = engine->createView();
Scene* scene = engine->createScene();

view->setCamera(camera);
view->setScene(scene);

Renderables are added to the scene:

Entity renderable = EntityManager::get().create();
// build a quad
RenderableManager::Builder(1)
        .boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
        .material(0, materialInstance)
        .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, vertexBuffer, indexBuffer, 0, 6)
        .culling(false)
        .build(*engine, renderable);
scene->addEntity(renderable);

The material instance is obtained from a material, itself loaded from a binary blob generated
by matc:

Material* material = Material::Builder()
        .package((void*) BAKED_MATERIAL_PACKAGE, sizeof(BAKED_MATERIAL_PACKAGE))
        .build(*engine);
MaterialInstance* materialInstance = material->createInstance();

To learn more about materials and matc, please refer to the
materials documentation.

To render, simply pass the View to the Renderer:

// beginFrame() returns false if we need to skip a frame
if (renderer->beginFrame(swapChain)) {
    // for each View
    renderer->render(view);
    renderer->endFrame();
}

For complete examples of Linux, macOS and Windows Filament applications, look at the source files
in the samples/ directory. These samples are all based on samples/app/ which contains the code
that creates a native window with SDL2 and initializes the Filament engine, renderer and views.

Java on Linux, macOS and Windows

After building Filament, you can use filament-java.jar and its companion filament-jni native
library to use Filament in desktop Java applications.

You must always first initialize Filament by calling Filament.init().

You can use Filament either with AWT or Swing, using respectively a FilamentCanvas or a
FilamentPanel.

Following the steps above (how to use Filament from native code), create an Engine and a
Renderer, but instead of calling beginFrame and endFrame on the renderer itself, call
these methods on FilamentCanvas or FilamentPanel.

Android

See android/samples for examples of how to use Filament on Android.

You must always first initialize Filament by calling Filament.init().

Rendering with Filament on Android is similar to rendering from native code (the APIs are largely
the same across languages). You can render into a Surface by passing a Surface to the
createSwapChain method. This allows you to render to a SurfaceTexture, a TextureView or
a SurfaceView. To make things easier we provide an Android specific API called UiHelper in the
package com.google.android.filament.android. All you need to do is set a render callback on the
helper and attach your SurfaceView or TextureView to it. You are still responsible for
creating the swap chain in the onNativeWindowChanged() callback.

iOS

See ios/samples for examples of using Filament on iOS.

Filament on iOS is largely the same as native rendering with C++. A CAEAGLLayer or CAMetalLayer
is passed to the createSwapChain method. Filament for iOS supports both OpenGL ES and Vulkan via
MoltenVK.

Assets

To get started you can use the textures and environment maps found respectively in
third_party/textures and third_party/environments. These assets are under CC0 license. Please
refer to their respective URL.txt files to know more about the original authors.

How to make contributions

Please read and follow the steps in CONTRIBUTING.md. Make sure you are
familiar with the code style.

Directory structure

This repository not only contains the core Filament engine, but also its supporting libraries
and tools.

• android: Android libraries and projects
  • filamat-android: Filament material generation library (AAR) for Android
  • filament-android: Filament library (AAR) for Android
  • gltfio-android: Filament glTF loading library (AAR) for Android
  • samples: Android-specific Filament samples
• art: Source for various artworks (logos, PDF manuals, etc.)
• assets: 3D assets to use with sample applications
• build: CMake build scripts
• docs: Documentation
  • math: Mathematica notebooks used to explore BRDFs, equations, etc.
• filament: Filament rendering engine (minimal dependencies)
• ide: Configuration files for IDEs (CLion, etc.)
• ios: Sample projects for iOS
• java: Java bindings for Filament libraries
• libs: Libraries
  • bluegl: OpenGL bindings for macOS, Linux and Windows
  • bluevk: Vulkan bindings for macOS, Linux, Windows and Android
  • filabridge: Library shared by the Filament engine and host tools
  • filaflat: Serialization/deserialization library used for materials
  • filagui: Helper library for Dear ImGui
  • filamat: Material generation library
  • filameshio: Tiny filamesh parsing library (see also tools/filamesh)
  • geometry: Mesh-related utilities
  • gltfio: Loader and optional pipeline for glTF 2.0
  • ibl: IBL generation tools
  • image: Image filtering and simple transforms
  • imageio: Image file reading / writing, only intended for internal use
  • matdbg: DebugServer for inspecting shaders at run-time (debug builds only)
  • math: Math library
  • rays: Simple path tracer used for baking ambient occlusion, etc.
  • utils: Utility library (threads, memory, data structures, etc.)
• samples: Sample desktop applications
• shaders: Shaders used by filamat and matc
• third_party: External libraries and assets
  • environments: Environment maps under CC0 license that can be used with cmgen
  • models: Models under permissive licenses
  • textures: Textures under CC0 license
• tools: Host tools
  • cmgen: Image-based lighting asset generator
  • filamesh: Mesh converter
  • glslminifier: Minifies GLSL source code
  • matc: Material compiler
  • matinfo Displays information about materials compiled with matc
  • mipgen Generates a series of miplevels from a source image
  • normal-blending: Tool to blend normal maps
  • resgen Aggregates binary blobs into embeddable resources
  • roughness-prefilter: Pre-filters a roughness map from a normal map to reduce aliasing
  • skygen: Physically-based sky environment texture generator
  • specular-color: Computes the specular color of conductors based on spectral data
• web: JavaScript bindings, documentation, and samples

License

Please see LICENSE.

Disclaimer

This is not an officially supported Google product.