ANARI-SDK

This repository contains the source for the ANARI API SDK. This includes:

• Front-end library + implementation guide
• Device implementation utilties for implementations
• Example device implementation (not intended for production use)
• Example applications
• Interactive sample viewer
• Render tests
• (experimental) OpenUSD Hydra render delegate plugin

The 1.0 ANARI specification can be found on the Khronos website here.

The SDK is tested on Linux, but is also intended to be usable on other operating systems such as macOS and Windows.

If you find any problems with the SDK, please do not hesitate to open an issue on this project!

Getting the SDK from vcpkg

The ANARI-SDK is available as the anari package in vcpkg. Simply follow these instructions for setting up your environment to use vcpkg, then run the following to get ANARI:

% vcpkg install anari

Building the SDK from source

The repository uses CMake 3.11+ to build the library, example implementation, sample apps, and tests. For example, to build (must be in a separate directory from the source directory), you can do:

% cd /path/to/anari
% mkdir build
% cd build
% cmake ..

Using a tool like ccmake or cmake-gui will let you see which options are available to enable. The following CMake options are offered:

• BUILD_SHARED_LIBS : build everything as shared libraries or static libraries
• BUILD_CTS : build the conformance test suite
• BUILD_TESTING : build unit and regression test binaries
• BUILD_HELIDE_DEVICE : build the provided example helide device implementation
• BUILD_REMOTE_DEVICE : build the provided experimental remote device implementation
• BUILD_EXAMPLES : build example applications
• BUILD_VIEWER : build viewer too (needs glfw3) if building examples
• BUILD_HDANARI : build (experimental) OpenUSD Hydra delegate plugin

Once built, the library can be installed via the install target created by CMake. This can be invoked from your build directory with (on any platform):

% cmake --build . -t install

Using the SDK after install with CMake

The ANARI SDK exports CMake targets for the main front-end library and utilities helper library. The targets which are exported are as follows:

• anari::anari : main library target to link with libanari
• anari::helium : (static) library target containing base device implementation abstractions

These targets can be found with CMake via find_package(anari). The examples are written such that they can be built stand alone from the SDK source tree. The simplest usage can be found here.

The follwoing additional helper library components can be requested by listing them under find_pacakge(anari):

• viewer : Source library target anari::anari_viewer for building small viewer apps
• code_gen : Enable the use of code generation CMake functions downstream

Both of these libraries are both optionally installed and are not available to downstream projects unless they are explicitly requested. To request one of these components, simply add them to the COMPONENTS portion of find_package:

find_package(anari COMPONENTS viewer code_gen)

Running the examples

The basic tutorial app (built by default) uses the helide device as an example, which can be run with:

% ./anariTutorial

Note that running the tutorial will require that the helide device is enabled in your build with the CMake option BUILD_HELIDE_DEVICE=ON.

The viewer application (enabled with BUILD_VIEWER=ON) by default uses the environment library, which reads ANARI_LIBRARY as an environment variable to get the library to load. For example it can be run with:

% export ANARI_LIBRARY=helide
% ./anariViewer

Alternatively, either --library or -l can be used on the viewer's command line to override the ANARI library to be loaded.

The regression test binary (anariRenderTests) used to render the test scenes without a window (results saved out as PNG images) uses the same mechanisms as the viewer to select/override which library is loaded at runtime.

Available Implementations

SDK provided example implementation

An example device implementation helide is provided as a starting point for users exploring the SDK and for implementors to see how the API might be implemented. It implements a very simple, geometry-only ray tracing implementation using Embree for intersection. Users should look to use vendor provided, hardware-optimized ANARI implementations which are shipped independently from the SDK. (see below)

Using the debug device layer

The ANARI-SDK ships with a debug layer implemented as an ordinary ANARIDevice which wraps a device (set as the wrappedDevice parameter on the debug device). This device uses the object queries reported by the wrapped device to validate correct usage of object subtypes, parameters, and properties, as well as validate correct object lifetimes. The wrapped device is then used to actually implement the ANARI API to allow applications to still function normally.

The device can be created by using the normal library loading mechanics using anariLoadLibrary("debug", ...), creating a the debug device instances with, anariNewDevice(debugLibrary, "default"), and then creating a device to use and set it on the device with anariSetParameter(debugDevice, "wrappedDevice", ANARI_DEVICE, &wrappedHandle).

As a convenience, users can use the ANARI_DEBUG_WRAPPED_LIBRARY environment variable to have the debug device do the mechanics of loading and creating the underlying wrapped library. For example, you can do the following to run the viewer with the debug device wrapping helide:

% ANARI_LIBRARY=debug ANARI_DEBUG_WRAPPED_LIBRARY=helide ./anariViewer

Or using the -l syntax for specifying the library:

% ANARI_DEBUG_WRAPPED_LIBRARY=helide ./anariViewer -l debug

See the simple debug device turorial for how to setup the debug device without using environment variables.

Note that if ANARI_DEBUG_WRAPPED_LIBRARY is set, it will take priority over programatically set wrapped devices.

Tracing features of the debug device can be set using the following environment variables:

• ANARI_DEBUG_TRACE_MODE sets the tracing mode, only code is supported for now.
• ANARI_DEBUG_TRACE_DIR set the folder where the trace will be dumped.

Unofficial list of publically available implementaions

Below is a list of available ANARI implemenations compatible with this SDK:

• AMD RadeonProRender
• Barney (experimental MPI distributed renderer)
• Intel OSPRay
• NVIDIA USD
• NVIDIA VisRTX + VisGL
• Visionaray

If you implement a backend to the ANARI SDK, please open a PR to add it to this list!