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-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64

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Compiling for M1 macOS with TBB and ISPC

First you'll need to build and install TBB. Grab the source from the TBB Github and build and install it with CMake. For TBB, use the CMake command below. It's also recommended to set an install prefix to install it locally, -DCMAKE_INSTALL_PREFIX=<path to install>

$ mkdir build && cd build
$ cmake -DCMAKE_BUILD_TYPE=Release \
   -DCMAKE_CXX_OSX_DEPLOYMENT_TARGET_FLAG=-mmacosx-version-min=11 \
   -DCMAKE_C_OSX_DEPLOYMENT_TARGET_FLAG=-mmacosx-version-min=11 \
   -DTBB_STRICT=OFF \
   -DTBB_TEST=OFF \
   ..
$ make install

For ISPC support you'll need to build ISPC, either from the fork https://github.com/Twinklebear/ispc enabling the macOS + arm/neon target, or from the main repo if the pull request https://github.com/ispc/ispc/pull/1943 has been merged. ISPC should be built using their provided build script by running scripts/build.sh from the root directory of the ISPC repo. On M1 you can pass -j 8 to use all 8 cores when building ISPC. The ISPC compiler will be installed under <ispc repo>/install/bin/, which you'll want to add to your path.

Finally, you can build Embree. If you're building with ISPC support, you'll also pass -DEMBREE_ISPC_SUPPORT=ON, If you have GLFW installed you can also set -DEMBREE_TUTORIALS_GLFW=ON to build the interactive tutorials. It's also recommended to set an install prefix to install embree locally, -DCMAKE_INSTALL_PREFIX=<path to install>

$ mkdir build && cd build
$ cmake \
   -DCMAKE_BUILD_TYPE=Release \
   -DEMBREE_ARM=ON \
   -DEMBREE_IOS=ON \
   -DEMBREE_TASKING_SYSTEM=TBB \
   -DEMBREE_TUTORIALS=ON \
   -DEMBREE_RAY_PACKETS=ON \
   -DEMBREE_MAX_ISA=AVX2 \
   -DEMBREE_NEON_AVX2_EMULATION=ON \
   -DAS_MAC=ON \
   -DCMAKE_OSX_ARCHITECTURES=arm64 \
   -DCMAKE_OSX_DEPLOYMENT_TARGET=11 \
   -DTBB_DIR=<tbb install dir>/lib/cmake/TBB/ \
   -DEMBREE_ISPC_SUPPORT=ON \
   ..
$ make install

To avoid warnings about failing to set thread affinity with TBB, run the tutorials with --set_affinity 0, and when creating the embree device in your code, pass set_affinity=0 to rtcNewDevice:

RTCDevice device = rtcNewDevice("set_affinity=0");

Build monolithc embree with TBB(experimental)

EMBREE_USE_EMBEDDED_TBB=On builds the embree with local tbb. (Dowload TBB and extract it to thrid_party/tbb. Adding TBB as a submodule was removed as original Intel Embree did)

This will enable building monolithic embree library with single cmake build procedure. (Would make embree build with TBB support for emerging architecures and cross compiling easier)

  -DEMBREE_TASKING_SYSTEM=Internal \
  -DEMBREE_USE_EMBEDDED_TBB=On \