Embree v3.13.1 Release

• Added support for ISPC+ARM.
• Releases upgrade to TBB 2021.3.0 and ISPC 1.16.1

Embree v3.13.0 Release

• Added support for Apple M1 CPUs.
• RTC_SUBDIVISION_MODE_NO_BOUNDARY now works properly for non-manifold edges.
• CMake target 'uninstall' is not defined if it already exists.
• Embree no longer reads the .embree3 config files, thus all configuration has to get passed through the config string to rtcNewDevice.
• Releases upgrade to TBB 2021.2.0 and ISPC 1.15.0
• TBB dll is automatically copied into build folder after build on windows.

Embree v3.12.2 Release

• Fixed wrong uv and Ng for grid intersector in robust mode for AVX.
• Removed optimizations for Knights Landing.
• Upgrading release builds to use oneTBB 2021.1.1

Embree v3.12.1 Release

• Changed default frequency level to SIMD128 for Skylake, Cannon Lake, Comet Lake and Tiger Lake CPUs.
  This change typically improves performance for renderers that just use SSE by maintaining higher
  CPU frequencies. In case your renderer is AVX optimized you can get higher ray tracing performance
  by configuring the frequency level to simd256 through passing frequency_level=simd256 to rtcNewDevice.

Embree v3.12.0 Release

• Added linear cone curve geometry support. In this mode a real geometric surface for curves
  with linear basis is rendered using capped cones. They are discontinuous at edge boundaries.
• Enabled fast two level builder for instances when low quality build is requested.
• Bugfix for BVH build when geometries got disabled.
• Added EMBREE_BACKFACE_CULLING_CURVES cmake option. This allows for a cheaper round
  linear curve intersection when correct internal tracking and back hits are not required.
  The new cmake option defaults to OFF.
• User geometries with invalid bounds with lower>upper in some dimension will be ignored.
• Increased robustness for grid interpolation code and fixed returned out of range u/v
  coordinates for grid primitive.
• Fixed handling of motion blur time range for sphere, discs, and oriented disc geometries.
• Fixed missing model data in releases.
• Ensure compatibility to newer versions of oneTBB.
• Motion blur BVH nodes no longer store NaN values.

Embree v3.11.0 Release

• Round linear curves now automatically check for the existence of left and right
  connected segments if the flags buffer is empty. Left segments exist if the
  segment(id-1) + 1 == segment(id) and similarly for right segments.
• Implemented the min-width feature for curves and points, which allows to increase the
  radius in a distance dependent way, such that the curve or points thickness is n pixels wide.
• Round linear curves are closed now also at their start.
• Embree no longer supports Visual Studio 2013 starting with this release.
• Bugfix in subdivision tessellation level assignment for non-quad base primitives
• Small meshes are directly added to top level build phase of two-level builder to reduce memory consumption.
• Enabled fast two level builder for user geometries when low quality build is requested.

Embree v3.10.0 Release

• Added EMBREE_COMPACT_POLYS CMake option which enables double indexed triangle and quad
  leaves to reduce memory consumption in compact mode by an additional 40% at about
  15% performance impact. This new mode is disabled by default.
• Compile fix for oneTBB 2021.1-beta05
• Releases upgrade to TBB 2020.2
• Compile fix for ISPC v1.13.0
• Adding RPATH to libembree.so in releases
• Increased required CMake version to 3.1.0
• Made instID member for array of pointers ray stream layout optional again.

Embree v3.9.0

• Added round linear curve geometry support. In this mode a real geometric surface for curves
  with linear basis is rendered using capped cones with spherical filling between
  the curve segments.
• Added rtcGetSceneDevice API function, that returns the device a scene got created in.
• Improved performance of round curve rendering by up to 1.8x.
• Bugfix to sphere intersection filter invokation for back hit.
• Fixed wrong assertion that triggered for invalid curves which anyway get filtered out.
• RelWithDebInfo mode no longer enables assertions.
• Fixed an issue in FindTBB.cmake that caused compile error with Debug build under Linux.
• Embree releases no longer provide RPMs for Linux. Please use the RPMs coming with the package
  manager of your Linux distribution.

Embree v3.8.0 Release

New Features:

• Added collision detection support for user geometries (see rtcCollide API function)
• Passing geomID to user geometry callbacks.

Fixed Issues:

• Bugfix in AVX512VL codepath for rtcIntersect1
• For sphere geometries the intersection filter gets now invoked for
  front and back hit.
• Fixed some bugs for quaternion motion blur.
• RTCIntersectContext always non-const in Embree API
• Made RTCHit aligned to 16 bytes in Embree API

Embree v3.7.0 Release

• Added quaternion motion blur for correct interpolation of rotational transformations.
• Fixed wrong bounding calculations when a motion blurred instance di
  instantiate a motion blurred scene.
• In robust mode the depth test consistently uses tnear <= t <= tfar now in order
  to robustly continue traversal at a previous hit point
  in a way that guarentees reaching all hits, even hits at the same place.
• Fixed depth test in robust mode to be precise at tnear and tfar.
• Added next_hit tutorial to demonstrate robustly collecting all hits
  along a ray using multiple ray queries.
• Implemented robust mode for curves. This has a small performance impact but
  fixes bounding problems with flat curves.
• Implemented issue with motion blur builder where number of time segments
  for SAH heuristic were counted wrong due to some numerical issues.
• Fixed an accuracy issue with rendering very short fat curves.
• rtcCommitScene can now get called during rendering from multiple threads
  to lazily build geometry. When TBB is used this causes a much lower overhead
  than using rtcJoinCommitScene.
• Geometries can now get attached to multiple scenes at the same time, which
  simplifies mapping general scene graphs to API.
• Updated to TBB 2019.9 for release builds.
• Fixed a bug in the BVH builder for Grid geometries.
• Added macOS Catalina support to Embree releases.