Solid Angle Houdini to Arnold v2.1.1 for Houdini 16.x Win/Mac

Arnold for Houdini (or HtoA) provides a tight bridge to the Arnold renderer from within the standard Houdini interface, in a way that is familiar to both Houdini users and Arnold users in Maya or Softimage. It also enables smooth lighting workflows between Houdini and other DCC applications, since setups can be exported and shared.
Features

All Arnold cameras (perspective, orthographic, spherical, fisheye) with depth of field and advanced shutter controls.
All Arnold lights (point, distant, spot, quad, disk, cylinder, skydome, mesh) with light filters and accurate viewport representation.
Custom Arnold shading network context with a comprehensive list of 106 shaders and utilities.
Atmospheric and background effects.
Volume rendering with support for OpenVDB and particles.
Polymeshes, curves, points with support for displacement and bump mapping and subdivision.
Procedurals, with sample Alembic and mandelbulb implementations.
Accurate motion blur (transform, deform, velocity, acceleration), overridable per object.
Geometry attributes translation as user data.
Optional Arnold properties for objects and cameras.
Render to AOVs, in single or separate files.
Support all Houdini rendering contexts (render region, mplay, render viewer, render COP, batch), with support for AOVs and clickable buckets.

Interactive rendering (IPR) allows parameter changes to be rapidly previewed without interrupting your work.
Instancing.
Multi-camera renders.
DeepEXR support.

Arnold 5.0.1.1 release notes:

Bug fixes

#5981 Incorrect melanin absorption values for wide gamut rendering color spaces
#6089 Deep EXR output of light path expressions missing volumes
#6094 Artifacts in lat long skydome_light
#6095 Fresnel discontinuity in diffuse term when texture is connected to specular_color
#6097 Subdiv: duplicate vertex index in face causes crash
#6116 Warn that images will be watermarked if license authorization fails
#6124 Mesh light crashing when provided non-mesh node