1.7.2.0

Features

VisibilityQuery : Added a node for querying the visibility of a particular scene location.
PrimitiveVariableType : Added a node for changing the type and interpretation of primitive variables (#7111).

Cycles : Fixed rendering of shaders written with IECOREUSD_WRITE_CONFORMANT_OSL_SHADERS=1.
MergeMeshes, MergeCurves, MergePoints : Fixed crash when merge is sorted by a primitive variable and none of the locations to merge contain primitives.
NodeEditor : Fixed flicker when changing the node being viewed.
Linux : Fixed startup from installation directory containing spaces.
SceneReader : Fixed loading of float-precision orientations from the USD PointInstancer.orientationsf attribute. Previously only the half-precision orientations attribute was supported.
Viewer : Fixed colourspace handling for PNG files loaded as textures for custom OpenGL shaders.
PointInstancer : Fixed potential interactive render update bug.
RenderPassEditor, DeleteRenderPasses : Fixed bugs which made it appear that the renderPass:names option was allowed to be dependent on the ${renderPass} context variable.