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Houdini 15.5.553
Fixed a bug in the Alembic ROP that prevented it from promoting some attributes when the "Primitive to Detail" toggle was enabled.
yesterday
Houdini 15.5.549
Added support for independent offset limits for distinct fillet boundary loops. The new toggle "Use Common Limit" will be off by default on Houdini 15.5.547 and later but will be set to on for nodes created on prior versions for compatibility. When off, each boundary loop stops at its own limit.

Fixed some highlighting issues.

Mon. July 25, 2016
Houdini 15.5.547
Unity: Fixed a bug that showed our Houdini curve guides in playmode if the scene file was loaded via code.
Sat. July 23, 2016
Houdini 15.5.546
Fixed an issue in the Agent Configure Joints SOP that could cause the auto-computed joint limits to be incorrectly oriented.
Fri. July 22, 2016
Houdini 15.5.545
Fixed a bug in the Alembic SOP that caused Houdini to incorrectly identify shape nodes with animated face sets as not animated in some situations.
Thu. July 21, 2016
Houdini 15.5.545
Fix problems with opinput() hscript expression dependencies not being properly updated when used on subnets.
Thu. July 21, 2016
Houdini 15.5.545
Added support for point bevelling in PolyBevel. There is now a "Group Type" parameter which determines whetehr the bevelling is affecting points or edges (possibly edges of primitives if the group type is set to primitive).

Point bevelling also extends to points of isolated (open) polygon curves.

In primitive bevelling, a new toggle is added to allow skipping bevelling of edges shared by two selected polygons.

Thu. July 21, 2016
Houdini 15.5.545
On Windows, the Houdini logo icon now contains 48x48 and 96x96 images so that it doesn't show up blurry under certain image sizes in the File Explorer or Desktop.
Thu. July 21, 2016
Houdini 15.5.545
Fixed a bug when importing string values from packed primitives using the renderstate() function.
Thu. July 21, 2016
Houdini 15.5.545
Fixed an OpenEXR reader crash.
Thu. July 21, 2016
Houdini 15.5.545
Promotion from a detail attribute to a primitive, point, or vertex attribute is now much faster. This was the bottleneck for many cases of unpacking packed primitives whose internal geometry had detail attributes. Some other cases of attribute promotion are also a little faster, and promotion from a vertex or primitive attribute to a point attribute with the first match or last match method should now no longer change behaviour if the input geometry is saved to a file and then loaded from that file.
Thu. July 21, 2016
Houdini 15.5.545
Promotion from a detail attribute to a primitive, point, or vertex attribute is now much faster. This was the bottleneck for many cases of unpacking packed primitives whose internal geometry had detail attributes. Some other cases of attribute promotion are also a little faster, and promotion from a vertex or primitive attribute to a point attribute with the first match or last match method should now no longer change behaviour if the input geometry is saved to a file and then loaded from that file.
Thu. July 21, 2016
Houdini 15.5.544
Fixed issue where Indie session couldn't open Apprentice scene files.
Wed. July 20, 2016
Houdini 15.5.544
Fixed a viewport leak of GL buffers most noticeable in DOPs.
Wed. July 20, 2016
Houdini 15.5.544
The Hair Shader's specular intensity isn't multiplied by 'Cd' attributes anymore.
Wed. July 20, 2016
Houdini 15.5.544
The Hair Shader's specular intensity isn't multiplied by 'Cd' attributes anymore.
Wed. July 20, 2016
Houdini 15.5.544
Fixed handling of polysoup primitives when generating RIB files.
Wed. July 20, 2016
Houdini 15.5.543
Fixed a deformation motion blur bug with a certain class of of custom packed primitive when the primitives were locally transformed.
Tue. July 19, 2016
Houdini 15.5.542
The parameters for pixar lights have been updated to reflect changes required for RIS 21.
Mon. July 18, 2016
Houdini 15.5.542
The Bullet solver will now wake up objects that receive feedback impacts.
Mon. July 18, 2016
Houdini 15.5.542
Improved startup time of gplay when specifying a sequence of large geometry files on the command line.
Mon. July 18, 2016
Houdini 15.5.542
The Pixar disk, portal, rectangle and sphere lights now have scale parameters.
Mon. July 18, 2016
Houdini 15.5.539
Resolved issue when baking tangent normal maps between low/high resolution objects. Previously we were computing the UV tangent basis using the current geometry, which was incorrect.

Added a VEX function to support this method, getuvtangents(), allowing sampling of UV tangents on arbitrary objects.

Fri. July 15, 2016
Houdini 15.5.539
OP_Operator::getOpTabSubMenuPath() virual override will work for any operator. Previously some HDK ops added after DSO load would not respect that virtual.
Fri. July 15, 2016
Houdini 15.5.539
Fixed Houdini for recent Windows Insider Preview builds.
Fri. July 15, 2016