Houdini Engine for Unreal - Version 2.0

Official release of version 2.0.
The plug-in is now linked to Houdini 18.5.462 / HAPI 3.5.1.

Documentation for version 2.0 of the plug-in is available:
https://www.sidefx.com/docs/unreal/


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New features:
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- Added back the Static Mesh Build Settings from v1 (tangent/normal generation, lightmap index etc.)
  Their values can be changed in the plugin's setting dialog.
- Added back the Static Mesh Generation Properties from v1.
  Their default values can be set in the plugin settings, or overridden per HDA in the Houdini Mesh Generation section.
- Added back the Houdini Engine commands from v1 (Houdini.BakeAll, Houdini.CookAll etc...)
- Added support for 4.25 on Mac OS.

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Bug fixes:
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- Fixed instantiation loop that could lock up the editor when not having access to a license, and attempting to load an HDA without the source .hda file.
- Fixed Open In Houdini / Open Session Sync not using the proper executable when using the steam version of Houdini Indie.
  We now try to use hindie.steam executable if houdini wasn't found
- Fixed button parameters being triggered upon rebuild/recook.
- Fixed button parameters being triggered on first cook after loading a level.
- Fixed properties modified by attributes on instanced actors being lost upon baking.
- Fixed possible crash with foliage instancers after load/new level
- Fixed HARS/Houdini crashing when using linear and closed editable curves in a HDA.
- Fixed primitive attributes on LODs (generic attributes, screensize) not being properly set due to invalid Prim/Vertex Index.
- Fixed the lodX_screensize/unreal_uproperty_screensize attributes being ignored.
- Restricted the classes displayed in the drop down menu when using string as asset picker without specify a class.
  Too many object types were listed, causing the drop down to be very slow to open.
  Any UObject can still be dragged and dropped on the asset picker.
- Removed unnecessary Outer checks when baking landscape.
  This should fix Landscape Baking failing when using PDG.
- Disabled the creation of attributes for material parameters of input meshes.
  This would cause crashes in HARC when a lot of of string attributes were sent.
- Ticking is now limited to 1 tick per frame.
  This reduces game-thread starvation during cook, DXGI_ERROR_DEVICE_HUNG at the end of a cook when the command list is too big.
- Optimization: Reduced unnecessary/redundant string fetch via HAPI when listing Generic Attributes, fixed slow object copy on some for loops.
- Added some Insights tag for better profiling overview.

Author: dpernuit