ryan schmidt 48e1cabf77 Added support for world-space hit-testing and snapping to Volume and DynamicMeshComponent mesh vertices/edges/faces, by having Modeling Mode maintain a persistent set of spatial data structures for these scene meshes. With this change, new ToolSceneQueriesUtil functions can be used to provide more general scene mesh-element hit-testing/snapping via ModelingSceneSnappingManager. Updates to existing Tools/Mechanics to use these new query functions will be done in later CLs. ...

ToolsFramework:
- added new USceneSnappingManager::ExecuteSceneHitQuery API function, as well as accompanying FSceneHitQueryRequest/FSceneHitQueryResult structs
- added FSceneQueryVisibilityFilter struct which contains ComponentsToIgnore/InvisibleComponentsToInclude lists for snapping queries and provides shared IsVisible() implementation

ModelingComponents:
- add FLevelObjectsObserver, tracks Actors added/removed to a Level via various editor events
- add FSceneGeometrySpatialCache, maintains spatial data structures for known types of mesh-backed PrimitiveComponents, an octree based on their world-space bounding-boxes, and provides various spatial-query functions
- ModelingSceneSnappingManager now maintains a FSceneGeometrySpatialCache for a set of Actors/Components it is notified about, and updates the spatial cache if those components are modified or translated. Currently supports Volumes and DynamicMeshComponents.
- add ModelingSceneSnappingManager::ExecuteSceneHitQuery implementation, does raycasts into the world (for static mesh components) and FSceneGeometrySpatialCache for Volumes/DMCs
- modified ModelingSceneSnappingManager::ExecuteSceneSnapQuery to also do combined query against StaticMeshComponents via world-linetrace, and FSceneGeometrySpatialCache for Volumes/DMCs
- add ToolSceneQueriesUtil::FindNearestVisibleObjectHit variants that take a USceneSnappingManager or UInteractiveTool, and do queries via the SceneSnappingManger, instead of directly linetracing into a UWorld

ModleingToolsEditorMode:
- add FLevelObjectsObserver instance and use it to drive updates to active ModelingSceneSnappingManager

#rnx
#jira none
#preflight 61a664a09a226d9e823ad4c1

#ROBOMERGE-AUTHOR: ryan.schmidt
#ROBOMERGE-SOURCE: CL 18339853 in //UE5/Release-5.0/... via CL 18339869
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v895-18170469)

[CL 18339891 by ryan schmidt in ue5-release-engine-test branch]

2021-12-01 11:15:01 -05:00

..

SceneSnappingManager.cpp

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