Creating a triangle will also create a 'shadow' polygon for backward compatibility, although this is omitted when serializing.
As with polygons, any missing edges are created when creating a new triangle, and operations such as adjacency are available to triangles, just as for polygons.
The native serialization format for MeshDescription is now based around triangles.
Polygons of arbitrary number of edges may still be represented, and when created, will automatically generate the appropriate number of triangles. Polygons of more than three sides automatically generate 'internal edges', which are owned by the polygon, and which will be regenerated if the polygon is retriangulated. Internal edges are otherwise not distinct from other edges, and can be used to determine connected triangles or vertices.
Direct access to public members of mesh element classes (FMeshVertex, etc) is now deprecated. In particular, vertex instances and edges now hold a list of connected triangles, and the ConnectedPolygons member is deprecated and will be removed (as this data can be derived from the ConnectedTriangles list).
Improved the MeshDescription API, providing more operations, and allowing arrays with different allocators to be provided as results containers.
Fixed several MeshEditing operations.
Added MeshDescription unit tests.
#rb none
[CL 7099758 by Richard TalbotWatkin in Dev-Editor branch]
Add a generic opaque mesh view interface FLayoutUV::IMeshView to abstract mesh data access and allow FLayoutUV to be used with any mesh type in any module.
Replaced few instances of using an old version of overlapping corners data structure (multi-map) with new specialized FOverlappingCorners container.
#rb Alexis.Matte
#rb Brian.Karis
[CL 4242975 by Yuriy ODonnell in Dev-Editor branch]
Fixed some flaws in the original API, deprecated various methods, and introduced some new features.
- Now attribute arrays are accessed via TAttributesRef or TAttributesView (and corresponding const versions). These value types hold references to attribute arrays, and individual elements can be accessed by their element ID and attribute index. Using a value type is safer than the previous method which required assignment to a const-ref (and not doing so would take a temporary copy of the attribute array).
- The attribute set has been totally flattened, so all attributes of different types are added to the same container. This greatly improves compile times, prevents attributes from being created with the same name but different types, and permits the view feature.
- The class hierarchy has changed to have generic base classes where possible with no particular ElementID type. This reduces the code footprint by no longer generating nearly identical copies of templated methods.
- A TAttributesView allows the user to access an attribute array by the type of their choosing, regardless of its actual type. For example, the Normal attribute may be registered with type FPackedVector, but accessed as if it was an FVector. This allows us to move away from very strong typing, and instead transparently store attributes of a more efficient size, while the user is not affected.
- A transient attribute flag has been added, to denote that a particular attribute should not be saved.
#rb none
[CL 4226081 by Richard TalbotWatkin in Dev-Editor branch]
- Refactor to put UStaticMesh Mesh Descriptions in a separate object which is not loaded by default, but which can be requested when needed. This needs to be kept in sync with the number of SourceModel LODs.
- Various refactors to import/building.
- Changed UMeshDescription to FMeshDescription, and made its preferred semantics pass-by-reference rather than by pointer.
- Deprecated UMeshDescription.
#rb Alexis.Matte
#jira
#ROBOMERGE-SOURCE: CL 4135475 in //UE4/Release-4.20/...
#ROBOMERGE-BOT: RELEASE (Release-4.20 -> Release-Staging-4.20)
#ROBOMERGE-AUTHOR: richard.talbotwatkin
[CL 4135477 by richard talbotwatkin in Staging-4.20 branch]
- Refactor to put UStaticMesh Mesh Descriptions in a separate object which is not loaded by default, but which can be requested when needed. This needs to be kept in sync with the number of SourceModel LODs.
- Various refactors to import/building.
- Changed UMeshDescription to FMeshDescription, and made its preferred semantics pass-by-reference rather than by pointer.
- Deprecated UMeshDescription.
#rb Alexis.Matte
#jira
#ROBOMERGE-SOURCE: CL 4135306 in //UE4/Release-4.20/...
#ROBOMERGE-BOT: RELEASE (Release-4.20 -> Release-Staging-4.20)
#ROBOMERGE-AUTHOR: richard.talbotwatkin
[CL 4135311 by richard talbotwatkin in Staging-4.20 branch]
