Create a converter to convert Blocks as Instance Static Meshes

[JR-Morgan]

Motivation

Instanced Static Meshes can be rendered much more efficiently, especially with many instances in a scene.

Current Behaviour

Block instances are converted as empty actors (with a transform) here, with their geometry converted as regular UStaticMeshComponent, here .

Since we don't currently define a UBlockDefinition object model in C++, block definition are implicitly converted through normal object traversal.

Desired Behaviour

Geometry inside a Block Definition should get converted as UInstancedStaticMeshComponent/UHierarchicalInstancedStaticMeshComponent.

Potential Solution

This can be done either with:

1. A new converter (ideally in C++, but BP would be acceptable)
2. Changes to UStaticMeshConverter and, potentially UBlockConverter

Ideally all changes should be contained within Converters and Objects models.

Useful Resources

• Speckle Unreal - Developing Custom Object Conversions
• Speckle-Sharp - Block object models

[JR-Morgan]

Closing for now until users request this feature