Cartographic Polygon and Polygon Imagery layer default values

[r-veenstra]

I suggest we implement the following default values to make using cartographic polygons and polygon overlays a little easier

Imagery Overlay

• Overlay Render Method - clipping - same as Unreal, also less confusing as it won't immediately make the tileset black

Cartographic Polygons - defaults when creating by any method

• point3f[] points = [(-1000, 0, -1000), (-1000, 0, 1000), (1000, 0, 1000), (1000, 0, -1000)] - Helpful to have some pre-existing points for the user to grab and edit, vs trying to draw from scratch. Unreal does this. (especially as raycasting to tilesets is not currently available)
• uniform token type = "linear" - Helpful to avoid accidental use of curves which aren't supported
• uniform token wrap = "periodic" - Ensures the polygon is closed

cc @corybarr

[corybarr]

Setting point3f[] points = [(-1000, 0, -1000), (-1000, 0, 1000), (1000, 0, 1000), (1000, 0, -1000)] in the USD schema leads to a crash in Omniverse when a CesiumCartographicPolygonPrim is created. I'm seeing if this is solvable, but it might have to be done at the Python level during prim creation.

[lilleyse]

@corybarr does that crash happen in #626?

[corybarr]

• point3f[] points = [(-1000, 0, -1000), (-1000, 0, 1000), (1000, 0, 1000), (1000, 0, -1000)] - Helpful to have some pre-existing points for the user to grab and edit, vs trying to draw from scratch. Unreal does this. (especially as raycasting to tilesets is not currently available)

  Create an issue with the title `point3f[] points = [(-1000, 0, -1000), (-1000, 0, 1000), (1000, 0, 1000), (1000, 0, -1000)]` - Helpful to have some pre-existing points for the user to grab and edit, vs trying to draw from scratch.  Unreal does this. (especially as raycasting to tilesets is not currently available). Press Enter to convert to an issue instantly. Press Alt-Enter to open the create new issue form in the current tab. Press Shift-Enter to open the create new issue form.
  

• uniform token type = "linear" - Helpful to avoid accidental use of curves which aren't supported

  Create an issue with the title `uniform token type = "linear"` - Helpful to avoid accidental use of curves which aren't supported. Press Enter to convert to an issue instantly. Press Alt-Enter to open the create new issue form in the current tab. Press Shift-Enter to open the create new issue form.
  

• uniform token wrap = "periodic" - Ensures the polygon is closed

@lilleyse It does happen in #626. The crash's trace doesn't go through our code.

[corybarr]

Setting point3f[] points = [(-1000, 0, -1000), (-1000, 0, 1000), (1000, 0, 1000), (1000, 0, -1000)] in the USD schema leads to a crash in Omniverse when a CesiumCartographicPolygonPrim is created. I'm seeing if this is solvable, but it might have to be done at the Python level during prim creation.

Since some attributes require setting other attributes, I tried adding curveVertexCounts and extent. I still got the crash. Given that, I copied all attributes from a working CesiumCartographicPolygonPrim but still get the instantiation-time crash.