UvIsland

Remarks

This is the value that makes Pack a peer of a standalone packer rather than an internal detail. docs/plan/42 § D1: an artist who cut seams by hand in another package wants those seams kept and the islands rearranged, and that is most of why a standalone packer is a product at all. An island can therefore come from this library's own charter, from the remesher's patch layout, or from a file — the packer does not ask.

⚠ Coordinates are per corner, not per position, and that is not an implementation detail. A seam is one shared position whose two sides carry different coordinates; EditMesh's corner layer represents that for nothing, and a per-vertex structure represents it by duplicating the vertex. Doing the arithmetic in the representation where a seam is free is what keeps the split at the very end, where a renderer wants it, instead of threaded through every stage.

⚠ Scale travels with the island because the packer is allowed to move it and not to resize it. docs/plan/42 § D9: non-uniform texel density is invisible in the atlas and glaring in the game — the classic symptom being a character's face at half the resolution of their boots — so a packer that quietly rescales an island to make it fit has to be able to say that it did.

Fields and properties (7)

• public IReadOnlyList<Vector2> Coordinates

  A coordinate per corner of .

• public IReadOnlyList<int> Corners

  The triangle corners this island covers, three per triangle.

• public Vector2 Minimum

  The island's lower corner, in ' space.

• public Vector2 Maximum

  Its upper corner.

• public float Scale

  Coordinates per world unit, so that texel density is a fact rather than a guess.

• public int TriangleCount

  How many triangles the island covers.

• public Vector2 Size

  How wide and how tall the island is.

Methods (1)

• public UvIsland(IReadOnlyList<Vector2> Coordinates, IReadOnlyList<int> Corners, Vector2 Minimum, Vector2 Maximum, float Scale)

  A flattened chart, in its own coordinates, waiting to be placed in an atlas.

Used by (34)

• AttemptVixen.Geometry.Uv
• FlattenFixturesVixen.Geometry.Uv.Tests
• FlattenOutcomeVixen.Geometry.Uv
• FlattenerVixen.Geometry.Uv
• IslandCorpusVixen.Geometry.Uv.Tests
• IslandMaskVixen.Geometry.Uv
• IslandShapeVixen.Geometry.Uv
• IslandSpaceVixen.Geometry.Uv.Tests
• LayoutAtlasVixen.Geometry.Remeshing
• PackedAtlasVixen.Geometry.Uv.Tests
• PackerVixen.Geometry.Uv
• RasterizerVixen.Geometry.Uv
• UvAllTestsVixen.Geometry.Uv.Tests
• UvDensityVixen.Geometry.Uv
• UvDensityTestsVixen.Geometry.Uv.Tests
• UvFlattenBijectivityTestsVixen.Geometry.Uv.Tests
• UvFlattenCotangentTestsVixen.Geometry.Uv.Tests
• UvFlattenDeterminismTestsVixen.Geometry.Uv.Tests
• UvFlattenDistortionTestsVixen.Geometry.Uv.Tests
• UvFlattenTestsVixen.Geometry.Uv.Tests
• UvLayeringTestsVixen.Geometry.Uv.Tests
• UvPackMarginTestsVixen.Geometry.Uv.Tests
• UvPackPropertyTestsVixen.Geometry.Uv.Tests
• UvPackingTestsVixen.Geometry.Uv.Tests
• UvPlacementVixen.Geometry.Uv
• UvStackingVixen.Geometry.Uv
• UvStackingTestsVixen.Geometry.Uv.Tests
• UvUdimTestsVixen.Geometry.Uv.Tests
• UvUnwrapVixen.Geometry.Uv
• UvUnwrapPipelinePropertyTestsVixen.Geometry.Uv.Tests
• BlockoutUvPanelVixen.Editor.Blockout
• GeometryRunnerVixen.Cli
• ModelGeometryVixen.Editor.Assets
• ModelGeometryIslandTestsVixen.Editor.Assets.Tests