Module world_topology 

Shared topology helpers for cooked world quads and wall shapes.

Constants

HORIZONTAL_NE_SW_TRIANGLES

Triangle indices for a horizontal NE-SW split.

HORIZONTAL_NW_SE_TRIANGLES

Triangle indices for a horizontal NW-SE split.

SPLIT_ONE_THREE_TRIANGLES

Triangles for a split from corner 1 to corner 3.

SPLIT_ZERO_TWO_TRIANGLES

Triangles for a split from corner 0 to corner 2.

WHOLE_QUAD_TRIANGLE_INDEX

Triangle index used by runtime caches for unsplit whole quads.

Functions

horizontal_triangle_at_local

Runtime horizontal triangle for a local X/Z point. Coordinates use the .psxw convention: local Z=0 is the north edge.

split_triangle

Resolve one triangle for split_id. Indices other than zero select the second triangle.

split_triangles

Resolve a split id to the two triangle corner sets. Unknown split ids fall back to NW-SE so malformed data still draws a coherent full surface.

triangle_contains_corner

Return true when triangle contains corner.

wall_shape_for_dropped_corner

Shape id for removing one wall corner.

wall_shape_triangle

Surviving triangle for a dropped-corner wall shape. The returned split id uses the generic quad-corner numbering: [bottom-left, bottom-right, top-right, top-left].

wall_shape_triangle_corners

Wall-corner members for the triangle surviving shape.

Type Aliases

SplitTriangles

The two triangles that compose a quad.

TriangleCorners

Three corner indices making up one triangle.