MeshResource.ShapeExtrusionOptions.ExtrusionMethod.tracePositions(_:)

Declaration

case tracePositions([SIMD3<Float>])

Discussion

The curve is defined as the set of line segments For each edge in the provided curve, the swept shape (e.g. the 2D path provided in MeshResource(extruding: Path), or text) will be instantiated at the edge’s endpoints. Each instance of the swept shape will be joined together by a strip of geometry.

The positions are traced in such a way as to avoid twist in the generated 3D shape. When possible, the local y-axis of the swept (2D) shape will be aligned with the y-axis of the generated 3D shape.

For example, extrude a rounded square along the z-axis, while zig-zagging in the y-axis:

// Positions in a zig-zag pattern.
let positions: [SIMD3<Float>] = [
    [0,    0,   0],
    [0, -0.1, 0.2],
    [0,    0, 0.4],
    [0, -0.1, 0.6]
]

var extrusionOptions = ShapeExtrusionOptions()
extrusionOptions.extrusionMethod = .tracePositions(positions)

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