feat(functions): Add conversions to LINES or TRIANGLES

[donmccurdy]

Converts primitives from LINE_STRIP or LINE_LOOP to LINES, or from TRIANGLE_STRIP or TRIANGLE_FAN to TRIANGLES. Examples:

import { convertPrimitiveToLines, convertPrimitiveToTriangles } from '@gltf-transform/functions';

// input: LINE_STRIP or LINE_LOOP
convertPrimitiveToLines(prim);

// input: TRIANGLE_STRIP or TRIANGLE_FAN
convertPrimitiveToTriangles(prim);

Related:

• fixes #1312

Remaining

• [x] fix implementations
• [x] passing tests
• [x] consider renaming, convertPrimitiveToTriangles / convertPrimitiveToLines
• [x] unit tests for join()
• [x] unit tests for simplify()
• [x] documentation

[donmccurdy]

• #1316 👈
• main

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