60 lines
1.6 KiB
TypeScript
60 lines
1.6 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { createTerrain } from "../../src/document/terrains";
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import { buildTerrainDerivedMeshData } from "../../src/geometry/terrain-mesh";
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describe("terrain mesh generation", () => {
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it("chooses the forward diagonal when the opposite-corner height delta is smaller", () => {
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const terrain = createTerrain({
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sampleCountX: 2,
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sampleCountZ: 2,
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heights: [0, 3, 1, 0]
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});
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const derivedMesh = buildTerrainDerivedMeshData(terrain);
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expect(derivedMesh.cellTriangulation).toEqual([
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{
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cellX: 0,
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cellZ: 0,
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diagonal: "forward"
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}
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]);
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expect(Array.from(derivedMesh.indices)).toEqual([0, 2, 3, 0, 3, 1]);
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});
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it("chooses the backward diagonal when that split better matches the local slope", () => {
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const terrain = createTerrain({
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sampleCountX: 2,
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sampleCountZ: 2,
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heights: [0, 0, 0, 3]
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});
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const derivedMesh = buildTerrainDerivedMeshData(terrain);
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expect(derivedMesh.cellTriangulation).toEqual([
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{
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cellX: 0,
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cellZ: 0,
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diagonal: "backward"
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}
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]);
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expect(Array.from(derivedMesh.indices)).toEqual([0, 2, 1, 1, 2, 3]);
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});
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it("derives UVs from world XZ positions instead of triangle-local stretch", () => {
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const terrain = createTerrain({
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sampleCountX: 2,
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sampleCountZ: 2,
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cellSize: 2,
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position: {
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x: 10,
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y: 4,
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z: -6
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},
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heights: [0, 1, 2, 3]
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});
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const derivedMesh = buildTerrainDerivedMeshData(terrain);
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expect(Array.from(derivedMesh.uvs)).toEqual([10, -6, 12, -6, 10, -4, 12, -4]);
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});
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});
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