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Add OSM topography

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This commit is contained in:
Fuhrmann 2025-03-11 11:56:33 +01:00
parent c20b682d33
commit c414b9d2d6
10 changed files with 96 additions and 18 deletions
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11
app/three/utils/build-meshes.ts
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@ -6,7 +6,7 @@ import {
MeshStandardMaterial,
} from "three";
import { fetchVertices, fetchTriangleIndices } from "./utils";
import { fetchVertices, fetchTriangleIndices, transform } from "./utils";
import { TRIANGLE_INDICES_URL, VERTICES_URL } from "../config";
interface MappedFeature {
@ -38,7 +38,14 @@ async function buildMesh(layerData: MappedFeature) {
const geometry = new BufferGeometry();
const vertices = await fetchVertices(VERTICES_URL, geomId);
const positions = new BufferAttribute(vertices, 3);
// Transform coordinates to EPSG 3857
const vertices3857 = new Float32Array(vertices.length);
for (let i = 0; i < vertices.length; i += 3) {
const vertex = Array.from(vertices.slice(i, i + 3));
vertices3857.set(transform(vertex), i);
}
const positions = new BufferAttribute(vertices3857, 3);
geometry.setAttribute("position", positions);
const indexArray = await fetchTriangleIndices(TRIANGLE_INDICES_URL, geomId);