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Add topography to mesh

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This commit is contained in:
Fuhrmann 2025-04-04 13:30:19 +02:00
parent b07af96673
commit dd65a5b804
6 changed files with 237 additions and 92 deletions
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69
app/three/utils/utils.ts
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@ -1,4 +1,4 @@
import { Vector3 } from "three";
import { PerspectiveCamera, Plane, Raycaster, Vector2, Vector3 } from "three";
import { Extent } from "./build-scene";
import { unpackEdges, unpackVertices } from "./decoders";
import proj4 from "proj4";
@ -60,12 +60,69 @@ export async function fetchVertices(pointUrl: string, geomId: string) {
return unpackVertices(buffer);
}
// Transformation from EPSG 3034 to EPSG 3857
// Transformation from EPSG 3034 to a modified EPSG 900913 using the mean radius to align with geo-three
const SOURCE = "EPSG:3034";
const PROJ_STRING =
"+proj=lcc +lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65 +x_0=4000000 +y_0=2800000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs";
const DEST = "EPSG:3857";
proj4.defs(SOURCE, PROJ_STRING);
const DEST = "EPSG:900913";
proj4.defs(
SOURCE,
"+proj=lcc +lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65 +x_0=4000000 +y_0=2800000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs"
);
proj4.defs(
DEST,
"+proj=merc +a=6371008 +b=6371008 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs +type=crs"
);
export function transform(p: number[]) {
return proj4(SOURCE, DEST, p);
}
const MAX_EXTENT = 20015111.9287618;
function getTileSize(zoom: number): number {
const numTiles = Math.pow(2, zoom);
return (2 * MAX_EXTENT) / numTiles;
}
export function tileBounds(zoom: number, x: number, y: number): number[] {
const tileSize = getTileSize(zoom);
const minX = -MAX_EXTENT + x * tileSize;
const minY = MAX_EXTENT - (y + 1) * tileSize;
return [minX, tileSize, minY, tileSize];
}
const plane = new Plane(new Vector3(0, 0, 1), 0);
const corners = [new Vector2(-1, -1), new Vector2(1, 1)];
export const getFrustumIntersections = (camera: PerspectiveCamera) => {
const points = [];
const raycaster = new Raycaster();
for (const ndc of corners) {
// Convert NDC to world space ray
raycaster.setFromCamera(ndc, camera);
// Find intersection with the XY plane
const intersection = new Vector3();
const hit = raycaster.ray.intersectPlane(plane, intersection);
if (hit) {
points.push(intersection.clone());
}
}
if (points.length > 1) {
return [
new Vector3(
Math.min(points[0].x, points[1].x),
Math.min(points[0].y, points[1].y),
0
),
new Vector3(
Math.max(points[0].x, points[1].x),
Math.max(points[0].y, points[1].y),
0
),
];
}
return points;
};