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Add terrain heights

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Fuhrmann 2025-03-13 15:11:08 +01:00
parent 3e6504d6b0
commit d2987d07c4
5 changed files with 108 additions and 98 deletions
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150
app/three/utils/build-clipping-planes.ts
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@ -470,94 +470,84 @@ function generateCapMeshes(
// Iterate over the list of geologic meshes
for (const mesh of meshes) {
// Slice visible meshes only
if (mesh.visible) {
const position = mesh.geometry.attributes.position.array;
const indices = mesh.geometry.index ? mesh.geometry.index.array : null;
const edges: Array<[Vector3, Vector3]> = [];
for (
let i = 0;
i < (indices ? indices.length : position.length / 3);
i += 3
) {
const i1 = indices ? indices[i] * 3 : i * 3;
const i2 = indices ? indices[i + 1] * 3 : (i + 1) * 3;
const i3 = indices ? indices[i + 2] * 3 : (i + 2) * 3;
const position = mesh.geometry.attributes.position.array;
const indices = mesh.geometry.index ? mesh.geometry.index.array : null;
const edges: Array<[Vector3, Vector3]> = [];
const v1 = new Vector3(
position[i1],
position[i1 + 1],
position[i1 + 2]
);
const v2 = new Vector3(
position[i2],
position[i2 + 1],
position[i2 + 2]
);
const v3 = new Vector3(
position[i3],
position[i3 + 1],
position[i3 + 2]
);
for (
let i = 0;
i < (indices ? indices.length : position.length / 3);
i += 3
) {
const i1 = indices ? indices[i] * 3 : i * 3;
const i2 = indices ? indices[i + 1] * 3 : (i + 1) * 3;
const i3 = indices ? indices[i + 2] * 3 : (i + 2) * 3;
// Check if the triangle is cut by the plane
const d1 = plane.distanceToPoint(v1);
const d2 = plane.distanceToPoint(v2);
const d3 = plane.distanceToPoint(v3);
const v1 = new Vector3(position[i1], position[i1 + 1], position[i1 + 2]);
const v2 = new Vector3(position[i2], position[i2 + 1], position[i2 + 2]);
const v3 = new Vector3(position[i3], position[i3 + 1], position[i3 + 2]);
// Compute intersection points
const intersections = [];
// Check if the triangle is cut by the plane
const d1 = plane.distanceToPoint(v1);
const d2 = plane.distanceToPoint(v2);
const d3 = plane.distanceToPoint(v3);
if (d1 * d2 < 0) intersections.push(intersectEdge(v1, v2, d1, d2));
if (d2 * d3 < 0) intersections.push(intersectEdge(v2, v3, d2, d3));
if (d3 * d1 < 0) intersections.push(intersectEdge(v3, v1, d3, d1));
// Compute intersection points
const intersections = [];
if (intersections.length === 2) {
edges.push([intersections[0], intersections[1]]);
}
if (d1 * d2 < 0) intersections.push(intersectEdge(v1, v2, d1, d2));
if (d2 * d3 < 0) intersections.push(intersectEdge(v2, v3, d2, d3));
if (d3 * d1 < 0) intersections.push(intersectEdge(v3, v1, d3, d1));
if (intersections.length === 2) {
edges.push([intersections[0], intersections[1]]);
}
// Intersection surface can be a multipolygon consisting of disconnected polygons
const polygons: Vector3[][] = buildPolygons(edges);
// Clip cap surfaces with clipping planes
const clippingPlanes = planes.filter(
(p) => !p.normal.equals(plane.normal)
);
const offset = orientation === Orientation.Z ? 1 : -1;
const material = new MeshStandardMaterial({
color: (mesh.material as MeshStandardMaterial).color,
side: DoubleSide,
polygonOffset: true,
polygonOffsetFactor: offset,
polygonOffsetUnits: offset,
clippingPlanes,
wireframe: scene.userData.wireframe,
});
const localMeshes = polygons.map((polygon) => {
const geometry = triangulatePolygon(polygon, plane);
const capMesh = new Mesh(geometry, material);
// Offset mesh to avoid flickering
const normal = plane.normal.clone().multiplyScalar(offset);
const positionAttr = capMesh.geometry.attributes.position;
for (let i = 0; i < positionAttr.count; i++) {
const x = positionAttr.getX(i) + normal.x;
const y = positionAttr.getY(i) + normal.y;
const z = positionAttr.getZ(i) + normal.z;
positionAttr.setXYZ(i, x, y, z);
}
positionAttr.needsUpdate = true;
return capMesh;
});
capMeshes.push(...localMeshes);
}
// Intersection surface can be a multipolygon consisting of disconnected polygons
const polygons: Vector3[][] = buildPolygons(edges);
// Clip cap surfaces with clipping planes
const clippingPlanes = planes.filter((p) => !p.normal.equals(plane.normal));
const offset = orientation === Orientation.Z ? 1 : -1;
const material = new MeshStandardMaterial({
color: (mesh.material as MeshStandardMaterial).color,
side: DoubleSide,
metalness: 0.0,
roughness: 0.75,
flatShading: true,
polygonOffset: true,
polygonOffsetFactor: offset,
polygonOffsetUnits: offset,
clippingPlanes,
wireframe: scene.userData.wireframe,
});
const localMeshes = polygons.map((polygon) => {
const geometry = triangulatePolygon(polygon, plane);
const capMesh = new Mesh(geometry, material);
capMesh.visible = mesh.visible;
capMesh.name = mesh.name;
// Offset mesh to avoid flickering
const normal = plane.normal.clone().multiplyScalar(offset);
const positionAttr = capMesh.geometry.attributes.position;
for (let i = 0; i < positionAttr.count; i++) {
const x = positionAttr.getX(i) + normal.x;
const y = positionAttr.getY(i) + normal.y;
const z = positionAttr.getZ(i) + normal.z;
positionAttr.setXYZ(i, x, y, z);
}
positionAttr.needsUpdate = true;
return capMesh;
});
capMeshes.push(...localMeshes);
}
return capMeshes;