Add grid; clipping plane

app/three/utils/build-clipping-plane.ts

@@ -0,0 +1,69 @@
+import {
+  DoubleSide,
+  Mesh,
+  MeshBasicMaterial,
+  PerspectiveCamera,
+  Plane,
+  PlaneGeometry,
+  Vector3,
+  WebGLRenderer,
+} from "three";
+import { DragControls, OrbitControls } from "three/examples/jsm/Addons.js";
+import { Extent } from "./build-scene";
+import { getCenter3D } from "./utils";
+
+export function createClippingPlane(
+  renderer: WebGLRenderer,
+  camera: PerspectiveCamera,
+  orbitControls: OrbitControls,
+  extent: Extent
+) {
+  const center = getCenter3D(extent);
+
+  const width = extent.xmax - extent.xmin;
+  const height = extent.ymax - extent.ymin;
+  const d = extent.zmax;
+
+  // Visual representation of the clipping Plane
+  // Plane is given in Hesse normal form
+  const normalVector = new Vector3(0, 0, -1);
+  const plane = new Plane(normalVector, d);
+
+  // Dragging Mechanism
+  const planeMesh = new Mesh(
+    new PlaneGeometry(width, height),
+    new MeshBasicMaterial({
+      visible: true,
+      color: 0xff0000,
+      transparent: true,
+      opacity: 0.1,
+      side: DoubleSide,
+    })
+  );
+  planeMesh.position.set(center.x, center.y, d);
+
+  const dragControls = new DragControls(
+    [planeMesh],
+    camera,
+    renderer.domElement
+  );
+
+  // Disable OrbitControls when dragging starts
+  dragControls.addEventListener("dragstart", () => {
+    orbitControls.enabled = false;
+  });
+
+  // Re-enable OrbitControls when dragging ends
+  dragControls.addEventListener("dragend", () => {
+    orbitControls.enabled = true;
+  });
+
+  dragControls.addEventListener("drag", (event) => {
+    const newZ = event.object.position.z;
+    plane.constant = newZ;
+    planeMesh.position.x = center.x;
+    planeMesh.position.y = center.y;
+  });
+
+  return { planeMesh, plane };
+}

app/three/utils/build-grid.ts

@@ -0,0 +1,91 @@
+import {
+  CanvasTexture,
+  GridHelper,
+  Sprite,
+  SpriteMaterial,
+  Vector3,
+  Vector4,
+} from "three";
+import { Extent } from "./build-scene";
+import { getCenter3D } from "./utils";
+
+export function buildGrid(extent: Extent) {
+  const center = getCenter3D(extent);
+  // Calculate the width and height of the grid
+  const gridWidth = extent.xmax - extent.xmin;
+  const gridHeight = extent.ymax - extent.ymin;
+
+  // Decide on the number of divisions (e.g., 20 divisions along each axis)
+  const divisions = 20;
+
+  // Create a grid helper with the calculated grid size and divisions
+  const gridHelper = new GridHelper(Math.max(gridWidth, gridHeight), divisions);
+
+  // Position the grid in the scene to match the given extent
+  gridHelper.position.set(center.x, center.y, 0); // Center the grid at the midpoint
+
+  // Rotate the grid if needed to align with the world coordinates
+  gridHelper.rotation.x = Math.PI / 2; // Rotate to align with the XY plane
+
+  // Retrieve the geometry of the grid helper
+  const geometry = gridHelper.geometry;
+
+  const positionAttr = geometry.getAttribute("position");
+  const startingPointsHorizontal = [];
+  const startingPointsVertical = [];
+  for (let i = 0; i < positionAttr.count; i++) {
+    const x = positionAttr.getX(i);
+    const z = positionAttr.getZ(i);
+    const v = new Vector4(x + center.x, z + center.y, 0, 1);
+
+    if (i % 4 === 0 && i > 4) {
+      startingPointsVertical.push(v);
+    } else if (i % 2 == 0) {
+      startingPointsHorizontal.push(v);
+    }
+  }
+
+  const annotations = [];
+  for (let point of startingPointsHorizontal) {
+    const label = createLabel(`${point.x.toFixed(2)}`, point);
+    annotations.push(label);
+  }
+
+  for (let point of startingPointsVertical) {
+    const label = createLabel(`${point.y.toFixed(2)}`, point);
+    annotations.push(label);
+  }
+
+  return { gridHelper, annotations };
+}
+
+// Function to create annotation (sprite with text)
+function createLabel(text: string, position: Vector4) {
+  const spriteMaterial = new SpriteMaterial({
+    map: new CanvasTexture(generateTextCanvas(text)), // Create text texture
+    transparent: true,
+  });
+  const sprite = new Sprite(spriteMaterial);
+  sprite.position.set(position.x, position.y, position.z);
+  sprite.scale.set(10000, 5000, 1); // Scale the sprite to make the text readable
+  return sprite;
+}
+
+// Function to generate a text canvas for the annotation
+function generateTextCanvas(text: string) {
+  const canvas = document.createElement("canvas");
+  const context = canvas.getContext("2d");
+
+  if (context) {
+    // Set a background color for the canvas to make it visible
+    canvas.width = 800; // Set a fixed width for the canvas
+    canvas.height = 160; // Set a fixed height for the canvas
+
+    // Set the text style
+    context.font = "45px Arial";
+    context.fillStyle = "black"; // Text color
+    context.fillText(text, 400, 80); // Draw the text on the canvas
+  }
+
+  return canvas;
+}

app/three/utils/build-meshes.ts

@@ -6,6 +6,10 @@ import {
   Group,
   Mesh,
   MeshStandardMaterial,
+  Plane,
+  PlaneHelper,
+  Scene,
+  Vector3,
 } from "three";
 
 import { uniforms } from "./uniforms";
@@ -22,7 +26,7 @@ interface MappedFeature {
   preview: { legend_color: string; legend_text: string };
 }
 
-async function buildMesh(layerData: MappedFeature) {
+async function buildMesh(layerData: MappedFeature, clippingPlanes: Plane[]) {
   const color = `#${layerData.preview.legend_color}`;
   const name = layerData.preview.legend_text;
   const geomId = layerData.featuregeom_id.toString();
@@ -47,8 +51,10 @@ async function buildMesh(layerData: MappedFeature) {
     metalness: 0.1,
     roughness: 0.75,
     flatShading: true,
-    side: FrontSide,
+    side: DoubleSide,
     wireframe: false,
+    clippingPlanes: clippingPlanes,
+    clipIntersection: true,
   });
 
   // material.onBeforeCompile = (materialShader) => {
@@ -66,20 +72,20 @@ async function buildMesh(layerData: MappedFeature) {
   mesh.castShadow = true;
   mesh.receiveShadow = true;
 
-  // modelNode should be a THREE.Group object where all the model data gets added to
-  // in the original code modelNode is a direct reference to a THREE.Scene
-  // if (modelNode) {
-  //   modelNode.add(mesh);
-  // }
   return mesh;
 }
 
-export async function buildMeshes(mappedFeatures: MappedFeature[]) {
+export async function buildMeshes(
+  mappedFeatures: MappedFeature[],
+  clippingPlanes: Plane[]
+) {
   const meshes = [];
   for (let i = 0; i < mappedFeatures.length; i++) {
     const layerData = mappedFeatures[i];
-    const mesh = await buildMesh(layerData);
-    meshes.push(mesh);
+    if (layerData.name !== "Topography") {
+      const mesh = await buildMesh(layerData, clippingPlanes);
+      meshes.push(mesh);
+    }
   }
 
   return meshes;

app/three/utils/build-scene.ts

@@ -1,16 +1,8 @@
-import {
-  BoxGeometry,
-  Camera,
-  Mesh,
-  MeshBasicMaterial,
-  PerspectiveCamera,
-  Scene,
-  Vector3,
-  WebGLRenderer,
-} from "three";
+import { Color, PerspectiveCamera, Scene, Vector3, WebGLRenderer } from "three";
 
 import { buildDefaultLights } from "./build-default-lights";
 import { OrbitControls } from "three/addons/controls/OrbitControls.js";
+import { getCenter3D, getMaxSize } from "./utils";
 
 export interface Extent {
   xmin: number;
@@ -26,34 +18,30 @@ let renderer: WebGLRenderer;
 let camera: PerspectiveCamera;
 let scene: Scene;
 export async function buildScene(container: HTMLElement, extent: Extent) {
-  const size = Math.max(
-    extent.xmax - extent.xmin,
-    extent.ymax - extent.ymin,
-    extent.zmax - extent.zmin
-  );
-
-  const center = new Vector3(
-    (extent.xmin + extent.xmax) / 2,
-    (extent.ymin + extent.ymax) / 2,
-    0
-  );
+  const maxSize = getMaxSize(extent);
+  const center = getCenter3D(extent);
 
   const width = container.clientWidth;
   const height = container.clientHeight;
 
-  camera = new PerspectiveCamera(30, width / height, 0.1, size * 25);
-  camera.position.set(center.x, center.y, size * 5);
+  camera = new PerspectiveCamera(
+    50,
+    width / height,
+    maxSize * 0.1,
+    maxSize * 25
+  );
+
+  camera.position.set(center.x, center.y, extent.zmax + 150000);
   camera.lookAt(center);
 
   renderer = new WebGLRenderer({
     alpha: true,
+    logarithmicDepthBuffer: true,
   });
 
   renderer.setPixelRatio(window.devicePixelRatio);
   renderer.setSize(width, height);
   renderer.localClippingEnabled = true;
-  // renderer.autoClear = false;
-  // renderer.setClearColor(0x000000, 0.0); // second param is opacity, 0 => transparent
   renderer.setAnimationLoop(animate);
   window.addEventListener("resize", () => onWindowResize(container));
 
@@ -62,18 +50,16 @@ export async function buildScene(container: HTMLElement, extent: Extent) {
   controls = new OrbitControls(camera, renderer.domElement);
   controls.target.set(center.x, center.y, center.z); // Focus on the center
   controls.enableDamping = true; // Smooth camera movement
+  controls.maxDistance = maxSize * 5;
   controls.update();
 
   // Scene will hold all our elements such as objects, cameras and lights
   scene = new Scene();
+  scene.background = new Color(0xdddddd);
 
   buildDefaultLights(scene);
 
-  // const queryString = window.location.search;
-  // const urlParams = new URLSearchParams(queryString);
-  // const modelid = parseInt(urlParams.get("model_id") ?? "20", 10);
-
-  return { renderer, scene, camera };
+  return { renderer, scene, camera, controls };
 }
 
 function onWindowResize(container: HTMLElement) {

app/three/utils/init.ts

@@ -1,8 +1,10 @@
-import { Group, Vector3 } from "three";
+import { AxesHelper, Group } from "three";
 import { buildMeshes } from "./build-meshes";
 import { Extent, buildScene } from "./build-scene";
 import { getMetadata } from "./get-metadata";
 import { MODEL_ID, SERVICE_URL } from "../config";
+import { createClippingPlane } from "./build-clipping-plane";
+import { buildGrid } from "./build-grid";
 
 export async function init(container: HTMLElement) {
   const modelData = await getMetadata(SERVICE_URL + MODEL_ID);
@@ -18,11 +20,31 @@ export async function init(container: HTMLElement) {
     zmax: modelarea.z.max,
   };
 
-  const { renderer, scene, camera } = await buildScene(container, extent);
-  const meshes = await buildMeshes(mappedFeatures);
+  const { renderer, scene, camera, controls } = await buildScene(
+    container,
+    extent
+  );
 
+  const { planeMesh, plane } = createClippingPlane(
+    renderer,
+    camera,
+    controls,
+    extent
+  );
+  scene.add(planeMesh);
+
+  const clippingPlanes = [plane];
+
+  const meshes = await buildMeshes(mappedFeatures, clippingPlanes);
   const mappedFeaturesGroup = new Group();
   mappedFeaturesGroup.add(...meshes);
   scene.add(mappedFeaturesGroup);
-  // scene.add(meshes[8]);
+
+  const { gridHelper, annotations } = buildGrid(extent);
+  const annotationsGroup = new Group();
+  annotationsGroup.add(...annotations);
+  scene.add(gridHelper, annotationsGroup);
+
+  //const axesHelper = new AxesHelper(5);
+  //scene.add(axesHelper);
 }

app/three/utils/utils.ts

@@ -0,0 +1,18 @@
+import { Vector3 } from "three";
+import { Extent } from "./build-scene";
+
+export function getMaxSize(extent: Extent) {
+  return Math.max(
+    extent.xmax - extent.xmin,
+    extent.ymax - extent.ymin,
+    extent.zmax - extent.zmin
+  );
+}
+
+export function getCenter3D(extent: Extent) {
+  return new Vector3(
+    (extent.xmin + extent.xmax) / 2,
+    (extent.ymin + extent.ymax) / 2,
+    (extent.zmax + extent.zmin) / 2
+  );
+}