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+/*
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+ * 3d.js
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+ *
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+ * Copyright (c) 2024 Thomas Buck (thomas@xythobuz.de)
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+ *
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+ * For the fitCameraToObject() function also:
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+ * Copyright (c) 2024 Michal Jirků
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+ * https://wejn.org/2020/12/cracking-the-threejs-object-fitting-nut/
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+ *
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+ * For everything else:
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * See <http://www.gnu.org/licenses/>.
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+ */
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+
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+import * as THREE from 'three';
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+import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+import { STLLoader } from 'three/addons/loaders/STLLoader.js'
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+import { VRMLLoader } from 'three/addons/loaders/VRMLLoader.js';
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+
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+function fitCameraToObject(camera, object, offset, orbitControls, yOffset) {
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+ const boundingBox = new THREE.Box3();
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+ boundingBox.setFromObject( object );
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+
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+ var middle = new THREE.Vector3();
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+ boundingBox.getCenter(middle);
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+
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+ var size = new THREE.Vector3();
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+ boundingBox.getSize(size);
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+
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+ // figure out how to fit the box in the view:
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+ // 1. figure out horizontal FOV (on non-1.0 aspects)
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+ // 2. figure out distance from the object in X and Y planes
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+ // 3. select the max distance (to fit both sides in)
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+ //
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+ // The reason is as follows:
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+ //
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+ // Imagine a bounding box (BB) is centered at (0,0,0).
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+ // Camera has vertical FOV (camera.fov) and horizontal FOV
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+ // (camera.fov scaled by aspect, see fovh below)
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+ //
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+ // Therefore if you want to put the entire object into the field of view,
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+ // you have to compute the distance as: z/2 (half of Z size of the BB
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+ // protruding towards us) plus for both X and Y size of BB you have to
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+ // figure out the distance created by the appropriate FOV.
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+ //
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+ // The FOV is always a triangle:
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+ //
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+ // (size/2)
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+ // +--------+
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+ // | /
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+ // | /
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+ // | /
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+ // | F° /
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+ // | /
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+ // | /
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+ // | /
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+ // |/
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+ //
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+ // F° is half of respective FOV, so to compute the distance (the length
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+ // of the straight line) one has to: `size/2 / Math.tan(F)`.
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+ //
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+ // FTR, from https://threejs.org/docs/#api/en/cameras/PerspectiveCamera
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+ // the camera.fov is the vertical FOV.
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+
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+ const fov = camera.fov * ( Math.PI / 180 );
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+ const fovh = 2*Math.atan(Math.tan(fov/2) * camera.aspect);
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+ let dx = size.z / 2 + Math.abs( size.x / 2 / Math.tan( fovh / 2 ) );
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+ let dy = size.z / 2 + Math.abs( size.y / 2 / Math.tan( fov / 2 ) );
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+ let cameraZ = Math.max(dx, dy);
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+
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+ // offset the camera, if desired (to avoid filling the whole canvas)
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+ if( offset !== undefined && offset !== 0 ) cameraZ *= offset;
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+
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+ camera.target = middle;
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+ camera.position.set( middle.x, middle.y + yOffset * cameraZ, middle.z + cameraZ );
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+
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+ // set the far plane of the camera so that it easily encompasses the whole object
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+ const minZ = boundingBox.min.z;
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+ const cameraToFarEdge = ( minZ < 0 ) ? -minZ + cameraZ : cameraZ - minZ;
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+
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+ camera.far = cameraToFarEdge * 3;
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+ camera.updateProjectionMatrix();
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+
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+ if ( orbitControls !== undefined ) {
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+ // set camera to rotate around the center
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+ orbitControls.target = middle;
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+
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+ // prevent camera from zooming out far enough to create far plane cutoff
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+ orbitControls.maxDistance = cameraToFarEdge * 2;
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+ }
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+}
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+
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+export function init_3d(path, container, status, div_width, div_height) {
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+ const width = div_width;
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+ const height = div_height;
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+
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+ const scene = new THREE.Scene();
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+ //scene.add(new THREE.AxesHelper(1));
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+
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+ const camera = new THREE.PerspectiveCamera(75, width / height, 0.1, 1000);
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+
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+ const renderer = new THREE.WebGLRenderer({ antialias: true });
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+ renderer.setSize(width, height);
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+
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+ const controls = new OrbitControls(camera, renderer.domElement);
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+ controls.enableDamping = true;
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+ controls.autoRotate = true;
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+
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+ for (const i of [1, -1]) {
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+ for (const j of [0, 1, 2]) {
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+ const light = new THREE.DirectionalLight(0xffffff, 0.5);
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+ light.position.set(i * (j == 0 ? 1 : 0),
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+ i * (j == 1 ? 1 : 0),
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+ i * (j == 2 ? 1 : 0));
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+ scene.add(light);
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+ }
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+ }
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+
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+ if (path.endsWith(".stl")) {
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+ const light_amb = new THREE.AmbientLight(0x424242);
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+ scene.add(light_amb);
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+
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+ const material = new THREE.MeshStandardMaterial();
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+ //material.roughness = 0.75;
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+
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+ const loader = new STLLoader();
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+ loader.load(
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+ path,
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+ function (geometry) {
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+ const mesh = new THREE.Mesh(geometry, material);
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+ mesh.rotation.setFromVector3(new THREE.Vector3(-Math.PI / 2, 0, 0));
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+ scene.add(mesh);
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+ fitCameraToObject(camera, scene, 0, controls, 0);
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+ controls.update();
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+ status.textContent = "Loaded STL 100%";
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+ },
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+ (xhr) => {
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+ const s = Math.floor((xhr.loaded / xhr.total) * 100) + '% loaded';
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+ console.log(s);
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+ status.textContent = s;
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+ },
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+ (error) => {
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+ console.log(error);
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+ status.textContent = error;
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+ }
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+ );
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+ } else if (path.endsWith(".wrl")) {
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+ const light_amb = new THREE.AmbientLight(0xffffff);
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+ scene.add(light_amb);
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+
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+ const loader = new VRMLLoader();
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+ loader.load(
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+ path,
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+ function (object) {
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+ scene.add(object);
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+ fitCameraToObject(camera, scene, 0, controls, 0);
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+ controls.update();
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+ status.textContent = "Loaded VRML 100%";
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+ },
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+ (xhr) => {
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+ const s = Math.floor((xhr.loaded / xhr.total) * 100) + '% loaded';
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+ console.log(s);
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+ status.textContent = s;
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+ },
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+ (error) => {
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+ console.log(error);
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+ status.textContent = error;
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+ }
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+ );
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+ } else {
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+ const s = "error: unknown filetype for " + path;
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+ console.log(s);
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+ status.textContent = s;
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+ }
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+
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+ camera.position.z = 50;
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+ controls.update();
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+
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+ function animate() {
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+ requestAnimationFrame(animate);
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+ controls.update();
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+ renderer.render(scene, camera);
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+ }
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+
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+ animate();
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+ status.textContent = "3D model ready!";
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+
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+ container.appendChild(renderer.domElement);
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+
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+ const div = document.createElement("div");
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+ div.style.position = "absolute";
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+ div.style.left = "5px";
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+ div.style.top = "5px";
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+ div.style.background = "white";
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+ div.style.color = "black";
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+ container.appendChild(div);
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+
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+ const chk_ar = document.createElement("input");
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+ chk_ar.type = "checkbox";
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+ chk_ar.checked = true;
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+ chk_ar.addEventListener('change', function() {
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+ controls.autoRotate = this.checked;
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+ });
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+
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+ const div_ar = document.createElement("div");
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+ div_ar.appendChild(chk_ar);
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+ div_ar.appendChild(document.createTextNode("Auto-Rotate"));
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+ div.appendChild(div_ar);
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+
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+ const btn_rst = document.createElement("input");
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+ btn_rst.type = "button";
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+ btn_rst.value = "Reset Camera";
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+ btn_rst.addEventListener('click', function() {
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+ fitCameraToObject(camera, scene, 0, controls, 0);
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+ controls.update();
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+ });
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+
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+ const div_rst = document.createElement("div");
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+ div_rst.appendChild(btn_rst);
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+ div.appendChild(div_rst);
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+}
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Thomas Buck
3 weeks ago