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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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+
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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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+// https://wejn.org/2020/12/cracking-the-threejs-object-fitting-nut/
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+function fitCameraToCenteredObject(camera, object, offset, orbitControls ) {
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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 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.position.set( 0, 0, 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 = new THREE.Vector3(0, 0, 0);
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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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@@ -17,45 +93,33 @@ export function init_3d(path, container, status, div_width, div_height) {
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container.appendChild( renderer.domElement );
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- const light = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- light.position.set(0, 1, 0);
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- scene.add(light);
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-
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- const light42 = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- light42.position.set(1, 0, 0);
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- scene.add(light42);
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-
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- const light23 = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- light23.position.set(0, 0, 1);
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- scene.add(light23);
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-
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- const lightb = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- lightb.position.set(0, -1, 0);
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- scene.add(lightb);
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-
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- const light42b = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- light42b.position.set(-1, 0, 0);
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- scene.add(light42b);
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-
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- const light23b = new THREE.DirectionalLight( 0xffffff, 0.5 );
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- light23b.position.set(0, 0, -1);
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- scene.add(light23b);
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+ const controls = new OrbitControls( camera, renderer.domElement );
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+ controls.enableDamping = true;
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- const light2 = new THREE.AmbientLight(0x101010);
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- light2.position.set(100, 100, 100);
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- scene.add(light2);
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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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+ 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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- const material = new THREE.MeshStandardMaterial();
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- //material.roughness = 0.42;
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+ const material = new THREE.MeshStandardMaterial();
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+ //material.roughness = 0.75;
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- if (path.endsWith(".stl")) {
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const loader = new STLLoader();
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loader.load(
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- //'plot/actuator_all.stl',
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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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scene.add(mesh);
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+ fitCameraToCenteredObject(camera, scene, 0, controls);
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},
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(xhr) => {
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const s = (xhr.loaded / xhr.total) * 100 + '% loaded';
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@@ -68,96 +132,33 @@ export function init_3d(path, container, status, div_width, div_height) {
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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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- //'plot/drumkit.kicad_pcb.wrl',
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- //'plot/dispensy.wrl',
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path,
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function (object) {
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scene.add(object);
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- });
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+ fitCameraToCenteredObject(camera, scene, 0, controls);
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+ },
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+ (xhr) => {
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+ const s = (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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- const controls = new OrbitControls( camera, renderer.domElement );
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- controls.enableDamping = true;
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-
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- // https://wejn.org/2020/12/cracking-the-threejs-object-fitting-nut/
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- const fitCameraToCenteredObject = function (camera, object, offset, orbitControls ) {
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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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- 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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111
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- // figure out the distance created by the appropriate FOV.
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112
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- //
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113
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- // The FOV is always a triangle:
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114
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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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119
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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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127
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- // of the straight line) one has to: `size/2 / Math.tan(F)`.
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128
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- //
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129
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- // FTR, from https://threejs.org/docs/#api/en/cameras/PerspectiveCamera
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130
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- // the camera.fov is the vertical FOV.
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131
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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.position.set( 0, 0, 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 = new THREE.Vector3(0, 0, 0);
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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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- //camera.position.z = 50;
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- fitCameraToCenteredObject(camera, scene, 0, controls)
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+ camera.position.z = 50;
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function render() {
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renderer.render(scene, camera);
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Thomas Buck
8 months ago