I have a spinning Object3D with Sprite labels attached around it. The Sprites are positioned correctly and rotate around with the Object3D, always facing the camera.
I need to draw speech bubble style tails on the labels, and have them point back to the location on the Object3D. This is fairly simple with a line, but gets more complex with a shape.
Green is Object3D cube
Blue is the Shape which needs its rotation.y fixing
White is the Sprite label
So far I have the blue Shape sized and positioned correctly. However the rotation y axis needs to dynamically update vs the Object3D rotation and the camera position. I've tried .lookAt(), but which doesn't work as it rotates all axis. I need only the y rotation to be affected.
Also questioning whether this is the best approach in general?
Thanks!
// Scene setup
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 5;
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var ambientLight = new THREE.AmbientLight(0xffffff, .5);
scene.add(ambientLight);
var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
directionalLight.position.set(1, 1, 1).normalize();
scene.add(directionalLight);
var group = new THREE.Group();
scene.add(group);
// Cube
var cubeSize = 1;
var geometry = new THREE.BoxGeometry(cubeSize, cubeSize, cubeSize);
var material = new THREE.MeshLambertMaterial({
color: 0x00ff00
});
var cube = new THREE.Mesh(geometry, material);
group.add(cube);
// Text label
var config = {
fontface: 'Arial',
fontsize: 64,
fontweight: 500,
lineheight: 1,
padding: 20
};
var text = 'Hello world!';
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
ctx.font = `${config.fontweight} ${config.fontsize}px/${config.lineheight} ${config.fontface}`;
const textMetrics = ctx.measureText(text);
var textWidth = textMetrics.width;
var textHeight = config.fontsize * config.lineheight;
canvas.width = textWidth + config.padding * 2;
canvas.height = textHeight + config.padding * 2;
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, textWidth + config.padding * 2, textHeight + config.padding * 2);
ctx.fillStyle = 'black';
ctx.textAlign = 'left';
ctx.textBaseline = 'top';
ctx.font = `${config.fontweight} ${config.fontsize}px/${config.lineheight} ${config.fontface}`;
ctx.fillText(text, config.padding, config.padding);
var texture = new THREE.Texture(canvas);
texture.needsUpdate = true;
var spriteMaterial = new THREE.SpriteMaterial({
map: texture
});
var aspectRatio = spriteMaterial.map.image.height / spriteMaterial.map.image.width;
var sprite = new THREE.Sprite(spriteMaterial);
sprite.position.set(0, cubeSize * 2, 0);
sprite.scale.set(1, aspectRatio, 1);
group.add(sprite);
// ShapeGeometry Mesh
var arrowWidth = textHeight / 220;
var arrowHeight = sprite.position.y / 1.41;
var arrowShape = new THREE.Shape();
arrowShape.moveTo(0, 0);
arrowShape.lineTo(-arrowWidth / 2, arrowHeight);
arrowShape.lineTo(arrowWidth / 2, arrowHeight);
arrowShape.lineTo(0, 0);
var arrowGeometry = new THREE.ShapeGeometry(arrowShape);
var arrowMaterial = new THREE.MeshBasicMaterial({
color: 0x0000ff,
// depthWrite: false,
side: THREE.DoubleSide
});
var arrow = new THREE.Mesh(arrowGeometry, arrowMaterial);
arrow.position.set(0, cubeSize / 2, 0);
/* arrow.up.copy(new THREE.Vector3(0, 1, 0)); */
group.add(arrow);
window.group = group;
var animate = function() {
requestAnimationFrame(animate);
group.rotation.x += 0.005;
group.rotation.y += 0.005;
group.rotation.z += 0.005;
// Using lookAt with depthWrite:false almost works
// arrow.lookAt(camera.position);
// arrow.rotation.x = 0;
// arrow.rotation.z = 0;
renderer.render(scene, camera);
};
animate();
body {
margin: 0;
}
canvas {
width: 100%;
height: 100%;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/110/three.min.js"></script>
Related
I've created a Ring and would like to have only half of it. And after that animate it, that it builds itself up from 0 to half.
var geometry = new THREE.RingGeometry(10, 9, 32);
var material = new THREE.MeshBasicMaterial({
color: 0xffff00,
side: THREE.DoubleSide,
});
var mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
How can I archive it? I'm new to three.js.
Use thetaStart and thetaLength to animate the half-ring.
body{
overflow: hidden;
margin: 0;
}
<script type="module">
import * as THREE from "https://cdn.jsdelivr.net/npm/three#0.118.3/build/three.module.js";
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, innerWidth / innerHeight, 1, 100);
camera.position.set(0, 0, 10);
var renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize(innerWidth, innerHeight);
document.body.appendChild(renderer.domElement);
var grid = new THREE.GridHelper(10, 10);
grid.rotation.x = Math.PI * 0.5;
scene.add(grid);
var innerRadius = 1;
var outerRadius = 2;
// re-building geometry
var usualRingGeom = new THREE.RingBufferGeometry(innerRadius, outerRadius, 32, 1, 0, 1);
var usualRingMat = new THREE.MeshBasicMaterial({color: 0xffff00});
var usualRing = new THREE.Mesh(usualRingGeom, usualRingMat);
scene.add(usualRing);
var clock = new THREE.Clock();
renderer.setAnimationLoop(()=>{
let t = clock.getElapsedTime();
// re-building geometry
usualRingGeom = new THREE.RingBufferGeometry(innerRadius, outerRadius, 32, 1, 0, (Math.sin(t) * 0.5 + 0.5) * Math.PI);
usualRing.geometry.dispose();
usualRing.geometry = usualRingGeom;
renderer.render(scene, camera);
});
</script>
PS You also can achieve the same result without re-building a geometry. For that, you can bend a plane in js (changing vertices) or in shaders :)
I have a simple 3d cube (BoxGeometry of 100, 100, 100) and I am trying to rotate it. If we call all 100x100x100 a tile - when I rotate it I can see it's overlapping the below tile.
(by changing color, now I totally understand the behaviour).
tl.to(this.cube4.rotation, 0.5, {z: -45* Math.PI/180});
[
What if I want to rotate it based on an anchor point of right bottom? So instead of overflowing inside the below tile, it will overflow that portion to above tile.
So it will look like the green example and not the red example:
The red example here is achieved by
tl.to(this.cube4.rotation, 0.5, {z: -45* Math.PI/180});
tl.to(this.cube4.position, 0.5, {x: 50 }, 0.5);
I am very new to three.js so if any terminology is wrong, please warn me
Add the ("red") cube to a THREE.Group, in that way that the rotation axis (the edge) is in the origin of the group. This means the cube has to be shifted by the half side length.
If you rotate the group object, then the cube (which is inside the group) will rotate around the edge and not around its center.
e.g.
var bbox = new THREE.Box3().setFromObject(cube);
cube.position.set(bbox.min.x, bbox.max.y, 0);
var pivot = new THREE.Group();
pivot.add(cube);
scene.add(pivot);
See also the answer to How to center a group of objects?, which uses this solution to rotate a group of objects.
(function onLoad() {
var camera, scene, renderer, orbitControls, pivot;
var rot = 0.02;
init();
animate();
function init() {
container = document.getElementById('container');
renderer = new THREE.WebGLRenderer({
antialias: true,
alpha: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
container.appendChild(renderer.domElement);
camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 100);
camera.position.set(4, 1, 2);
//camera.lookAt( -1, 0, 0 );
loader = new THREE.TextureLoader();
loader.setCrossOrigin("");
scene = new THREE.Scene();
scene.background = new THREE.Color(0xffffff);
scene.add(camera);
window.onresize = function() {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
}
orbitControls = new THREE.OrbitControls(camera, container);
var ambientLight = new THREE.AmbientLight(0x404040);
scene.add(ambientLight);
var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.5 );
directionalLight.position.set(1,2,-1.5);
scene.add( directionalLight );
addGridHelper();
createModel();
}
function createModel() {
var material = new THREE.MeshPhongMaterial({color:'#80f080'});
var geometry = new THREE.BoxGeometry( 1, 1, 1 );
var cube1 = new THREE.Mesh(geometry, material);
cube1.position.set(0,-0.5,-0.5);
var cube2 = new THREE.Mesh(geometry, material);
cube2.position.set(0,0.5,-0.5);
var cube3 = new THREE.Mesh(geometry, material);
cube3.position.set(0,-0.5,0.5);
var material2 = new THREE.MeshPhongMaterial({color:'#f08080'});
var cube4 = new THREE.Mesh(geometry, material2);
var bbox = new THREE.Box3().setFromObject(cube4);
cube4.position.set(bbox.min.x, bbox.max.y, 0);
pivot = new THREE.Group();
pivot.add(cube4);
pivot.position.set(-bbox.min.x, 0.5-bbox.max.y, 0.5);
scene.add(cube1);
scene.add(cube2);
scene.add(cube3);
scene.add(pivot);
}
function addGridHelper() {
var helper = new THREE.GridHelper(100, 100);
helper.material.opacity = 0.25;
helper.material.transparent = true;
scene.add(helper);
var axis = new THREE.AxesHelper(1000);
scene.add(axis);
}
function animate() {
requestAnimationFrame(animate);
orbitControls.update();
pivot.rotation.z += rot;
if (pivot.rotation.z > 0.0 || pivot.rotation.z < -Math.PI/2) rot *= -1;
render();
}
function render() {
renderer.render(scene, camera);
}
})();
<!--script src="https://threejs.org/build/three.js"></!--script-->
<script src="https://rawcdn.githack.com/mrdoob/three.js/r124/build/three.js"></script>
<script src="https://rawcdn.githack.com/mrdoob/three.js/r124/examples/js/controls/OrbitControls.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tween.js/17.2.0/Tween.js"></script>
<div id="container"></div>
From the first image, it appears that the pivot of your red tile is at its center.
For the rotation you want, you would ideally change the pivot to the lower right of the cube. This is impossible without modifying the geometry of the cube.
BUT a simple trick is to create an empty node at that pivot point, parent your cube to that empty, and apply your rotation to the empty. (Don't forget to remove your translation, you don't need it anymore)
Here is some pseudo code, assuming your red box is centered at (0,0,0) and has a width and height of 100:
// create an empty node at desired rotation pivot
var empty = new Object3D or group
empty.position = (50, -50, 0)
// parent your cube to the empty
var cube = your box
empty.add(cube)
// you may need to change the local position of your cube to bring it back to its global position of (0,0,0)
cube.position = (-50, 50, 0)
rotate empty by 45°
I think you can get the bounds of the rotated object like this:
bounds = new THREE.Box3().setFromObject( theRedObject )
Then reposition the object.y based on its bounds.min.y
let scene, camera, controls, ambient, point, loader, renderer, container, stats;
const targetRotation = 0;
const targetRotationOnMouseDown = 0;
const mouseX = 0;
const mouseXOnMouseDown = 0;
const windowHalfX = window.innerWidth / 2;
const windowHalfY = window.innerHeight / 2;
init();
animate();
var box, b1, b2, b3;
function init() {
// Create a scene which will hold all our meshes to be rendered
scene = new THREE.Scene();
// Create and position a camera
camera = new THREE.PerspectiveCamera(
60, // Field of view
window.innerWidth / window.innerHeight, // Aspect ratio
/*window.innerWidth / -8,
window.innerWidth / 8,
window.innerHeight / 8,
window.innerHeight / -8,
*/
0.1, // Near clipping pane
1000 // Far clipping pane
);
scene.add(camera)
// Reposition the camera
camera.position.set(0, 5, 10);
// Point the camera at a given coordinate
camera.lookAt(new THREE.Vector3(0, 0, 0));
// Add orbit control
controls = new THREE.OrbitControls(camera);
controls.target.set(0, -0.5, 0);
controls.update();
// Add an ambient lights
ambient = new THREE.AmbientLight(0xffffff, 0.2);
scene.add(ambient);
// Add a point light that will cast shadows
point = new THREE.PointLight(0xffffff, 1);
point.position.set(25, 50, 25);
point.castShadow = true;
point.shadow.mapSize.width = 1024;
point.shadow.mapSize.height = 1024;
scene.add(point);
group = new THREE.Group();
group.position.y = 0;
scene.add(group);
rotationAnchor = new THREE.Object3D()
group.add(rotationAnchor);
box = new THREE.Mesh(new THREE.BoxGeometry(), new THREE.MeshStandardMaterial({
color: 'grey'
}))
b1 = box.clone();
b2 = box.clone();
b3 = box.clone();
b3.material = b3.material.clone()
b3.material.color.set('red')
group.add(box);
group.add(b1);
b1.position.y += 1
group.add(b2);
b2.position.z += 1
rotationAnchor.add(b3);
rotationAnchor.position.set(0.5, 0.5, 1.5)
b3.position.set(-.5, -.5, -.5)
// Create a renderer
renderer = new THREE.WebGLRenderer({
antialias: true
});
// Set size
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
// Set color
renderer.setClearColor(0xf8a5c2);
renderer.gammaOutput = true;
// Enable shadow mapping
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
// Append to the document
container = document.createElement("div");
document.body.appendChild(container);
document.body.appendChild(renderer.domElement);
// Add resize listener
window.addEventListener("resize", onWindowResize, false);
// Enable FPS stats
stats = new Stats();
container.appendChild(stats.dom);
var gui = new dat.GUI({
height: 5 * 32 - 1
});
let params = {
'test': 4,
'bevelThickness': 1,
'bevelSize': 1.5,
'bevelSegments': 3
}
gui.add(params, 'test', 0, 10).onChange(val => {
test = val
})
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
rotationAnchor.rotation.z = (Math.cos(performance.now() * 0.001) * Math.PI * 0.25) + (Math.PI * 1.25)
requestAnimationFrame(animate);
// Re-render scene
renderer.render(scene, camera);
// Update stats
stats.update();
}
body {
overflow: hidden;
margin: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/96/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>
<script src="https://threejs.org/examples/js/libs/stats.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.2/dat.gui.min.js"></script>
With a couple of research and examples online I'm able to tween the camera to and fro different position. However, there seems to have a problem when animating to the top view. where the lookat is not able to maintain in the middle and it kind of moves "up" then "down"
how am I able to navigate to the destination smoothly while maintaining center.
https://codepen.io/edwinlimlx/full/QzWBrY
var camera;
var controls;
var scene;
var torus;
var light;
var renderer;
var w = window.innerWidth;
var h = window.innerHeight;
var is3D = true;
var frustumSize = 200;
init();
animate();
function init() {
//WebGL Renderer
renderer = new THREE.WebGLRenderer({
antialias: true
});
//renderer.setClearColor(0xffffff, 1)
renderer.setSize(w, h);
$(".webgl").append(renderer.domElement);
//camera
var aspect = w / h;
camera = new THREE.OrthographicCamera(
frustumSize * aspect / -2,
frustumSize * aspect / 2,
frustumSize / 2,
frustumSize / -2,
1,
1000
);
camera.aspect = aspect;
camera.position.set(frustumSize, frustumSize, frustumSize);
//controls
controls = new THREE.MapControls(camera, renderer.domElement);
controls.minZoom = 1;
controls.maxZoom = 6;
//Scene
scene = new THREE.Scene();
// Helpers
axes = new THREE.AxisHelper(50);
helper = new THREE.GridHelper(200, 10);
scene.add(axes);
scene.add(helper);
// Torus Geometry
torus = new THREE.Mesh(
new THREE.TorusGeometry(60, 30, 20, 20),
new THREE.MeshNormalMaterial()
);
torus.position.set(0, 0, 0);
scene.add(torus);
//Hemisphere Light
// light = new THREE.HemisphereLight(0xffbf67, 0x15c6ff);
// scene.add(light);
$(".click").click(function() {
is3D = !is3D;
var endPos = is3D
? {
x: 200,
y: 200,
z: 200
}
: {
x: 0,
y: 500,
z: 0
};
var lookAt = new THREE.Vector3();
// save original postion and rotation
var startPos = new THREE.Vector3().copy(camera.position);
var startQua = new THREE.Quaternion().copy(camera.quaternion);
// extract the end quaternion
camera.position.set(endPos.x, endPos.y, endPos.z);
camera.lookAt(lookAt);
var endQua = new THREE.Quaternion().copy(camera.quaternion);
// reset original position and rotation
camera.position.set(startPos.x, startPos.y, startPos.z);
camera.quaternion.copy(startQua);
// var tween = new TWEEN.Tween(from)
// .to(to, 600)
// .easing(TWEEN.Easing.Linear.None)
// .onUpdate(function () {
// camera.position.set(this.x, this.y, this.z);
// camera.lookAt(new THREE.Vector3(0, 0, 0));
// })
// .onComplete(function () {
// camera.lookAt(new THREE.Vector3(0, 0, 0));
// })
// .start();
var o = { t: 0 };
new TWEEN.Tween(o)
.to(
{
t: 1
},
1000
)
.onUpdate(function() {
console.log(startPos, endPos, o.t);
var currentPos = new THREE.Vector3().copy(startPos);
currentPos.lerp(endPos, o.t);
camera.position.copy(currentPos);
var currentQua = new THREE.Quaternion().copy(startQua);
currentQua.slerp(endQua, o.t);
camera.quaternion.copy(currentQua);
})
.onComplete(function() {
controls.target = lookAt;
controls.update();
})
.easing(TWEEN.Easing.Linear.None)
.start();
});
}
function animate() {
requestAnimationFrame(animate);
controls.update();
TWEEN.update();
renderer.render(scene, camera);
}
How can I preserve constant size of meshes regardless of perspective using Three.js?
Lets assume I have multiple meshes of the same size. I want them to always have the same on screen size. I also have to use perspective camera.
I have found some related answers, but seems that I miss something:
First approach is to use Euclidean distance to objects from
camera and scale them respectively every animation frame.
Three JS Keep Label Size On Zoom
I have tried to modify jsfiddle given in the answer to apply scale to meshes instead of sprites, but that doesn't work for me. The result looks as follows https://jsfiddle.net/a2ogz9vx/258/
var camera, scene, renderer, controls;
var planets = [];
var timestamp = 0;
var scaleVector = new THREE.Vector3();
init();
animate();
function init() {
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera(90, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(0, 100, 100);
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
controls = new THREE.OrbitControls(camera, renderer.domElement);
var createPlanet = function(name, radius, orbit, speed) {
var geom = new THREE.SphereGeometry(radius, 32, 16);
var mat = new THREE.MeshBasicMaterial({
color: Math.random() * 0xFFFFFF,
});
var planet = new THREE.Mesh(geom, mat);
planet.userData.orbit = orbit;
planet.userData.speed = speed;
var canvas = document.createElement('canvas');
canvas.width = 256;
canvas.height = 256;
var tex = new THREE.Texture(canvas);
tex.needsUpdate = true;
var spriteMat = new THREE.SpriteMaterial({
map: tex
});
var sprite = new THREE.Sprite(spriteMat);
planet.add(sprite);
planets.push(planet);
scene.add(planet);
};
createPlanet("One", 11, -10, 5);
createPlanet("Two", 11, 5, 5);
createPlanet("Three", 11, 10, 5);
}
function animate() {
requestAnimationFrame(animate);
planets.forEach(function(planet) {
var scaleFactor = 100;
var scale = scaleVector.subVectors(planet.position, camera.position).length() / scaleFactor;
planet.scale.set(scale, scale, scale);
var orbit = planet.userData.orbit;
var speed = planet.userData.speed;
planet.position.x = speed * orbit;
planet.position.z = speed * orbit;
});
render();
}
function render() {
renderer.render(scene, camera);
}
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>
Second approach is to use on screen width calculation. https://stackoverflow.com/a/13351534/8465699
Result also doesn't look right https://jsfiddle.net/a2ogz9vx/260/
var camera, scene, renderer, controls;
var planets = [];
var timestamp = 0;
var scaleVector = new THREE.Vector3();
init();
animate();
function init() {
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera(90, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(0, 100, 100);
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
controls = new THREE.OrbitControls(camera, renderer.domElement);
var createPlanet = function(name, radius, orbit, speed) {
var geom = new THREE.SphereGeometry(radius, 32, 16);
var mat = new THREE.MeshBasicMaterial({
color: Math.random() * 0xFFFFFF,
});
var planet = new THREE.Mesh(geom, mat);
planet.userData.orbit = orbit;
planet.userData.speed = speed;
var canvas = document.createElement('canvas');
canvas.width = 256;
canvas.height = 256;
var tex = new THREE.Texture(canvas);
tex.needsUpdate = true;
var spriteMat = new THREE.SpriteMaterial({
map: tex
});
var sprite = new THREE.Sprite(spriteMat);
planet.add(sprite);
planets.push(planet);
scene.add(planet);
};
createPlanet("One", 11, -10, 5);
createPlanet("Two", 11, 0, 5);
createPlanet("Three", 11, 10, 5);
}
function animate() {
requestAnimationFrame(animate);
planets.forEach(function(planet) {
const dist = planet.position.distanceTo(camera.position);
const vFOV = THREE.Math.degToRad(camera.fov);
const size = 2 * Math.tan(vFOV / 2) * dist;
const scaleFactor = 130;
const scale = size / scaleFactor;
planet.scale.set(scale, scale, scale);
var orbit = planet.userData.orbit;
var speed = planet.userData.speed;
planet.position.x = speed * orbit;
planet.position.z = speed * orbit;
});
render();
}
function render() {
renderer.render(scene, camera);
}
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>
Any suggestions how to fix the code or other approaches are welcome!
I'm new at three.js.
In my work, I have to made 3d graphical website.
So after searched in google, I found that three.js is suitable to manipulate WebGL conveniently.
In three.js document(https://threejs.org/docs/#api/en/geometries/TextGeometry),
TextGeometry is API for draw text in the scene.
[src.js]
init = () => {
window.addEventListener('resize', resizeWindow);
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 10000);
var controls = new THREE.OrbitControls( camera );
controls.update();
var renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0xdd3b56);
renderer.setSize(window.innerWidth, window.innerHeight);
// Set shadow
renderer.shadowMap.enabled = true;
// Show Axis
var axes = new THREE.AxisHelper(5);
scene.add(axes);
// Text
var loader = new THREE.FontLoader();
loader.load( './helvetiker_regular.typeface.json', function ( font ) {
var geometry = new THREE.TextGeometry( 'Hello three.js!', {
font: font,
size: 80,
height: 5,
curveSegments: 12,
bevelEnabled: true,
bevelThickness: 10,
bevelSize: 8,
bevelSegments: 5
} );
} );
var textMaterial = new THREE.MeshPhongMaterial({color: 0xFE98A0});
var text = new THREE.Mesh(geometry, textMaterial);
text.position.x = 0;
text.position.y = 10;
text.position.z = 10;
scene.add(text);
// Light
var spotLight = new THREE.SpotLight(0xFFFFFF);
spotLight.position.set(-40, 60, 30);
spotLight.castShadow = true;
spotLight.shadow.mapSize.width = 5120;
spotLight.shadow.mapSize.height = 5120;
scene.add(spotLight);
// Camera Setting
camera.position.x = 0;
camera.position.y = 30;
camera.position.z = 30;
camera.lookAt(scene.position);
document.getElementById("threejs_scene").appendChild(renderer.domElement);
renderScene();
function renderScene() {
requestAnimationFrame(renderScene);
controls.update();
renderer.render(scene, camera);
}
}
window.onload = init();
[index.html]
<html>
<head>
<script src="three.js"></script>
<script src="OrbitControls.js"></script>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="threejs_scene"></div>
<script src="src.js"></script>
</body>
</html>
When I execute my code, it throws [.WebGL-0x7fb612852000]RENDER WARNING: Render count or primcount is 0. and WebGL: too many errors, no more errors will be reported to the console for this context. errors.
So I searched it at google, it occured when Three.js is trying to render an object that does not exist yet.
But in my code, I already defined it.
var textMaterial = new THREE.MeshPhongMaterial({color: 0xFE98A0});
var text = new THREE.Mesh(geometry, textMaterial);
text.position.x = 0;
text.position.y = 10;
text.position.z = 10;
How can I solve this issue?
My last goal is display text in the scene.
Thanks.
window.onload = function(params) {
/*
*
* SET UP THE WORLD
*
*/
//set up the ratio
var gWidth = window.innerWidth;
var gHeight = window.innerHeight;
var ratio = gWidth / gHeight;
var borders = [40, 24] //indicate where the ball needs to move in mirror position
var light = new THREE.AmbientLight(0xffffff, 0.5);
var light1 = new THREE.PointLight(0xffffff, 0.5);
light1.position.set(0, 5, 0);
light1.castShadow = true;
// set the renderer
var renderer = new THREE.WebGLRenderer();
var camera = new THREE.PerspectiveCamera();
camera.position.set(10, 10, 10);
camera.lookAt(new THREE.Vector3(0, 0, 0));
//properties for casting shadow
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
renderer.setSize(gWidth, gHeight);
document.body.appendChild(renderer.domElement);
var scene = new THREE.Scene();
scene.add(light);
scene.add(light1);
var ground = new THREE.Mesh(new THREE.BoxGeometry(10, 0.5, 10), new THREE.MeshLambertMaterial())
ground.receiveShadow = true;
scene.add(ground)
var geometry;
var loader = new THREE.FontLoader();
var mesh;
requestAnimationFrame(render);
function render() {
if (mesh) {
mesh.rotation.y += 0.01;
mesh.rotation.z += 0.007;
}
renderer.render(scene, camera);
requestAnimationFrame(render);
}
loader.load('https://cdn.rawgit.com/mrdoob/three.js/master/examples/fonts/helvetiker_regular.typeface.json', function(font) {
var geometry = new THREE.TextGeometry('Hello three.js!', {
font: font,
size: 80,
height: 5,
curveSegments: 12,
bevelEnabled: true,
bevelThickness: 10,
bevelSize: 8,
bevelSegments: 5
});
var material = new THREE.MeshLambertMaterial({
color: 0xF3FFE2
});
mesh = new THREE.Mesh(geometry, material);
mesh.position.set(0, 2, 0);
mesh.scale.multiplyScalar(0.01)
mesh.castShadow = true;
scene.add(mesh);
var canv = document.createElement('canvas')
canv.width = canv.height = 256;
var ctx = canv.getContext('2d')
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, canv.width, canv.height);
ctx.fillStyle = 'black'
ctx.fillText("HERE IS SOME 2D TEXT", 20, 20);
var tex = new THREE.Texture(canv);
tex.needsUpdate = true;
var mat = new THREE.MeshBasicMaterial({
map: tex
});
var plane = new THREE.Mesh(new THREE.PlaneGeometry(10, 10), mat);
scene.add(plane)
});
}
body {
padding: 0;
margin: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/96/three.min.js"></script>
<html>
<head>
</head>
<body>
</body>
</html>