How to use THREE.ImageUtils.loadTexture() in jsfiddle. I have created a demo [ http://jsfiddle.net/georgeneil/cfrsj/10/ ]. Here I am not able to view the texture. I am getting the points rendered as black.
You can base64 encode the image. And then add the string in your code.
Updated jsfiddle: http://jsfiddle.net/cfrsj/11/
The problem is you cannot use a texture that is hosted externally. Here is some code I created to put a texture on a plane. I believe I adapted this code from one of mr doob's projects:
img = new Image();
texture = new THREE.Texture(img);
img.onload = function() {
texture.needsUpdate = true;
makeParticle();
};
img.src = "http://www.aerotwist.com/tutorials/creating-particles-with-three-js/images/particle.png";
geometry = new THREE.PlaneGeometry( 438, 695, 200 );
material = new THREE.MeshBasicMaterial( {map: texture} );
Related
My problem is very basic : I have a texture object, I want to clone it but Texture.clone doesn't seem to work as expected
My code is as basic as my problem :
var canvas = document.createElement("canvas");
canvas.width = canvas.height = 512;
canvas.getContext("2d").fillStyle = "#ff0000";
canvas.getContext("2d").fillRect(0,0,512,512);
var texture = new THREE.Texture(canvas);
texture.needsUpdate= true;
var material = new THREE.MeshBasicMaterial({map:texture});
var mesh = new THREE.Mesh(new THREE.PlaneGeometry(100,100), material);
scene.add(mesh)
//please, don't focus on "scene" and the webglrenderer object,
//it's define on the top of my code but it's not important here.
This code works as expected.
BUT if I change the line containing the material definition by
var material = new THREE.MeshBasicMaterial({map:texture.clone() });
nothing appear on the screen !
Why ?!
EDIT : Thanks to "TheJim01" , I realized that I didn't apply the "needsUpdate = true" on my cloned-texture.
With
var cloneTexture = texture.clone();
cloneTexture.needsUpdate = true;
var material = new THREE.MeshBasicMaterial({map:cloneTexture });
Everything works as expected.
Thank you
I haven't dug into the renderer code, so I don't know how it uses this information, but Texture.needsUpdate increments the "version" of the texture. CanvasTexture sets this right away, causing the version value to be 1 on the first render.
Texture.clone doesn't perpetuate the version information, and instead re-calls its constructor. Because you aren't setting needsUpdate after the clone, you are not following the same steps.
// from your code:
var texture = new THREE.Texture(canvas);
texture.needsUpdate= true;
// texture.version === 1
// but...
var material = new THREE.MeshBasicMaterial({ map:texture.clone() });
//material.map.version === 0
So the clone you're passing into the new material has a version of 0, which is apparently no good if you're using a canvas as the source.
This should resolve the issue:
var material = new THREE.MeshBasicMaterial({ map:texture.clone() });
material.map.needsUpdate = true;
I am new to three js. i want to display a video on plane Geometry . i tried with the following code but it is showing a blank web page with out any errors
var video = document.getElementById('video');
video.src = "***VIDEO URL***";
video.load();
video.play();
var texture = new THREE.VideoTexture(videoImage);
texture.needsUpdate;
texture.minFilter = THREE.LinearFilter;
texture.magFilter = THREE.LinearFilter;
texture.format = THREE.RGBFormat;
texture.crossOrigin = 'anonymous';
var meshPlace = new THREE.Mesh(
new THREE.PlaneGeometry(USE_WIDTH, USE_HEIGHT , 40),
new THREE.MeshBasicMaterial({ map: texture }),);
scene.add( meshPlace );
Think of video as a sequence of images. So to "play" this video on your 3D object - you'll have to pass every single frame of that sequence to your material and then update that material.
Good place to start is here: https://github.com/mrdoob/three.js/wiki/Updates
And here: http://stemkoski.github.io/Three.js/Video.html
I fount this on Using Video as texture with Three.js
Hope this helps :)
I'm pretty new to three.js and I tried for hours to create a skybox/skydome for a better visual feeling to my world (in this case space). Googled, checked tutorials, asked here on StackOverflow. And nothing worked, or I got a silly and dumb answer here on SO. Question is simple: how to make a skybox/dome?
This is how you do a skydome in threejs.
var skyGeo = new THREE.SphereGeometry(100000, 25, 25);
First the geometry. I wanted it big and made it big
var loader = new THREE.TextureLoader(),
texture = loader.load( "images/space.jpg" );
Loads the texture of your background space. One thing here is that you need it to run through a server to be able to load the texture. I use wamp or brackets preview.
Create the material for the skybox here
var material = new THREE.MeshPhongMaterial({
map: texture,
});
Set everything together and add it to the scene here.
var sky = new THREE.Mesh(skyGeo, material);
sky.material.side = THREE.BackSide;
scene.add(sky);
This might not be the best solution for this, but it´s easy specially for a beginner in threejs. Easy to understand and create.
This is how you can load image as texture and apply that on innerside of a sphere geometry to emulate skydome.
Complete solution with error callback for future reference
//SKY
var loader = new THREE.TextureLoader();
loader.load(
"./assets/universe.png",
this.onLoad,
this.onProgress,
this.onError
);
onLoad = texture => {
var objGeometry = new THREE.SphereBufferGeometry(30, 60, 60);
var objMaterial = new THREE.MeshPhongMaterial({
map: texture,
shading: THREE.FlatShading
});
objMaterial.side = THREE.BackSide;
this.earthMesh = new THREE.Mesh(objGeometry, objMaterial);
scene.add(this.earthMesh);
//start animation
this.start();
};
onProgress = xhr => {
console.log((xhr.loaded / xhr.total) * 100 + "% loaded");
};
// Function called when download errors
onError = error => {
console.log("An error happened" + error);
};
I'm trying to apply a texture to a planeGeometry using the three.js engine.
I should be seeing a football field, I'm actually seeing black.
If I replace the map:texture argument with color:0x80ff80, I get a field of solid green, demonstrating that the geometry is in the correct place.
The page contains an which appears in the files before any scripts. I can display that image, demonstrating that there isn't a problem with the image.
The files are being served locally by an http server.
The code I'm using to build the material and PlaneGeometry is below. Any ideas appreciated. Thank you.
function buildField( fieldLength, fieldWidth, scene) {
var image = document.getElementById("fieldTexture");
var texture = new THREE.Texture(image);
texture.minFilter = THREE.LinearFilter;
var geometry = new THREE.PlaneGeometry(fieldLength, fieldWidth, 5, 5);
var material = new THREE.MeshBasicMaterial( {map:texture, side:THREE.DoubleSide});
var field = new THREE.Mesh(geometry, material);
field.rotation.x = -Math.PI/2;
scene.add(field);
}
THREE.ImageUtils is already deprecated. (source)
Use THREE.TextureLoader().load('field.png') instead
Try this, own THREE.js methods usually work better...:
texture = THREE.ImageUtils.loadTexture('field.png');
material = new THREE.MeshBasicMaterial({map: texture});
var field = new THREE.Mesh(geometry, material);
I'm trying the second approach to use Text in three.js, drawing on a canvas and using the result as a texture. It basically works, except for the following problem -don't know if it's a bug:
I create two texts, with transparent background, and overlap then. They show ok, but when I rotate one of them, the transparency is messed up.
I create the text objects with following (excerpt) function
function createText(text, ...){
var textHolder = document.createElement( 'canvas' );
var ctext = textHolder.getContext('2d');
...
var tex = new THREE.Texture(textHolder);
var mat = new THREE.MeshBasicMaterial( { map: tex, overdraw: true});
mat.transparent = true;
mat.map.needsUpdate = true;
var textBoard = new THREE.Mesh(new THREE.PlaneGeometry(textHolder.width, textHolder.height),mat);
textBoard.dynamic = true;
textBoard.doubleSided = true;
return textBoard;
}
and add them to the scene.
See demonstration with full code in jsfiddle
Transparency is tricky in webGL.
The best solution in your case is to do the following for your transparent text material:
mat.depthTest = false;
updated fiddle: http://jsfiddle.net/SXA8n/4/
three.js r.55