I have two cubes and one KeyFrameTrack per cube (with different changing time and position data for each cube). I would like to display the KeyFrameTracks with following code:
// mesh of cube one
mixer = new THREE.AnimationMixer( mesh );
// cube two
mixer1 = new THREE.AnimationMixer( mesh1 );
var clipAction = mixer.clipAction( clip );
var clipAction1 = mixer1.clipAction( clip1 );
clipAction.play();
clipAction1.play();
However, only the first „clip“ gets played. How can I play both clips at the same time?
Thank you.
Related
How can I put a text next or in front of it or on its surface with three.js?
If I plot a object like a box, I'd like to give this object a visible name (so similar to tooltip, but always staying visible). Would be great if text size is adjusting to distance like object size.
const geometry = new THREE.BoxGeometry( 1, 1, 1 );
const material = new THREE.MeshBasicMaterial( {color: 0x00ff00} );
const cube = new THREE.Mesh( geometry, material );
scene.add( cube );
I'm using three.js with react-force-graph to render a diagram. Objects within it are rendered with three.js
https://threejs.org/docs/#api/en/geometries/BoxGeometry.parameters
Two ways to draw text with three.js. First, create a div element, set its position (In your case, you need to write code to calculate the position relative to the canvas according to the position of camera and 3d object). Second, create a text texture.
I have model far away from the origin, and I want a directional light to hit the model like sunlight would do.
I set a position and a target for my DirectionalLight:
export const dirLight = getDirectional();
function getDirectional() {
const dirLight = new DirectionalLight( 0xffffff, 1 );
dirLight.position.set( 585000 + 10000, 6135000 + 10000, -500 + 5000);
return dirLight;
};
const helper = new THREE.DirectionalLightHelper( dirLight, 1000 );
let t = new THREE.Object3D();
t.translateX(585000);
t.translateY(6135000);
t.translateZ(1000);
dirLight.target = t;
scene.add(dirLight);
scene.add(dirLight.target);
scene.add(t);
helper.update();
scene.add( helper );
I would expect the light direction now to be parallel to vector between light position and light target, but apparently the light direction is still towards the origin of the scene. What am I doing wrong ?
A running example can be seen here
The documentation states that the target needs to be added to the scene so that the world coordinates are calculated. However, that does not seem to work.
So, instead I tried manually updating the world coordinates, and that worked. Probably that will only work with a static target.
In your case that would be adding
dirLight.target.updateMatrixWorld();
I would like to display two different cubes animated via KeyFrameTracks. Following examplary KeyFrame Three.js code has been adopted. How can I integrate a second animated cube moved via KeyFrameTracks? Thx
// create an animation sequence with the tracks
// If a negative time value is passed, the duration will be calculated from the times of the passed tracks array
var clip = new THREE.AnimationClip( 'Action', 3, [ scaleKF, positionKF, quaternionKF, colorKF, opacityKF ] );
// setup the AnimationMixer
mixer = new THREE.AnimationMixer( mesh );
// create a ClipAction and set it to play
var clipAction = mixer.clipAction( clip );
clipAction.play();
The idea is to use AnimationObjectGroup. An instance of this class represents a group of objects that receives a shared animation state. After creating the group, you add the respective meshes to it. In the next step, you pass this group to the animation mixer as its root object.
const animationGroup = new THREE.AnimationObjectGroup();
animationGroup.add( mesh1 );
animationGroup.add( mesh2 );
const mixer = new THREE.AnimationMixer( animationGroup );
https://threejs.org/examples/misc_animation_groups
three.js R104
I'm working on an app where I visualize ATV trails in a 3d perspective (NAIP imagery draped over elevation data). I am using three.js for the rendering engine.
In the above image, the white line you see is just a THREE.Line instance, where I convert a trails gps coordinates into threejs coordinates. I'd like to add more of 3d perspective to this line. I tried implementing a THREE.TubeGeometry where the path was a THREE.CatmullRomCurve3 using the same Vector3 points as how I built the line you see in the image above. That did not produce a desirable result...
From the many, many THREE examples I have looked at, I really think an extruded geometry would achieve the look I am after... But I cant for the life of me figure out how to extrude a geometry for the line. Any suggestions/thoughts?
UPDATE 1:
Here is my desired look (same trail - no imagery). This image was produced in QGIS using the Q2Threejs plugin
UPDATE 2: Here is a code of how I have attempted to create a tubegeometry. Maybe I am messing something up in there...
// trailVectors are an array of Vector3 - same as ones used to create line
var trailCurve = new THREE.CatmullRomCurve3(trailVectors);
var tubeGeometry = new THREE.TubeGeometry(trailCurve,80,1,15,false);
var material = new THREE.MeshBasicMaterial({color:0x00ff00});
var tubeMesh = new THREE.Mesh(tubeGeometry,material);
var wireframeMaterial = new THREE.LineBasicMaterial({color:0xffffff,lineWidth:2});
var wireframe = new THREE.Mesh(tubeGeometry,wireframeMaterial);
tubeMesh.add(wireframe);
scene.add(tubeMesh);
UPDATE 3
THREE.TubeGeometry(trailCurve,80,4,2,false) per mzartman request
I think that you should be able to achieve what you want with a TubeGeometry. I think the big thing is that your example (from the picture shown) has more than 2 radius segments. That gives it the tubular shape and makes it look sort of like a blob. If you set the radial segment count to 2 (as it's shown below) then I think it would look a lot better.
tubeGeometry = new THREE.TubeBufferGeometry(
[YOUR_PATH_HERE],
params.extrusionSegments, // <--- Edit this for higher resolution on the spline
3, // <--- This defines the height
2, // <--- This 2 keeps 2D (i.e. not a tube!!!!)
true );
var mesh = new THREE.Mesh( geometry, material );
var wireframe = new THREE.Mesh( geometry, wireframeMaterial );
mesh.add( wireframe );
scene.add( mesh );
Update:
I think that you might do better with a material that shows some shadow like the MeshPhong. Also, to do the wireframe you want to add it as an option in the material initialization. Give it a show with the following:
var tubeGeometry = new THREE.TubeGeometry(curve,80,1,2,false);
var material = new THREE.MeshPhongMaterial({color:0x00ff00, wireframe: true});
var tubeMesh = new THREE.Mesh(tubeGeometry,material);
scene.add(tubeMesh);
I am trying to build a virtual tour inside a building (the whole building is an obj model) using three.js. Everything loads fine and the library is pretty straightforward. My most critical issue is that I can't implement collision detection with the camera, I tried using rays but I couldn't find a suitable example for my case.
My model load:
var loader = new THREE.OBJMTLLoader();
loader.addEventListener( 'load', function ( event ) {
var newModel = event.content;
newModel.traverse( function ( child ) {
if ( child instanceof THREE.Mesh ) {
child.castShadow = true;
child.receiveShadow = true;
}
} );
scene.add( newModel );
objects.push( newModel );
});
loader.load( 'model/model.obj', 'model/model.mtl' );
The camera creation (I don't know if it is relevant to the issue)
camera = new THREE.PerspectiveCamera(
45,
window.innerWidth / window.innerHeight,
1,
10000
);
camera.position.set( 0, 25, 0 );
camera.lookAt( 0, 0, 0 );
NOTE: The camera moves inside the model, I don't want to detect collision between two separate obj models, I want to detect collision (and stop the camera from passing through walls) inside one single model.
Any help will be greatly appreciated
Looking at the documentation for Raycaster in Three.js at http://threejs.org/docs/58/#Reference/Core/Raycaster, you can create a ray like Raycaster( origin, direction, near, far ). Perhaps for you this would look something like
var ray = new THREE.Raycaster(camera.position, cameraForwardDirection, camera.position, collisionDistance);
Where cameraForwardDirection is the direction in front of you camera. I think you can get this by doing something like:
var cameraForwardDirection = new THREE.Vector3(0,0,-1).applyMatrix4(camera.matrixWorld);
This should work because the camera points in the negative Z direction (hence the 0,0,-1) and we want to apply the orientation of the camera to this vector. This assumes you are only moving forward. If you wanted to check for collisions in other directions, you could cast rays in other directions.
collisionDistance would be the minimum distance for a collision. You can experiment with this to find what works with respect to the scale of things in your scene.
Once you have cast this ray, you will need to check for intersections. You can use the ray.intersectObject( object, recursive ) method. Since it seems like you just have that one model, it might look something like:
var intersects = ray.intersectObject(newModel, true);
if(intersects.length>0){
// stop the camera from moving farther into the wall
}