I was wondering if there was a way to obtain the bounding box for the models that are inserted via 3dio.js, or otherwise calculate their center points? I'm looking to center them on the origin.
The images below show two models relative to the scene origin indicated by the red box.
You can access the three.js object of the 3d.io entity like this:
var threeElem = document.getElementById("custom-id").components['io3d-data3d'].data3dView.threeParent
Then you can use the native bounding box from three.js:
var bbox = new THREE.Box3().setFromObject(threeElem)
Like that you get the min/max bounds which you can use to determine the origin.
I hope that answers your question. Let me know!
Edit:
for furniture it would probably be
var threeElem = document.getElementById("custom-id").components['io3d-furniture'].data3dView.threeParent
Based on Madlaina's answer. I needed to ensure the model was loaded before
addModelToScene(type) {
let scene = document.querySelector('a-scene');
let model = document.createElement('a-entity');
model.setAttribute('io3d-data3d', getModelKey(type) )
model.addEventListener('model-loaded', () => {
// Access the three.js object of the 3d.io
let threeElem = model.components['io3d-data3d'].data3dView.threeParent
// create the bounding box
let bbox = new THREE.Box3().setFromObject(threeElem)
// Calculate the center-point offsets from the max and min points
const offsetX = (bbox.max.x + bbox.min.x)/2
const offsetY = (bbox.max.y + bbox.min.y)/2
const offsetZ = (bbox.max.z + bbox.min.z)/2
// apply the offset
model.setAttribute('position', {x:-offsetX,y:-offsetY, z:-offsetZ})
} );
scene.appendChild(model);
}
The result:
Related
Can someone pls tell me what i'm doing wrong. I exported a topojson from mapshaper.org. Then I drew the map using the d3. But the map appears zoomed out(very small). How do I get it to be properly scaled and centered. Pls note that i've used some solutions on stackoverflow and I've tried fitExtent. The issue with fitExtent is that I will not be able to translate the map later when I need to. I want the loaded map to appear scaled and centered. Here's the code to draw the map
let width = 900
let height = 500
let svg = null
let chartContainer = null
// load data
let map = {}
const inputFilepath3 = '../Data/nigeria.topojson'
const data = await d3.json(inputFilepath3)
const object = data.objects.gadm36_NGA_1
map.features = topojson.feature(data, object).features
// build container
if (!svg) {
svg = d3.select('body')
.append('svg')
chartContainer = svg.append('g')
.classed('chart-container', true)
}[![enter image description here][1]][1]
svg.attr('width', width)
svg.attr('height', height)
// build scale
const colorScale = d3.scaleOrdinal(d3.schemeCategory10)
// build geopath generator
const projection = d3.geoAzimuthalEqualArea()
const geoPath = d3.geoPath(null).projection(projection)
// draw map
let ps = chartContainer.selectAll('path.state').data(map.features)
ps.exit().remove()
ps.enter().append('path').classed('state', true)
.attr('d', geoPath)
.attr('fill', function(d,i) {
return colorScale(i)
})
How do I use video (mp4) as alpha map in babylonJS?
In three.js applying a video as texture is as simple as assigning the video texture to alphaMap (instead of the diffuse map).
Here's the expected result in three.js - Demo.
I attempted to do the same in babylonJS to no avail. Here's what I have so far babylonJs demo
var mat = new BABYLON.StandardMaterial("mat", scene);
var videoTexture = new BABYLON.VideoTexture("video", ["textures/babylonjs.mp4", "textures/babylonjs.webm"], scene, true, true);
mat.opacityTexture = videoTexture;
Any ideas are welcome.
Thanks
You can use videoTexture.getAlphaFromRGB = true; to use all three channels combined for the alpha. By default it only uses the red channel, which does not have enough variance in the source video for it to show.
The complete example:
var mat = new BABYLON.StandardMaterial("mat", scene);
var videoTexture = new BABYLON.VideoTexture("video", ["textures/babylonjs.mp4", "textures/babylonjs.webm"], scene, true, true);
videoTexture.getAlphaFromRGB = true;
mat.opacityTexture = videoTexture;
If we have NON-axis-aligned box, how can we best check if a point lies inside it? (I'm using three.js, so any utility from there can be of help. Three.js contains bounding box concept, but that is axis-aligned bounding box)
If your box is a THREE.BoxGeometry that is rotated, translated and scaled, then you can use its transformation matrix m to find if it intersects your point v:
transform v and the box by the inverse of m
check if transformed v is inside the transformed box (which is now axis aligned)
Here is the code:
var box = <Your non-aligned box>
var point = <Your point>
box.geometry.computeBoundingBox(); // This is only necessary if not allready computed
box.updateMatrixWorld(true); // This might be necessary if box is moved
var boxMatrixInverse = new THREE.Matrix4().getInverse(box.matrixWorld);
var inverseBox = box.clone();
var inversePoint = point.clone();
inverseBox.applyMatrix(boxMatrixInverse);
inversePoint.applyMatrix4(boxMatrixInverse);
var bb = new THREE.Box3().setFromObject(inverseBox);
var isInside = bb.containsPoint(inversePoint);
And here is a running demonstration: https://jsfiddle.net/holgerl/q0z979uy/
Objective:
To simulate a reflective floor(like this) in three js.
Idea:
Make the floor translucent by setting opacity to 0.5.
Place a Mirror below it to reflect the meshes above it.
Expected Output:
To be able to see reflections of the house via the floor mirror.
Obtained Output:
Doesn't reflect the meshes which is part of the house.
Instead, reflects only the skybox and that too only in certain angles.
Screenshots:
Mirror reflecting skybox fully - http://prntscr.com/6yn52y
Mirror reflecting skybox partially - http://prntscr.com/6yn5f7
Mirror not reflecting anything - http://prntscr.com/6yn5qy
Questions:
Why aren't the other meshes of the house reflected through the mirror?
Why is the mirror not reflecting in certain orientations of the camera?
Code Attached:
.......
.......
function getReflectiveFloorMesh(floorMesh) {
var WIDTH = window.innerWidth;
var HEIGHT = window.innerHeight;
floorMirror = new THREE.Mirror( renderer, firstPerson.camera,
{ clipBias: 0.003,
textureWidth: WIDTH,
textureHeight: HEIGHT,
color: 0x889999 } );
var mirrorMesh = floorMesh.clone();
mirrorMesh.position.y -= 10; // Placing the mirror just below the actual translucent floor; Fixme: To be tuned
mirrorMesh.material = floorMirror.material;
mirrorMesh.material.side = THREE.BackSide; // Fixme: Normals were flipped. How to decide on normals?
mirrorMesh.material.needsUpdate = true;
mirrorMesh.add(floorMirror);
return mirrorMesh;
}
function getSkybox() {
var urlPrefix = "/img/skybox/sunset/";
var urls = [urlPrefix + "px.png", urlPrefix + "nx.png",
urlPrefix + "py.png", urlPrefix + "ny.png",
urlPrefix + "pz.png", urlPrefix + "nz.png"];
var textureCube = THREE.ImageUtils.loadTextureCube(urls);
// init the cube shadder
var shader = THREE.ShaderLib["cube"];
shader.uniforms["tCube"].value = textureCube;
var material = new THREE.ShaderMaterial({
fragmentShader: shader.fragmentShader,
vertexShader: shader.vertexShader,
uniforms: shader.uniforms,
side: THREE.BackSide
});
// build the skybox Mesh
var skyboxMesh = new THREE.Mesh(new THREE.CubeGeometry(10000, 10000, 10000, 1, 1, 1, null, true), material);
return skyboxMesh;
}
function setupScene(model, floor) {
scene.add(model); // Adding the house which contains translucent floor
scene.add(getSkybox()); // Adding Skybox
scene.add(getReflectiveFloorMesh(floor)); // Adds mirror just below floor
scope.animate();
}
....
....
this.animate = function () {
// Render the mirrors
if(floorMirror)
floorMirror.render();
renderer.render(scene, firstPerson.camera);
};
You have to attach the mirror to the mesh before doing any transformation.
So the code would be:
floorMirror = new THREE.Mirror( ... );
var mirrorMesh = floorMesh.clone();
mirrorMesh.add(floorMirror); // attach first!
mirrorMesh.position.y -= 10;
...
But another problem here is that you are cloning mirrorMesh from floorMesh, which has already been (probably) transformed.
At creation, a mirror object has the same default transform matrix as a regular Mesh with plane geometry (which is by default 'vertical').
When you attach the mirror to a floor (or any horizontal mesh), the matrix doesn't match with the mesh one and that's why you don't see the reflections, or only from a certain angle.
So, always attach a mirror to a non-transformed plane mesh, before you apply your transformations (translations or rotations).
Idea:
"Make the floor translucent by setting opacity to 0.5.
Place a Mirror below it to reflect the meshes above it".
I suggest another way, make floor as solid add mirror on top and change the alpha of the mirror instead, I think you have issues with the translucent floor restricting the mirror projection through the alpha..
If you move the mirror over from under the translucent floor or into an empty scene with just a cube or sphere geometry attached basic material does it reflect as expected?
You may need 2 mirrors, one for the room assuming you want polished floor boards and one for outside general reflection
I have created a Sprite in Actionscript and rendered it to a Flex Canvas. Suppose:
var fooShape:Sprite = new FooSpriteSubclass();
fooCanvas.rawChildren.addChild(myshape);
//Sprite shape renders on screen
fooShape.rotation = fooNumber;
This will rotate my shape, but seems to rotate it around the upper-left
point of its parent container(the canvas).
How can I force the Sprite to rotate about is own center point? I could obviously
write code to calculate the rotation, and then have it re-render, but I think there
must be a built-in way to do this, and certainly do not want to 'reinvent the wheel'
if possible.
I am using FlexBuilder, and therefore do not have access to the full Flash API.
Thank you much!
The following steps are required to rotate objects based on a reference point (using Matrix object and getBounds):
Matrix translation (moving to the reference point)
Matrix rotation
Matrix translation (back to original position)
For example to rotate an object 90 degrees around its center:
// Get the matrix of the object
var matrix:Matrix = myObject.transform.matrix;
// Get the rect of the object (to know the dimension)
var rect:Rectangle = myObject.getBounds(parentOfMyObject);
// Translating the desired reference point (in this case, center)
matrix.translate(- (rect.left + (rect.width/2)), - (rect.top + (rect.height/2)));
// Rotation (note: the parameter is in radian)
matrix.rotate((90/180)*Math.PI);
// Translating the object back to the original position.
matrix.translate(rect.left + (rect.width/2), rect.top + (rect.height/2));
Key methods used:
Matrix.rotate
Matrix.translate
DisplayObject.getBounds
Didn't have much luck with the other examples. This one worked for me. I used it on a UIComponent.
http://www.selikoff.net/2010/03/17/solution-to-flex-image-rotation-and-flipping-around-center/
private static function rotateImage(image:Image, degrees:Number):void {
// Calculate rotation and offsets
var radians:Number = degrees * (Math.PI / 180.0);
var offsetWidth:Number = image.contentWidth/2.0;
var offsetHeight:Number = image.contentHeight/2.0;
// Perform rotation
var matrix:Matrix = new Matrix();
matrix.translate(-offsetWidth, -offsetHeight);
matrix.rotate(radians);
matrix.translate(+offsetWidth, +offsetHeight);
matrix.concat(image.transform.matrix);
image.transform.matrix = matrix;
}
Actually I had to add this code to make above solutions work for me.
private var _rotateCount = 0;
var _origginalMatrix:Matrix=new Matrix();
.........
if (_rotateCount++ >= 360 / angleDegrees)
{
myObject.transform.matrix = _origginalMatrix;
_rotateCount = 0;
return;
}
var matrix:Matrix = myObject.transform.matrix;
....
Without that after some long time rotated object slowly moves somewhere right top.
An alternative solution is to put your object inside another View, move it so that your image's center is at the container's top-left corner, and then rotate the container.
import spark.components.*;
var myContainer:View = new View();
var myImage:Image = new Image();
myContainer.addElement(myImage);
myImage.x = myImage.width / -2;
myImage.y = myImage.height / -2;
addElement(myContainer);
myContainer.rotation = whateverAngle;
One issue might be that the width of the image isn't know at the moment it is created, so you might want to find a way around that. (Hardcode it, or see if myImage.preliminaryWidth works)
/**
* Rotates the object based on its center
* Parameters: #obj => the object to rotate
* # rotation => angle to rotate
* */
public function RotateAroundCenter(obj:Object, rotation:Number):void
{
var bound:Rectangle = new Rectangle();
// get the bounded rectangle of objects
bound = obj.getRect(this);
// calculate mid poits
var midx1:Number = bound.x + bound.width/2;
var midy1:Number = bound.y + bound.height/2;
// assign the rotation
obj.rotation = rotation;
// assign the previous mid point as (x,y)
obj.x = midx1;
obj.y = midy1;
// get the new bounded rectangle of objects
bound = obj.getRect(this);
// calculate new mid points
var midx2:Number = bound.x + bound.width/2;
var midy2:Number = bound.y + bound.height/2;
// calculate differnece between the current mid and (x,y) and subtract
//it to position the object in the previous bound.
var diff:Number = midx2 - obj.x;
obj.x -= diff;
diff = midy2 - obj.y;
obj.y -= diff;
}
//////////////////
Usage:
you can use the above function as described below,
var img:Canvas = new Canvas()
RotateAroundCenter(img, rotation);
This will help you
REf: http://subashflash.blogspot.in/2010/08/rotation-of-object-based-on-center.html
If you want to rotate around the center, merely center the asset inside your sprite by setting the internal assets x and y to half of the width and height of the asset. This swill center your content and allow it to rotate around a center point.
An example of runtime loaded assets is as follows:
var loader:Loader = new Loader():
var request:URLRequest = new URLRequest(path/to/asset.ext);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, _onLoaderComplete);
loader.load(request);
private function _onLoaderComplete(e:Event):void
{
var mc:MovieClip = e.target.content as MovieClip;
mc.x = -mc.width * 0.5;
mc.y = -mc.height * 0.5;
mc.rotation = 90;
addChild(mc);
}