Goal: I want to create a Web based experience where the user need to see a series of elements on the scene and later, I want to leave the user explore alone.
I have several objects around the scene and I want the camera to look at them one by one. I am using the lookat() method but is not working correctly. I found this example on Threejs:
http://jsfiddle.net/L0rdzbej/135/
But my example is not working like the previous example.
After the answer of #Mugen87 is working but with a little modification:
document.getElementById('cam').sceneEl.camera.lookAt
Access the camera in this way. You can see the example here:
https://glitch.com/~aframe-lookat-cam-not-working
Please click on the button "animate camera".
As mentioned in this thread, you have to remove or disable look-controls if you're overriding camera rotation manually. So you can do:
var cameraEl = document.getElementById('camera');
cameraEl.setAttribute('look-controls', {enabled: false});
to disable the controls, perform your lookAt() operations, and then enable the controls via:
cameraEl.setAttribute('look-controls', {enabled: true})
I finally could make it worked. I am new in Threejs and aframe and surely I don't understand rotation, positions,world coordinates good enough but I think I did a decent work. Here the link:
https://glitch.com/~aframe-lookat-camera-working
I hope will be useful for somebody on the future.
Related
I am trying to take a 'snapshot' of a babylon3d scene ... in other words: I am trying to clone a babylon3d canvas when a user presses a button, and then append the new <canvas> to the <body> .. Sometimes it works, but other times it does not.
However, if I use a simple canvas (ie. by using fillRect), the cloning/appending always works as expected.
I have set up a test on plunker to demonstrate my problem: plunker: press the button over and over again to see how sporadic it behaves when there is a babylon scene. AND NOTE: You can toggle between the simple canvas and the babylon canvas from within the _jquery(document).ready(...) handler.
thanks, Shannon
This is because from version 2.3.0 of Babylonjs :
Engine now initialize WebGL with preserveDrawingBuffer = false by default.
You need to initialize the Engine by passing a {preserveDrawingBuffer: true} object as third parameter.
Forked plnkr
But this will unfortunately kill your canvas' performances.
See more about it here.
I'm not really a specialist of Babylonjs, and I didn't find a way to make a call from scene.render method where we could use the flag method proposed by
#CapsE. But there is a BABYLON.Tools.CreateScreenshot(engine, camera, size) method, which will make a downloadable png from your scene ; maybe this could help you.
First please excuse my bad english writing and please note that I am a Javascript NOOB!
I am currently developing a website for a client where I am presenting different kind of "wood cut" in webgl but I am unable to get the desired look an feel...
My goal is to make the viewer look and react like what we can see at Sketchfab.
http://sketchfab.com/show/9f7e1e088f0943b697e809f224f8c76d
The rotation is limited to a certain angle and the model always stay in the right position... With Trackballcontrols the model rotate all the way and its a mess. I have tried to change the quaternion as follow:
from:
_this.object.up.applyQuaternion( quaternion );
to:
_this.object.up.applyQuaternion( new THREE.Vector4(0,0,0,1) );
but it behave weird when I reach a certain angle, the model become jumpy...
Then I tried with Orbitcontrols but it seems that there is no dynamicDamping because the controls are really "dry". I prefer a smoother effect...
1- So is there a way to use Orbitcontrols and get the dynamicDamping to work?
2- Is it possible to modify Trackballcontrols to get the desired result?
an example of my models are here:
http://www.boissilvac.ca/new/nosproduits/patron19
Thank you for your time
I am working on a program, that uses THREE.RollControls, when the user goes too far away from the center of the screen, they tend to get lost, so I am working on creating a function that reorients them, facing the center of the scene.
What I had intened to do was simply call the following:
camera.lookAt(scene.position)
However, this has no affect. From what I was reading on different stack overflow questions specifically this:
ThreeJS camera.lookAt() has no effect, is there something I'm doing wrong?
It seems like their solution was to do the camera position change using the controls, rather then changing the camera itself.
I do not believe there is any 'Target' in the Roll Controls, so I don't know how I can reset where the camera is looking at based on a THREE.Vector3() Is there a simple way to do this, or will I basically have to:
So far I have 'attempted' to do the follow:
- Calculate the difference of position of the camera with the position of the scene.
- Normalize this vector
- Subtract it from the direction forward of the camera
- use this vector in controls.forward.add(thisVector)
but this doesn't do at all what I want (probably because I have no idea what I'm doing)
Thank you in advance for your time!
Isaac
The same thing bugged me too about the RollControls but I took a different approach in solving the problem. Since the controls are in the example code (in r55) you can modify the controls, as they are not part of the core library. You can see my modifications at http://www.virtuality.gr/AGG/EaZD-WebGL/js/three.js/examples/js/controls/RollControls.js
I introduced a local variable called mouseLook because I could not use the this.mouseLook. I initialized it to false and I only make it true when there is a button press i.e. when navigating in the scene. That solved my problem.
Im trying to use last threejs version to load a Collada Loader. Furthermore, I just want to make a mouse over events.
I've been reading (and analyzing a lot of examples) about this on related forum, there is a problem about intersectObjects (this function makes possible mouse over evet).
Question is simple: How can I code mouse over events on pieces of my model?
Here is my example but It is not using the latest version of the threejs library.
Nothing else at the moment, I think It is so hard to begin with this library, there isn't so much documentation...
My root issue is when mouse is out of canvas, threejs detects mouse over some piece of my model and through the event... I think if I update threejs this may be fixed
Thank you!!!
As far as I can see you already implemented intersectObjects.Try using this on your canvas:
position : absolute,
top : 0px
Seems to me that you dont use the right mousePosition for the calculation. Try using the relative mousePosition of the canvas and not of the document. And I would not check for intersection on every render call. Maybe on a mouseMove event or on an interval.
I am new on the JavaScript and HTML. I am on learning process. I successfully made a cube and textured it. I also want to add different html link to open pages in "iframe".
I used the example of http://mrdoob.github.com/three.js/examples/canvas_geometry_cube.html
This is what I did http://olcaysahin.com/pages/cube.html
If anyone knows any tutorial or similar approach to make each face clickable, appreciated.
Thanks
Have a look at http://mrdoob.github.com/three.js/examples/canvas_interactive_cubes.html.
The from variable intersects, you can determine which face was clicked on from either the faceIndex or the face normal.