Using three.js, WebGLRenderer and WebGLRenderTarget.
I'm trying to:
1 - render scene A to renderTargetA with renderer A
2 - use renderTargetA.texture on a Mesh added to scene B
3 - render scene B to canvas with renderer B
If I use the same renderer for everything, it works.
But if I act like explained it won't ( It looks like WebGLRenderTarget.texture.image is undefined )
Do you know what's happening (I suppose it's normal for how THREE.js implements render targets) and if there it is a workaround?
Here's a jsfiddle: https://jsfiddle.net/ac30kohj/4/
(switch between lines 66 / 67)
Thanks a lot
Related
I'm looking into making kind of a portal effect using Three.js.
The main idea is to be able to see through multiple windows another Scene.
Exactly like in this example :
https://www.ronja-tutorials.com/post/022-stencil-buffers/ (See gif in article, too big to upload here)
I found an exact example of what i'm trying to do using three.js.
Here is the link :
https://sites.google.com/site/cgwith3js/home/masking-with-stencil
The fiddle was not working but I changed it to make it work :
http://jsfiddle.net/yzhreu6p/23/
scene = new THREE.Scene();
sceneStencil = new THREE.Scene();
...
scene.add(box); // red one
...
function animate() {
requestAnimationFrame(animate);
renderer.clear();
// animate the box
box.position.x = Math.cos(clock.getElapsedTime()) * 10;
var gl = renderer.getContext();
// enable stencil test
gl.enable(gl.STENCIL_TEST);
//renderer.state.setStencilTest( true );
// config the stencil buffer to collect data for testing
gl.stencilFunc(gl.ALWAYS, 1, 0xff);
gl.stencilOp(gl.REPLACE, gl.REPLACE, gl.REPLACE);
// render shape for stencil test
renderer.render(sceneStencil, camera);
// set stencil buffer for testing
gl.stencilFunc(gl.EQUAL, 1, 0xff);
gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);
// render actual scene
renderer.render(scene, camera);
// disable stencil test
gl.disable(gl.STENCIL_TEST);
}
Then I reuse the code in my project where I have kind of a town with buildings, and the hidden scene has a nyan cat textured box.
The problem I'm having is that the planes are disappearing when a building is behind and more serious problem, when there are buildings back the nyan cat texture, we see the texture in the building.
To better explain here is an image
I'm looking for a solution where the images are not visible inside the building, I found people that are talking about stencilMask but it's new for me.
Do I need to create another scene to make it work independently ?
If someone can help me, thank you for reading.
I have a 3D model in .obj format. However the coordinates for this 3D model are not (0,0,0). This a 3D render of drone imagery so the coordinates are actual georeferenced coordinates.
I'm following the example in Three.js on how to load an obj with its mtl on webgl. I use the original HTML except that I simply replace the obj listed as male02 by CerroPelaoLow and the files are placed in the obj directory. Firefox displays the model correctly but the position is the problem.
Note that this render is generated by a program this way and even though I can manipulate the model with a program such as Meshlab I'd still prefer the minimum manipulation possible.
So how can I use local coordinates of my object or focus the camera and then use a different set of controls?
You can use the boundingSphere or boundingBox of your object's geometry to determine the position and of your camera. I have already implemented a functionality to focus an object or a set objects. So, here I share some code:
// assuming following variables:
// object -> your obj model (THREE.Mesh)
// camera -> PerspectiveCamera
// controls -> I'm also using OrbitControls
// if boundingSphere isn't set yet
object.computeBoundingSphere();
var sphere = object.geometry.boundingSphere.clone();
sphere.applyMatrix4( object.matrixWorld );
// vector from current center to camera position (shouldn't be zero in length)
var s = new THREE.Vector3().subVectors( camera.position, controls.center );
var h = sphere.radius / Math.tan( camera.fov / 2 * Math.PI / 180 );
var newPos = new THREE.Vector3().addVectors( sphere.center, s.setLength(h) );
camera.position.copy( newPos );
controls.center.copy( sphere.center );
I am trying to make use of Raycaster in a ThreeJS scene to create a sort of VR interaction.
Everything works fine in normal mode, but not when I enable stereo effect.
I am using the following snippet of code.
// "camera" is a ThreeJS camera, "objectContainer" contains objects (Object3D) that I want to interact with
var raycaster = new THREE.Raycaster(),
origin = new THREE.Vector2();
origin.x = 0; origin.y = 0;
raycaster.setFromCamera(origin, camera);
var intersects = raycaster.intersectObjects(objectContainer.children, true);
if (intersects.length > 0 && intersects[0].object.visible === true) {
// trigger some function myFunc()
}
So basically when I try the above snippet of code in normal mode, myFunc gets triggered whenever I am looking at any of the concerned 3d objects.
However as soon as I switch to stereo mode, it stops working; i.e., myFunc never gets triggered.
I tried updating the value of origin.x to -0.5. I did that because in VR mode, the screen gets split into two halves. However that didn't work either.
What should I do to make the raycaster intersect the 3D objects in VR mode (when stereo effect is turned on)?
Could you please provide a jsfiddle with the code?
Basically, if you are using stereo in your app, it means you are using 2 cameras, therefore you need to check your intersects on both cameras views, this could become an expensive process.
var cameras =
{ 'camera1': new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000),
'camera2': new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000)
};
for (var cam in cameras) {
raycaster.setFromCamera(origin, cameras[cam]);
//continue your logic
}
You could use a vector object that simulates the camera intersection to avoid checking twice, but this depends on what you are trying to achieve.
I encountered a similar problem, I eventually found the reason. Actually in StereoEffect THREE.js displays the meshes on the two eyes, but in reality is actually adds only one mesh to the scene, exactly in the middle of the line left-eye-mesh <-> right-eye-mesh, hidden to the viewer.
So when you use the raycaster, you need to use it on the real mesh on the middle, not the illusion displayed on each eye !
I detailled here how to do it
Three.js StereoEffect displays meshes across 2 eyes
Hopes it solves your problem !
You can use my StereoEffect.js file in your project for resolving problem. See example of using. See my Raycaster stereo pull request also.
How can I render an exported scene (with many objects, each with different colors and different properties, such as rotation aroung an axis in the scene) from Blender (with colladaLoader -->.dae) in ThreeJs?
So, the first step is to learn how to create a scene in threeJs and learn some feature with Blender. When you are ready, create your first model and before exporting keep this in mind:
you need to an object with vertices, so if you just create a text with Blender, you have to convert it to a mesh, otherwise threeJs will not render it
be sure to choose the Blender render option and not the Cycles,
otherwise the .dae you export will not be rendered in threeJs
when applying a texture, use just colors and basic materials (basic, phong and lambert) - the others will not work using the colladaLoader
to see if the object will be rendered with color in threeJs with
colladaLoader just look at object in Blender with object mode
(solid) - if it's gray and not colored of the color you choose, it
will be rendered in threeJs the same way
if you apply the 'solidify' modifier to the object and then on threeJs set it to transparent, it will be rendered as wireframed
if you append multiple objects in the scene and 'join' them, the
respective positions and rotations will be respected in threeJs,
otherwise not: for example, if you want to renderize a flower in the
bottle (and thoose objects are different blender files which are
appended/linked in the scene), the flower will not fit in the bottle
in threeJs, but would have a different position and rotation than
the bottle
grouping the objects will not solve this: to see the scene as you see it in Blender you have to 'join' the objects (with the consequences that this entails) or manually change position and rotation on threeJs
the .dae export options don't matter for the rendering of the object in threeJs
and now, the part that regards threeJs:
be sure to import the colladaLoader with:
<script src="jsLib/ColladaLoader.js"></script>
insert this code into your init() function so the loader will load your .dae model:
var loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load( 'model.dae', function ( collada ) {
// with this you can get the objects of the scene; the [0] is not the first object
// you display in blender in case of many objects (which means you didn't join them)
var obj1 = collada.scene.children[0];
// you can name the object so you can use it even out of the function, if you want
// animate it for example obj1.name = "daeObj1";
// you can set here some material properties as trasparency
obj1.material.needsUpdate = true;
obj1.material.transparent = true;
obj1.material.opacity = 0.5;
obj1.hearth.material.wireframe = false;
// and now some position and rotation for good visualization
obj1.position.set(0, -5, -0.6); //x,z,y
obj1.rotation.set(0, 45, 0);
// and add the obj to the threeJs scene
scene.add(obj1);
});
and some code to the animate() function if you want to update some of your objects, with rotation for example
scene.traverse (function (object) {
if (object.name === 'daeObj1') {
object.rotation.z -= 0.01;
}
});
I hope someone will benefit from this post
I'm trying to make the following in three.js:
I made the model in sketchup with some simple coloured textures and used the collader importer, the result looks like this:
Now I want to dynamically load some photographs onto each of the different planes, however what I end up with is this:
So as you can see, each image is loaded but they are very small and repeated across the rest of the surface.
This is how I load the textures: (preloadTexture() is just a simple preloader)
for(i in cubeSidesArray)
{
preloadTexture(modelThumbsArray[i]);
var newTexture = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture(modelThumbsArray[i]) } );
cubeSidesArray[i].material = newTexture;
}
How do I get the textures to fill the surface?
Thanks!
Edit - I played with the model in sketchup and managed to get it a little better, but not much!
Edit 2 - Still no luck, I'm starting to think building it in code from scratch would be simpler
Option 1: I would advise you to do or next.
1 -.Import the model blender
2 -.Export blender to threejs
3 -.Use this method of charging.
AgregarModeloBlender function (geometry, materials) {
console.log(materials);
material = new THREE.MeshFaceMaterial( materials );
modelo3d_ = new THREE.Mesh( geometry,material );
escenario.add(modelo3d_);
modelo3d_.add(camera);
modelo3d_.scale.set(5,5,5);
modelo3d_.position.set(-900,25,850);
modelo3d_.rotation.y=Math.PI;
}
4 -. Subsequently trabajr with textures independently.
Example: http://all.develoteca.com/builder/
Option 2: I would advise you to do or this:
1 -. Create the geometric shape (vertices) to modify each of the faces of the texture.
Example: http://develoteca.com/Panel/
Greetings.