I have done quite a few hours of google search to see if this can be done
within the three.js environment.
I want to create a glow effect based on a TextGeometry and not a simple primitive like a sphere or cube object similar to the one in Lee StemKoski - shadow glow example below.
I have been reading and experimenting with Lee StemKoski examples
In particular with his Shader Glow example which as stated works well with simple objects but not with complex geometric shapes. Therefore I was wondering if there are any work arounds to this or other suggestions to how one could create a glow effect around text.
regards
w9914420
UPDATE: I decided to go with the mapping concept by attaching an image to the text I can create a glow effect. In this example I used a circle, but should not be too difficult to do a map for the text that I need.
UPDATE: 20/3/17 - So I had an attempt at using the theeX.atmosphere material to create that elusive text glow effect. Here are some of the results.
As you can see not quite there yet - the issue that I have is I am not able to smooth the vertices of the outer glow text more. I am not sure if it is possible any advice appreciated.
Native code used to create effect.
//normal text created
var geometry2 = threeLab.asset.simpleText('hello','my_font');
var materialme = new THREE.MeshNormalMaterial();
var mesh = new THREE.Mesh( geometry2, materialme );
this.scene.add( mesh );
// we create a secondary text object to use as glow
var geometry = threeLab.asset.simpleText('hello','my_font');
// clone for manipulation
var geoclone = geometry.clone();
//Thes functions are need to make it work in this case
geoclone.mergeVertices();
//geoclone.computeCentroids();
geoclone.computeVertexNormals();
geoclone.computeFaceNormals();
// part of threex library to make the glow scale and expand
THREEx.dilateGeometry(geoclone, 0.5);
var materialz = THREEx.createAtmosphereMaterial();
var meshHalo = new THREE.Mesh(geoclone, materialz );
//we have now our glow
this.scene.add( meshHalo );
So In the end I increased the bevelsegments of my secondary TextGeometry object which helped to smooth it. I was then able to encase my first text into the second like so:
With further tweaking I will be able to get the glow effect more subtle, but for now the effect works.
Thank you all for the input :)
Related
I'm currently working on a piece of code that loads up a 3D image which initially isn't visible. It is supposed to be visible, however, after scaling and translating it, but no matter what I do, the screen remains black and I cannot see the 3D image.
I won't post the entire code but here's the section about the scaling and translating (the code portions that I've commented out is what I tried to implement as the solution):
const box = new THREE.Box3().setFromObject(object);
// object.scale.set( 2, 2, 2 );
// box.getCenter(object.position);
// object.geometry.center();
scene.add( object );
I'm confused whether I'm misunderstanding Box3, whether it has to do with the order in which I'm scaling/centering, or if it's my values, or something trivial that I'm forgetting to add.
EDIT: I believe that I need to properly size the bounding box around the image, and use that to scale the tiger. I'm still confused about this, because I assumed this line already did that:
const box = new THREE.Box3().setFromObject(object);
So I'm not sure how I can change the size of the bounding box so it is correct, and then scale it to the size I want.
I am trying to make a cube with given 6 faces lying on the surface as a cube net with one face movable. Something like this:
In the above picture, there are 6 faces, one face ( blue one) is movable.
One can rotate them up together along their edges to form a “net”.
Once they think they are finished, they can press a “fold it” button – all edges turn up 90 degrees to create the cube (or may not be a cube if he hasn't joined the blue face at proper position.)
Below is intermediate status after pressing "fold it" button.
After the faces are folded it should like this:
The corresponding animation is given here: http://www.mathematikus.de/10/
(somehow that link is not working on mac)
I am not sure how to go about this. Any help is appreciated.
Thanking you in advance.
You can use hierarchy of objects.
var obj1 = new THREE.Mesh(...);
var obj2 = new THREE.Mesh(...);
obj1.add(obj2);
There's a good example of it.
So, using this principle, I made animation for folding the cube, given in your question. Of course, this is not the ultimate solution, this is just a starting point.
jsfiddle example
upd: I've updated the fiddle. You can start folding by clicking the PressMe button. Animation made with Tween.js (see the foldTheCube() function)
I want to disable lighting entirely in three.js, and render a 3D object. Currently, since lighting is active in some form, the object appears completely black. I have no calls to any sort of lighting currently in my program, and I have been unable to find a solution with searching.
Edit: Code
var white = 0xFFFFFF;
var facemat = new THREE.MeshBasicMaterial( { color: white, opacity: 1.0, shading: THREE.FlatShading } );
vrmlLoader.addEventListener('load', function ( event ) {
var object = event.content;
object.material = facemat;
scene.add(object);
});
vrmlLoader.load("ship.wrl");
My questions for this particular post have mostly been answered. If I am to ask more I will drive this post off topic.
Shading / lighting take care of drawing an object in such a way that you can perceive its depth. In your example picture, shading is disabled - there is no depth, the object is the same everywhere - you cannot differentiate parts of it.
Now, it should be pretty obvious that you can't draw stuff without colour - just like you can't draw on a piece of paper without pencils or any other tool. What you are seeing is simply your object drawn with black colour. What you want to see is your object drawn in white, which is almost the same but if you do that currently, you'll see nothing since your background is white!
Anyway, after those clarifications, here is a how-to:
Change the background colour of your renderer to white:
renderer.setClearColor(0, 1)
Change the colour of your object by changing its material:
object.material = new THREE.MeshBasicMaterial(0xFFFFFF)
I need to use my own gemetry since the default cube does not look like it should in wireframe mode (now it is made of triangles instead of squares).
So I made my own geometry and it looks ok, but the raycaster does not work as good with my own objects as it does with the built-in cubes.
var cube = new THREE.Line( getCube( 5,5, 5), new THREE.LineDashedMaterial( { color: 0x000000,dashSize: 1, gapSize: 0.1, linewidth: 2 } ),THREE.LinePieces );
where getCube() returns
var geometry = new THREE.Geometry()
See example:
http://jsfiddle.net/QHjSM/12/
6 colour filled box on the top are the defalt THREE.CubeGeometry boxes, and selecting them with raycaster works perfect, 6 wireframe are my custom geometry.
Issues:
If you try to click outside the box, but pretty close to it it will catch the box, and if you click inside the box (in the middle of it) it will not catch it neither.
But the most annoying thing is that if you click inside one box, but close to another one sometimes it catches not the wrong one.
I'm not sure can it be done better, tried all the geometry.compute... methods, but still no effect.
Good day, your custom cubes are not in fact cubes. They are just a stack of lines with no cooresponding faces. Your selection is not returning as expected due to the fact that your "cubes" indeed have gapping holes right threw them. What you can do is in your getCube function after you've built the vertices you can then build all your faces in a similar way.
Have a look at this example: Issue with custom geometry and face normal
Generally you'll need to carefully pattern out every 3 set of vertices so that when you build the faces there in a clock-wise direction so that the normals will be computerd correctly. Here's a basic example of adding a face.
geometry.faces.push(new THREE.Face3(1,2,3));
BUT! Note that this will result in the same aforementioned diagonal lines through your wireframe. So, for your use case why not simply use both the basic cube mesh with picking and remove the wireframe then overlay the line drawn boxes as your custom wireframe. Best of both worlds.
FYI, you probably already know but Face4 is gone, so you'll need to use Face3 and some sort of custom wireframe to do this anyway.
Edit:
I did a little test to your fiddle, noticed something strange. Using the CanvasRender, even with the wireframe off the default cube you still see the diagonal lines! I try WebGLRenderer and it's fine. I'll have to look into that one further.
CanvasRenderer
http://jsfiddle.net/QHjSM/13/
WebGLRenderer
http://jsfiddle.net/QHjSM/14/
Me again, hmm it appears those ghosted face lines are visible in all the CanvasRenderer examples that use a MeshBasicMaterial on the Three.js site. The only thing I was able to do was simply reduce the opacity of the cube mesh material to 0.1 to lessen the effect. I suppose the only other method is to switch to the WebGLRenderer but I look forward to being wrong on this :) Here's the last test
http://jsfiddle.net/QHjSM/16/
I have a really simple scene which has one .dae mesh in it, and a 7000*7000 plane underneath the mesh. I'd like it to be lit by a high SpotLight, so the mesh throws a shadow on the ground. But, something seems to be broken! No matter how high I put the SpotLight, it never lights up the plane! Also, it lights the mesh up only a little, while it is in a small square (perimeter).
You can see the situation here:
As soon as I move the mesh (a monster) around, it wont be lit anymore.
This is how I instantiate the light:
// create a spotlight
self.spotLight = new THREE.SpotLight();
// set its position
self.spotLight.position.y = 1000; //I recon it needs to be relatively high so it lights up everything
self.spotLight.position.x = 0; //(0, 0) are the coordinates where the mesh is spawned, and are the center of the plane
self.spotLight.position.z = 0;
self.spotLight.castShadow = true;
This is how the plane is made:
//The plane.
self.plane = new THREE.Mesh(new THREE.PlaneGeometry(self.groundSize, self.groundSize), new THREE.MeshLambertMaterial({color: 0x5C8A00}));
self.plane.receiveShadow = true;
self.plane.position.x = 0;
self.plane.position.y = -26;
self.plane.position.z = 0;
Also, here's another picture, this time, I've added a lot of PointLights:
You can see how the shadow still disappears!
Now, what am I doing wrong here? AFAIK, light should disperse equally in all directions! And also, there is another problem, I seem to be unable to add multiple SpotLights on the scene! Everything slows down completely if I do so - is this intended? Maybe it's because I enabled shadows on all of them...
#Neil, the same thing happens in your code as well!
I have created a jsfiddle showing a plane with Lambert material and a rotating cube that is casting a shadow, maybe you can see what is different to yours.
edit
Try playing about with some of the params, I can stop the clipping on my demo with:
spotLight.shadowCameraFov = 70;
update demo and moving demo