Is there such a thing as an edit control (meaning a rectangle of text containing a caret and modify-able by user input) for THREE.js? If so, could somebody give me an example of its use? . and, if not, must this functionality be simulated through DOM/JavaScript?
There is no such control class in three.js. You probably want to work with plain HTML textarea elements. If you want to apply a 2D or 3D transformation to a DOM element, consider to include one of the CSS renderers of three.js into your project:
https://threejs.org/docs/index.html#examples/en/renderers/CSS2DRenderer
https://threejs.org/docs/index.html#examples/en/renderers/CSS3DRenderer
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I'm playing about with three.js and webGL with an attempt to get html objects overlaid on a webGL model.
I intend to use three.js object loaders to render a 3D model, where I can then allow users to overlay HTML DOM objects in 3D space via a custom UI.
I've mainly been using the various different examples in the three.js docs (https://threejs.org/examples/ and https://codepen.io/AdamEDGE/pen/RRjEwz).
In order to allow the user to move the overlaid HTML objects via the UI, I've added the transform controls (https://threejs.org/examples/misc_controls_transform.html).
Things seemed to be going relatively well up to this point, but now I see that the controls are not hoverable or clickable to move the element.
I suspect I'm either missing code or an issue with the camera not aligning correctly, but I'm very new to this so I'm guessing.
I have also experimented with Jerome Etienne's blending tutorials, but on testing that caused other issues and I think may not be worth the trouble for what I'm going for (http://learningthreejs.com/blog/2013/04/30/closing-the-gap-between-html-and-webgl/index.html).
I have created an example that shows the problem (click on an object and the controls should show).
Its a simple webGL torus with two HTML images overlaid and mapped to a Mesh so I can link the controls to the HTML elements which are on a different scene.
https://jsfiddle.net/mattscotty/h5wuq86y/
control = new THREE.TransformControls(camera, glRenderer.domElement);
control.addEventListener('change', render);
The controls show on all the correct places when clicked as expected and I can use the keyboard to change the transform type (again see https://threejs.org/examples/misc_controls_transform.html for how it should work).
As I can't click or hover, I can't hook up to the relevant events.
I'm brand new to this and I'm quite sure I'm missing something obvious, so any help is appreciated.
I'd like to create some mechanism that provides a text overlay on top of my 3D scene at certain times (such as when clicking a mouse button for instance.)
I'm going over the tutorials on github and notice things like the THREE.TextGeometry class. Using it I can put 3D text in the scene, but it may be a bit more than I need-- what I'm really after is a way to put some text on, say, a black background, overlay it on the scene, then move it out of the way when done. Does anyone know of good ways to do this in three.js? (If the THREE.TextGeometry class is a good way to do this that's fine, I'm just not sure how to do the overlay bit.)
Use HTML. It's super easy and powerful especially if you just need an overlay. With CSS, you can also achieve things like semi-transparent background. If you want to have it "blend" to scene, i.e. have perspective etc. you can use THREE.CSS3DRenderer which will transform divs based on camera you supply.
i need some help in my webGL code.
I created a TextGeometry and i included it in a mesh, i didn't have any problem about that. However, i would like updating this text without creating another TextGeometry.
Indeed, my main goal is to translate a text (from right to left) and to make it disappear when he reaches to the left side, but only character by character (like a fade effect).
I tried some attempts : for example, according to text position, deleting it with a :
scene.remove(text)
and creating another text which is the same as previously minus the first character. I don't know if i was clear... But this solution makes my application very slow : that's why i don't want creating an Object every time, but just updating his text property.
I didn't find many help in three.js documentation, may you give me a hand about that ?
Cheers
You could try this:
Create a PlaneGeometry and texture it using the image from a hidden canvas object that contains your text, then apply image transforms to the canvas itself (fading as necessary) and continually update the texture in Three.js as it moves across the scene.
For an example of how to use a canvas object as an image (of text), I have an example posted at: http://stemkoski.github.com/Three.js/Texture-From-Canvas.html
I am trying to create a cube using three.js for a project. I need to add text to vertices and at different points inside the cube. Any idea how this can be done?
For some basic code examples of using Sprite objects in Three.js, check out:
http://stemkoski.github.com/Three.js/Sprites.html
And for an easy way to create images that contain text to use as your sprite textures, check out the sample code at:
http://stemkoski.github.com/Three.js/Texture-From-Canvas.html
I think a combination of these two ideas will achieve what you are looking to do.
If you want to have label-style texts, so that the text begins at a specific point, but is always oriented with the camera and easily readable no matter the camera position, you can use sprites. (example of canvas-created text label sprites: http://i.imgur.com/e9I68xD.jpg - here they are rendered on a separate pass to that they are never obscured by the scene but you can do it on the same pass)
If that's what you are looking for, I'd suggest first checking the Sprites examples, and learn to attach some static image as a sprite to correct position in the scene. After you get that working, you modify the code so that you generate the text to an image canvas using standard Javascript Canvas functions, and using that image as the sprite.
I need functionality like Photoshop polygon selection tool in HTML 5. I tried using HTML5 Path properties and I can draw line on canvas but can't have logic to make that line join and make polygon selection.
You can handle clicks on the canvas and put the click coordinates in an array variable.
You can keep adding the points to path array until the path is complete. A path is complete when the user clicks on the first point after create 3 or more points.
You can use this application to draw your polygon and export it to give you the correct HTML and Javascript canvas statements to produce the polygon on a web page
canvimation