I was wondering if there’s any way to use 3js or a similar javascript-based framework to create a 3D object in virtual space (within the browser window) and have text interact with it — ideally projected onto it, or possibly just hidden or distorted by it in some way.
I’m thinking a virtual version of this type of work by Jenny Holzer, where she projects text onto buildings. The text becomes distorted by the contour of the building and disappears around its contours.
this is the image I'm referenceing
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I want to render some graphics, texts and shapes to a bitmap using a canvas-like API like nanovega in D on my server.
I know how to create an arsd window with OpenGL context and render to it, (as per documentation) but is it also possible rendering to a headless context or even directly to draw to some memory buffer? (Because I don't think my server has OpenGL available and would probably need to use some software renderer)
Mainly I wanted to use gradients, texts, shapes, rounded corners, images and masks and render all of that to an image. I know that nanovega implements all of the rendering parts of that, so I would like to keep using it.
I have been working on using Drag and Drop with JavaFX, and one thing I notice is that items are given lowered opacity compared to their actual images, as well as the larger the image the made "Faded/transparent" the image gets. I am working on am application that can drag fairly large items which end up almost invisible when dragging, which defeats the purpose of using a DragView Image in the first place, and makes this unusable for larger items (the way I'm using the DragView I want the images to be a certain size compared to the scene in which I'm dragging onto).
My application essentially has 2 Windows (Stages) where the data is in one Stage and I get the item from a list and drag it onto the scene. The DragView image is a representation of the object going onto the scene, so when I drop the DragView Image, it gets dropped exactly into place on the scene, so the DragView is important to my overall application.
Just a NOTE: There is also backing data in my transfer in order to recreate the box, as well as additional data that gets transferred with the Drag and Drop.
I tried looking at the FX DragView Internal code but didn't find anything that sets the Opacity or anything like that, so one of my assumptions of "it's built into the OS" is something I keep thinking about, as lowered opacity is something I remember being built in, and when trying it it does happen, but very very slight, and not as bad as what I'm experiencing (Also possible that since the icons are much smaller they don't run into the "larger image opacity issue."
I am running Windows 7 64-Bit for those who are wondering.
My question is, is it possible to change the opacity settings of the Drag and Drop ImageView either via JavaFX or possibly Native with using something along the lines of JNI?
I don't have any example code at the moment, but can add if someone is interested, but I'm sure for those who know about Drag and Drop ImageViews should already know about the opacity.
Thank you all.
I have an app, its a small game using opengles with GLKit.
No im wondering how it works when i want to draw text on
my screen (if it is possible).
How can i do it?
i draw all of my game objects using images (wrapped in some kind
of sprite). its possible to scale, to move, and to rotate.
everything works fine.
but finding out how it works to print text on that glkview
gets me deep inside of problems ^^
I dont want to use uiimages cause i also dont know how
to present uiimages on a glkview.
There are a number of ways to do what you want:
1) Have an image with all the text glyphs you need in it. For example, if your application is in English, you'd have the 26 uppercase and 26 lowercase letters in the image. Upload that texture to the GPU and use the proper texture coordinates or glSubTexImage2d() to pull out the glyphs you need. (It's not clear to me if this is what you meant by not wanting a UIImage. It doesn't have to be a UIImage, though that's probably easiest.)
2) Every time you need to display text, draw it on the CPU on the fly, and upload the entire word, phrase, or sentence as a texture. You could create a CGBitmapContext and use Core Graphics to draw text to it. Then upload it using glTexImage2D().
3) Get the individual glyphs out of the fonts and draw directly using the bezier curves that make up the glyphs. This allows for 3D extrusion, too. However, this option is the most time consuming to code and probably least performant. It also involves dealing with the many small problems that fonts have (like degenerate segments, and incorrect winding orders). IF you want to go down this path, I think maybe Core Text can help.
There are at least two clean ways to do this, depending on your requirements.
While documentation advises against compositing over a CAEAGLLayer (GLKView), it works quite well, at least in recent iOS versions, when transparent content is layered on top of the CAEAGLLayer. For example, try dropping a UITextView, with opaque set to false and a clear background color, on top of a GLKView in your Storyboard in Interface Builder in the Apple GLKit template or your app. In my test on an iPhone 5, frame rendering time remained around 1ms, even while scrolling in the text view. If your text needs are static, or you don't want the user to interact with the text, use CATextLayer as a child layer of your EAGLLayer instead of a view.
The second approach is to render the text into a texture. You can then composite the text onto your view by disabling the depth buffer and rendering the texture on a full screen rectangle. Look at UIGraphicsBeginImageContextWithOptions to see how to render to an offscreen image with Quartz. UIGraphicsGetImageFromCurrentImageContext allows you to retrieve the UIImage to use as a texture.
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.
How do I place objects that appear only if the background scrolls to a certain point?
Example- I have this long image that keeps scrolling using the technique above. However, after scrolling to part of the image, I want to add a platform there. How would I do that?
In general, you will probably need to save the locations of your objects in a file and then load that file at the beginning of the level (assuming you are making some kind of platformer game). You can do this by creating a class or a struct containing all the relevant information for the platform (position, size, texture, etc) and then using XML serialization to write an array of those classes/structs to a file.
Your level loader would then load and deserialize the level data, which would end up being a list of all the objects in your level (such as platforms). Now that you have the locations of your platforms in memory you have a couple different options on how to get them to the screen.
Draw all the objects (platforms) all the time, whether or not they are in the view of the camera. If your levels don't contain a lot of objects, this would be simple to implement.
Draw only those in the camera's view. Without knowing how you implemented the horizontal scroller, it's kind of hard to make suggestions for this part. Whatever mechanism you currently have to identify the boundaries of what part of the background to show could be used to determine which objects to draw as well.
I'm working on a game that scrolls vertically right now, and I needed a way to do something similar: place objects in a level and have them appear when the background scrolled to them. I used TorqueX 2D (free engine binaries if you've payed to develop for XNA) and its 2D scene editor to set this up pretty easily. I have my camera scrolling up, the background stays in place. When it gets to an object position defined in the XML level file it spawns the object in the level.