I need to add a picture to a spacetree to serve as a background to a spacetree.
I have tried several ways but succeeded at none, mainly for the following 2 reasons:
- positioning on the canvas (coordinates 0,0 do not seem to be the correct positioning. it is in the minus!)
- each time the spacetree redraws, it clear the canvas.
Any help will be sincerely appreciated.
guys, what I did is straight forward: if you use the example from the infovis spacetree,
please add the following right after :
st.compute();
//optional: make a translation of the tree
st.geom.translate(new $jit.Complex(-200, 0), "current");
//what I added
//where myimage is an image I load in the DOM normally.
var ctx = st.canvas.getCtx();
var imageObj = document.getElementById("myimage");
ctx.drawImage(imageObj, -700, -500);
Related
i need a (nameplate) sprite without sizeAttenuation in Three.js and it should looks like this example:
//load image with 256x128px 32bit png
var spriteMap = new THREE.TextureLoader().load("tex/plates/mytest.png");
var spriteMat = new THREE.SpriteMaterial({map:spriteMap, transparent:true, sizeAttenuation:false});
var sprite = new THREE.Sprite(spriteMat);
...
spriteMat.map.minFilter = THREE.NearestFilter;
The result is not blurry, but its not correctly and hav some artefacts what i dont want:
Here is my second try with (THREE.LinearFilter), also not what i want cos its too blurry:
Renderer size: 1200x800px (not full window)
So, i dont know if its a problem with the filter, position or scaling. The first example seems like a bitmap text, but i really dont know how i can solve this problem. I also dont need a 2d sprite in screenspace. I need the nameplate in 3d worldspace behind other objects. I have really no idea how i can solve this, pls anyone can help me with this problem?
i want to render a texture on the background and the 3dscene in the foreground. i used the effectcomposer to do this.
how ever my first pass (the background) seems to be "overwritten" with the 2nd pass (the scene) the result only the scene gets drawn with a black background. it looks like the background of the second pass isnt drawn transparent or the transparancy is lost.
http://jsfiddle.net/mdwzx1f8/8/
var renderTex = new THREE.TexturePass(myTex);
var renderScene = new THREE.RenderPass(scene, camera);
composer.addPass(renderTex);
composer.addPass(renderScene);
var effectCopy = new THREE.ShaderPass(THREE.CopyShader);
effectCopy.renderToScreen = true;
composer.addPass(effectCopy);
i hope someone can take a quick look at it and point me in the right direction
thanks in advance
Updates:
07/07/2015
I tried clearing the zbuffer with renderer.clear(false, true, false);
Found a post on masking which i looked at but it wasnt added to
threejs as far as i can tell
https://github.com/mrdoob/three.js/issues/2448
08/07/2015
Found another interesting page https://github.com/mrdoob/three.js/issues/5979 not sure if this is related yet
Updated the fiddle if you comment line 53 you will see the 1st pass which should be visible if the scene background is drawn transparent
Bobafett in the threejs irc channel helped me out and he found my issue, it turns out that i called:
renderer.autoClear = false;
instead onrenderer.autoClearColor = false;
Here is the modified and working fiddle:
http://jsfiddle.net/mdwzx1f8/9/
I would like to thank all who have helped me in the search for the solution
I have found a tutorial on parallax scrolling in spritekit using objective-C though I have been trying to port it to swift without much success, very little in fact.
Parallax Scrolling
Does anyone have any other tutorials or methods of doing parallax scrolling in swift.
This is a SUPER simple way of starting a parallax background. WITH SKACTIONS! I am hoping it helps you understand the basics before moving to a harder but more effective way of coding this.
So I'll start with the code that get a background moving and then you try duplicating the code for the foreground or objects you want to put in your scene.
//declare ground picture. If Your putting this image over the top of another image (use a png file).
var groundImage = SKTexture(imageNamed: "background.jpg")
//make your SKActions that will move the image across the screen. this one goes from right to left.
var moveBackground = SKAction.moveByX(-groundImage.size().width, y: 0, duration: NSTimeInterval(0.01 * groundImage.size().width))
//This resets the image to begin again on the right side.
var resetBackGround = SKAction.moveByX(groundImage.size().width, y: 0, duration: 0.0)
//this moves the image run forever and put the action in the correct sequence.
var moveBackgoundForever = SKAction.repeatActionForever(SKAction.sequence([moveBackground, resetBackGround]))
//then run a for loop to make the images line up end to end.
for var i:CGFloat = 0; i<2 + self.frame.size.width / (groundImage.size().width); ++i {
var sprite = SKSpriteNode(texture: groundImage)
sprite.position = CGPointMake(i * sprite.size.width, sprite.size.height / 2)
sprite.runAction(moveBackgoundForever)
self.addChild(sprite)
}
}
//once this is done repeat for a forground or other items but them run at a different speed.
/*make sure your pictures line up visually end to end. Just duplicating this code will NOT work as you will see but it is a starting point. hint. if your using items like simple obstructions then using actions to spawns a function that creates that obstruction maybe a good way to go too. If there are more then two separate parallax objects then using an array for those objects would help performance. There are many ways to handle this so my point is simple: If you can't port it from ObjectiveC then rethink it in Swift. Good luck!
Before, there is image:
I am totally new in Titanim(Appcelerator). There is task: I must draw or import and select the definite regions of circle. When clicked, it must change colour. Your help will be appreciated.
With regards
Plz Keep two images one with new background and one with original background.Just change the image path and you would be good to go.Something like this
Ti.UI.backgroundColor = 'white';
var win = Ti.UI.createWindow();
var image = Ti.UI.createImageView({
image:'/images/myimage.png'
});
image.addEventListener('click',function(e){
image.image="images/newimage";
});
win.add(image);
win.open();
For some time, I've been trying to figure out how to do an object selection outline in my game. (So the player can see the object over everything else, on mouse-over)
This is how the result should look:
The solution I would like to use goes like this:
Layer 1: Draw model in regular shading.
Layer 2: Draw a copy in red color, scaled along normals using vertex shader.
Mask: Draw a black/white flat color of the model to use it as a stencil mask for the second layer, to hide insides and show layer 1.
And here comes the problem. I can't really find any good learning materials about masks. Can I subtract the insides from the outline shape? What am I doing wrong?
I can't figure out how to stack my render passes to make the mask work. :(
Here's a jsfiddle demo
renderTarget = new THREE.WebGLRenderTarget(window.innerWidth, window.innerHeight, renderTargetParameters)
composer = new THREE.EffectComposer(renderer, renderTarget)
// composer = new THREE.EffectComposer(renderer)
normal = new THREE.RenderPass(scene, camera)
outline = new THREE.RenderPass(outScene, camera)
mask = new THREE.MaskPass(maskScene, camera)
// mask.inverse = true
clearMask = new THREE.ClearMaskPass
copyPass = new THREE.ShaderPass(THREE.CopyShader)
copyPass.renderToScreen = true
composer.addPass(normal)
composer.addPass(outline)
composer.addPass(mask)
composer.addPass(clearMask)
composer.addPass(copyPass)
Also I have no idea whether to use render target or renderer for the source of the composer. :( Should I have the first pass in the composer at all? Why do I need the copy pass? So many questions, I know. But there are just not enough resources to learn from, I've been googling for days.
Thanks for any advice!
Here's a js fiddle with working solution. You're welcome. :)
http://jsfiddle.net/Eskel/g593q/6/
Update with only two render passes (credit to WestLangley):
http://jsfiddle.net/Eskel/g593q/9/
The pieces missing were these:
composer.renderTarget1.stencilBuffer = true
composer.renderTarget2.stencilBuffer = true
outline.clear = false
Now I think I've found a bit simpler solution, from the THREEx library. It pre-scales the mesh so you dont need a realtime shader for it.
http://jeromeetienne.github.io/threex.geometricglow/examples/geometricglowmesh.html