How to create animation like bubble? - animation

I want the outline of the circle moving around to have a nice effect

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ThreeJS page/scene transition

I am trying to figure out the concept on how this site (http://igoodi.eu/) do its transition between different objects. Like when you are in the homepage and try to scroll down, the scene rotates vertically (maybe 90degrees). I want to know on how to do this or maybe the concept behind this.
The thing is I want to implement a three faces/pages (Triangular Prism) in a website. And the transition will be like it would rotate horizontally and it will display the other face of the triangle.

Libgdx | Set black color to everything outside of circle

How can I set a black color to the whole screen, excluding a shaperenderer circle? The circle is basically my game world, anything that leaves it shouldn't be visible. Is there some way to create a reverse circle pixmap (eg..A circle, but inverted) to overlay everything except for the circle game area? Or maybe a way to clear the screen, excluding parts? Thanks!
You could try the approach you mentioned in the comments. Using a black image with a circular hole in it. Then have each assigned to a different camera much in the same way you would set up a HUD in libgdx.
You might want to take a look at shaders, this approach is really flexible and lets you even control how rapid the transition is. Just the basics of GLSL should be sufficient.
https://www.youtube.com/watch?v=caQZKeAYgD8 Here's a decent tutorial.

How does one override "draw" in a CCNode?

I am creating a side scrolling game.
I compute all the points representing what a terrain should look like by doing the following:
The points representing the top of the hill are determined by using a sin function.
The bottom of the hill is just the bottom of the screen.
The left and right edges of the terrain, are the left and right edges of the screen, where the x coords are x=0, and x= screen width.
But I don't know how to draw it on screen, and "fill" it with some other texture. (A predetermined PNG image or something).
How does one override the draw method of a CCNode or CCSprite to accomplish this ?
In the example below I would use a square png image of stars, which I would like to repeat as I scroll the terrain from left to right.
Edit: In the tutorial below, they do all kinds of calculations and wrap a sprite around the hills. But I just want to do something simple, like fill the hills with a simple "noise" texture (no stripes etc), or a solid color. How can I do that?
: http://www.raywenderlich.com/32954/how-to-create-a-game-like-tiny-wings-with-cocos2d-2-x-part-1
EDIT: To clarify: I know one can override the draw method. But I don't know what code to put in it to accomplish the problem I described above.
Create a new class that subclasses CCNode or CCSprite, and add a draw method:
- (void) draw {
}
The draw method will automatically execute each frame. Put whatever "drawing" code you like within it.

Zoom invariant objects in webgl

WebGl doesn't support line thickness. So when I need to highlight some line, I just draw rectangle around it. But when I zoom scene it looks pretty scary.
There are two ways I see now:
1) Recalculate rectangle width according to canvas.width into model coordinates.
2) Place all zoom-invariant objects under separate matrix (I use scenejs) and recalculate their positions after each mousewheel
I don't like both of this solution. So I wonder: is there good workaround to make items zoom invariant?
Another way around that (not the most efficient one though) might be to use shaders. In our WebGL app, we render highlighted primitives into a texture and then blur it back on screen to add a "selection glow effect".

How do I animate clouds?

I have 3 nice and puffy clouds I made in Photoshop, all the same size, now I would like to animate them so they appear like they were moving in the background. I want this animation to be the base background in all my scenes (menu,settings, score, game).
I'm using cocos2d, I have setup the menus and the buttons so the work but how do I accomplish this?
I was thinking to add this as a layer, any other suggestions?
Can anyone show me how some code how to make this please?
David H
A simple way to do it is with sine and cosine. Have slighly different parameters (period and amplitude) to ensure that the user doesn't realise (as easily) that they are programmatically animated.
You may also want to play with animating the opacity value. I'm not sure if layers have those, otherwise you'll have to add the clouds to separate nodes or images and applying it to them.
It's hard to be more specific without knowing what the images look like.
The simplest way to animate anything is to add the sprite to the scene, set the position and call something like...
[myClouds runAction:[CCMoveBy actionWithDuration:10 position:CGPointMake(200, 0)]];
This will slide the sprite 200px to the right over 10 seconds. As Srekel suggested, you can play around with some trig functions to get a more natural feel and motion paths, but you'll have to schedule a selector and iteratively reposition the elements.
The more difficult part of your questions is about getting the animation in the background of all scenes. Keep in mind that when you switch scenes, you're unloading one node hierarchy and loading a new one. The background cannot be shared. You CAN, however, duplicate the sprites and animation in all scenes, but when you transition between them there will be a jump.

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