banksean

// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough banksean@gmail.com

/**
 * You can pass in a random number generator object if you like.
 * It is assumed to have a random() method.
 */

veeneck

// https://www.shadertoy.com/view/4lB3DG
void main() {
    vec4 val = texture2D(u_texture, v_tex_coord);
    vec4 grad = texture2D(u_gradient, v_tex_coord);
     
    if (val.a < 0.1 && grad.r < 0.65 && grad.a > 0.73) {
        vec2 u = gl_FragCoord.xy / u_sprite_size.xy,
        c = vec2(.5) - u;
     
        float t = u_time,

densmoe

//http://stackoverflow.com/questions/31928324/how-to-drag-a-skspritenode-without-touching-it-with-swift/31930669?noredirect=1#comment51852474_31930669

import SpriteKit

class GameScene: SKScene {
    
    var leftShape:ConfinedShape!
    var rightShape:ConfinedShape!
    
    override func didMoveToView(view: SKView) {