// http://codingtra.in

// http://patreon.com/codingtrain

// Code for: https://youtu.be/IKB1hWWedMk

​

// Edited by SacrificeProductions

​

var cols, rows;

var scl = 20;

var w = 1400;

var h = 1000;

​

var flying = 0;

​

var terrain = [];

​

function setup() {

    createCanvas(600, 600, WEBGL);

    cols = w / scl;

    rows = h / scl;

​

    for (var x = 0; x < cols; x++) {

        terrain[x] = [];

        for (var y = 0; y < rows; y++) {

            terrain[x][y] = 0; //specify a default value for now

        }

    }

}

​

function draw() {

​

    flying = 0;

    var yoff = flying;

    for (var y = 0; y < rows; y++) {

        var xoff = 0;

        for (var x = 0; x < cols; x++) {

            if (mouseIsPressed && mouseX == x && mouseY == y){

                terrain[x][y] += 10;

            }

            terrain[x][y] = map(noise(xoff, yoff), 0, 1, -100, 100);

            xoff += 0.2;

        }

        yoff += 0.2;

    }

​

​

    background(0);

    translate(0, 50);

    rotateX(-PI / 3);

    fill(200, 200, 200, 50);

    noFill();

    strokeWeight(1);

    translate(-w / 2, -h / 2);

    for (let y = 0; y < rows - 1; y++) {

        beginShape(TRIANGLE_STRIP);

        for (let x = 0; x < cols; x++) {

            vertex(x * scl, y * scl, terrain[x][y]);

            vertex(x * scl, (y + 1) * scl, terrain[x][y + 1]);

        }

        endShape();

    }

}