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Main.pde

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+PVector camPosition = new PVector(1000, -700, 700);
+PVector lookAt = new PVector(0, 0, -1);
+PVector wind = new PVector(5, -8, 0);
+Terrain terra = new Terrain();
+Balloon balloon = new Balloon(50 * 20, 50 * 20, 20 * 20);
+
+void setup() {
+    fullScreen(P3D);
+    frameRate(144);
+    //size(800, 600, P3D);
+
+    randomSeed(randomSeedValue);
+    noiseSeed(noiseSeedValue);
+    noiseDetail(noiseOctaves, noiseFalloff);
+
+    terra.setup();
+    terra.reloadTrees();
+}
+
+void keyPressed() {
+    if (keyCode == UP) {
+        noiseScale += 0.25;
+        terra.reloadTrees();
+    } else if (keyCode == DOWN) {
+        noiseScale -= 0.25;
+        terra.reloadTrees();
+    }
+}
+
+void draw() {
+    background(173, 216, 230);
+    lights();
+
+    yaw += -1 * sensitivity * (mouseX - pmouseX);
+    pitch += sensitivity * (mouseY - pmouseY);
+
+    pitch = constrain(pitch, -HALF_PI + 0.01, HALF_PI - 0.01);
+
+    float cosPitch = cos(pitch);
+    float sinPitch = sin(pitch);
+    float cosYaw = cos(yaw);
+    float sinYaw = sin(yaw);
+
+    lookAt.x = sinYaw * cosPitch;
+    lookAt.y = sinPitch;
+    lookAt.z = cosYaw * cosPitch;
+
+    if (keyPressed) {
+        if (key == 'g') terra.applyGravity();
+
+        if (key == 'w') camPosition.add(PVector.mult(lookAt, camSpeed));
+
+        if (key == 's') camPosition.sub(PVector.mult(lookAt, camSpeed));
+
+        if (key == 'a') {
+            PVector left = lookAt.cross(new PVector(0, -1, 0));
+            camPosition.add(PVector.mult(left, camSpeed));
+        }
+
+        if (key == 'd') {
+            PVector right = lookAt.cross(new PVector(0, -1, 0));
+            camPosition.sub(PVector.mult(right, camSpeed));
+        }
+        
+       if (key == 'r') terra.blocks.get(0).x += 1;
+       if (key == 'f') terra.blocks.get(0).y += 1;
+    }
+
+    camera(camPosition.x, camPosition.y, camPosition.z, camPosition.x + lookAt.x, camPosition.y + lookAt.y, camPosition.z + lookAt.z, 0, 1, 0);
+    perspective(PI / 3.0, float(width) / float(height), 1, farPlaneDistance);
+
+    terra.drawTerrain(camPosition);
+
+    PVector windForce = wind.copy().mult(0.1);
+    balloon.applyForce(windForce);
+    balloon.draw();
+}