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void setup(){
size(640,360,P3D);
noStroke();
colorMode(RGB,1);
fill(0.4);
}

void draw(){
background(0);
translate(width/2, height/2);
lightSpecular(1,1,1);
directionalLight(0.8,0.8,0.8,0,0,-1);
float s = mouseX / float(width);
specular(s,s,s);
sphere(120);
}