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Now that we know how to do noise in 1D, it's time to move on to 2D. In 2D, instead of interpolating between two points of a line (rand(x) and rand(x)+1.0), we are going to interpolate between the four corners of the square area of a plane (rand(st), rand(st)+vec2(1.,0.), rand(st)+vec2(0.,1.) and rand(st)+vec2(1.,1.)).