Terrain Sketch on Raspberry PI

terreno.rb

attr_reader :terrain, :rows, :columns, :mover

WIDTH = 1400
HEIGHT = 1100
SCL = 30

def settings
  size 800, 800, P3D
end

def setup
  # sketch_title 'Terreno' # sketch_title doesn't work with P3D on PI
  @columns = WIDTH / SCL
  @rows = HEIGHT / SCL
  @terrain = {}
  @mover = 0
end

def draw
  background 0
  @mover -= 0.1
  yoff = mover
  (0..rows).each do |y|
    xoff = 0
    (0..columns).each do |x|
      terrain[[x, y]] = Vec3D.new(x * SCL, y * SCL, map1d(noise(xoff, yoff), 0..1.0, -65..65))
      xoff += 0.2
    end
    yoff += 0.2
  end
  stroke 255
  no_fill
  stroke 235, 69, 129
  translate width / 2, height / 2
  rotate_x PI / 3
  translate(-WIDTH / 2, -HEIGHT / 2)
  (0...rows).each do |y|
    begin_shape(TRIANGLE_STRIP)
    (0..columns).each do |x|
      terrain[[x, y]].to_vertex(renderer)
      terrain[[x, y.succ]].to_vertex(renderer)
    end
    end_shape(CLOSE)
  end
end

def renderer
  @renderer ||= AppRender.new(self)
end

@MoiRouhs someone was complaining about poor performance of terrain.pde sketch on processing forum so I hacked about a bit on your sketch (doesn't work too bad).