Contour lines extracted from 2D height grids using the marching squares algorithm, rendered as colored tube segments projected at a configurable Y plane. Level count, tube radius, and color scale are all configurable. Commonly used alongside surface charts to show elevation or field iso-lines.

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  "title": {
    "text": "3D Contour — Sinusoidal"
  }
}

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Iso-lines from a sin·cos grid projected onto a horizontal plane.

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