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From curves to contours — without leaving Rhino.

DOCOgrade is a surface grading plugin for Rhinoceros 3D that brings a structured, curve-driven grading workflow to your Rhino models.

Draw your grade curves, generate a triangulated grading surface, and let DOCOgrade keep your contours, spot grades, and cut & fill volumes in sync as your design evolves. Turn that surface data into clear, print-ready grading documentation — all without leaving Rhino.

Key Features​

  • Graded Curve Generation — Draw grade curves directly in your model to define falls across a site, particularly useful for DDA access and accessible design.

  • Dynamic Surface Annotations — Add contour elevation labels, spot grades, and point-to-point grades that update automatically as your surface design changes.

  • Automatic Surface Generation — Generate a topographic mesh (TIN) directly from your design curve network, combining the reliability of triangulated surfaces with the familiarity of Rhino geometry.

  • Automated Contour Generation — Generate contours in both 2D and 3D, with optional elevation labels kept in sync with the surface.

  • Cut & Fill Analysis — Quickly determine cut and fill volumes to sense-check your design as it develops.

  • Measuring Tools — Measure grades and elevations of objects relative to a surface, or between two points.

  • Analytical Display Modes — Instantly review surface grades for planting, drainage, and accessibility considerations.

  • Customisable Layers & Styles — Map layers and annotation styles to a template file, keeping naming and styling consistent across projects.

Surface grading, without leaving Rhino​

DOCOgrade brings a structured, curve-driven grading workflow to your Rhino models. Grade curves, surfaces, contours, and annotations remain linked and update together, allowing your design data to flow naturally from curve → surface → contour → grade → analysis.

Get the accuracy and rigour of a dedicated civil grading workflow while continuing to design in the Rhino environment you already know.

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We welcome your feedback and suggestions.