Castor

Castor is a free topography toolkit for Grasshopper in Rhino 8.

Castor enables interactive site design by providing tools for analyzing topography and drainage, paired with grading tools that support Nature-based design. Analysis results can be updated to reflect proposed conditions, providing real-time feedback on landscape performance for different design scenarios.

Current features (v1.2.2) include:

• Hydrology Analysis
  • Drainage Network (grid mesh)
  • MFD Drainage Network
  • TIN Drainage Network
  • Ridge Network (Catchment Delineation)
• Topography Analysis
  • Geomorphons (Landform Classification)
  • Viewshed from Point
  • Viewshed Access (viewshed at all points)
  • Relative Elevation Difference (Topographic Position)
  • Relative Elevation Range (Terrain Roughness)
  • Slope
• Topography Toolkit
  • Import GeoTIFF (improved v.1.2.1)
  • Generate Grid Mesh
  • Generate Mesh from Curves
  • Generate Mesh Contours
  • Display Mesh
• Grading Toolkit
  • Curve Relative to Mesh
  • Constrained Curve Relative to Mesh
  • Edit Mesh with Curves
  • Generate Composite Mesh
  • Grade Curves with Control Points
  • Curve Relative to Curves