Surface Measurement Calculations

When editing or reviewing a roof surface, the software automatically calculates edge lengths corrected for the true pitched surface, not just the flat plan view.

How It Works

1. Base Edge (Gutter Reference)

   • The first drawn edge is treated as the base edge.

   • Its bearing defines the reference direction for all other edges.

2. Pitch Adjustment

   • A pitch angle (roof tilt) can be set per surface.

   • Edge lengths are corrected so that they reflect the actual length along the roof plane.

3. Formula Used

   For an edge at angle Δ to the base edge, with pitch θ:

• Δ = angular difference to base edge

• θ = pitch angle

• Edges parallel to base remain unchanged.

• Edges at an angle are corrected for the slope.
   

4. Labels

   • Length labels are shown at the midpoint of edges.

   • Updates happen in real time while dragging vertices.

   • Duplicate labels along shared edges are automatically avoided.