Creating an Excavation Surface

The output is a standard V5 feature.

• Dam, representing the dam you want to build across the valley, and its axis (DamAxis)
• LandSurface, representing the top soil layer,
• RockLayer, representing the rock layer underneath the LandSurface,
• MeshIntersection, that is the scan resulting from the intersection of the RockLayer and the Dam.

The excavation surface lets you compute the volume of soil to dig out, delimited by the excavation surface, the LandSurface and the RockLayer.

1. Click Excavation  in the Terrain Modeling toolbar.
   The Excavation dialog box is displayed:
   

2. Select the Scan you want to process.

   This scan is the intersection between: The mesh representing the building for which you want to compute the excavation, The mesh representing the layer on which the building is built, here the rock layer. It is usually a closed scan. In our example MeshIntersection.1.

3. If required, modify the Parameters:

   Height: height of the resulting mesh, Slope: slope of the resulting mesh, defined as follows: Height=10, Slope=1: Height=20, Slope=1: Height=10, Slope=2:

4. According to your needs, select or clear the Axis check box.
   By default, it is selected.

   The axis is the axis of the building for which you are computing the excavation. It must be a curve, not necessarily a straight line. The excavation surface is computed between two guides: The bottom one is defined by the points of the scan selected, The top one is defined by the transformations of the bottom scan points. These transformations are computed through a plane, which is defined as follows: Check box Axis cleared (no axis selected): The plane goes through the scan point, and the normal to this plane is the tangent to the scan for this given point. Check box Axis selected: The plane goes through the scan point, its normal projection on the axis, and the Z-axis of the given point.