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Create Volume Objects / Fill Holes in Triangle Net

Use this dialog to close triangle nets so they form a volume object, or to fill holes in triangle nets even if it is not possible to create a volume object.

Where do I find the dialog?

In the terrain model drawing context menu, select Tools - Create Volume Object / Fill Holes in Triangle Net...

Using the dialog

The function uses two criteria to determine whether a hole should be filled:

  • Maximum perimeter
  • Maximum 3D area

The program first checks the hole's perimeter against the specified criterion. If the perimeter is less than the limit, the next criterion is checked. If the 3D area is also less than the limit, the hole is filled. Both criteria must be met for the hole to be filled.

Note

Two criteria are used because square and rectangular holes can have approximately the same area, but large differences in perimeter.

Example

Settings:

  • Maximum perimeter: 5
  • Maximum 3D area: 2

Example of a hole that is filled

Example of a hole that is not filled

Practical examples

Measured or scanned gravel pile

You can use the function to close the triangle net for a measured or scanned gravel pile. The volume is then calculated, which is shown, among other places, in the horizontal list field for triangle net.

Example of closing a triangle net for volume calculation

Imported construction from CAD

Imported volumes in CAD constructions become triangle nets in Gemini Terrain. In some cases, you may find that these do not become volume objects. If this is because the triangle nets are not 100 % closed, you can use the function to fix this.