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Locking a Surface





You can lock the faces (triangles) of a surface so that it's faces don't change. For the purpose of this discussion, faces and triangles are the same.

Faces are Locked

When you lock a surface you force the TIN to use the current faces (triangles) and NOT change them. The surface is therefore no longer allowed to compute the triangles for any reason, be it adding points, turning off breaklines or anything else.

The one exception is that TPC has tools for completely removing survey points and traverses from a survey in which case individual faces will be removed from the locked surface or the entire surface can be removed.

Survey Points are Not Locked

Survey points referenced by the surface are not locked. If the position of a survey point that is referenced by a surface is updated, any faces that refer to the survey point are also updated (their size, shape and orientation will reflect the new positions).

Locking and Unlocking a Surface

Surfaces are locked or unlocked in the Advanced tab of the Surface Settings dialog.

Unlocking a surface that was formerly locked, tells TPC it is allowed to recompute the surface's TIN, thereby creating new faces.

Imported Surfaces are Locked

When a surface is imported from a CAD drawing, TPC locks the surface so that it exactly matches the surface in the CAD drawing. TPC does not currently have tools to edit the individual faces, so the imported surface is considered to be static as opposed to dynamic.

Saving a Locked Surface

TPC stores locked surfaces in a .TRV file by including a file record for each face. As a rule, a face requires 10 bytes + 1 byte per character for each of the three point labels that define the face. Surveys with large surfaces (thousands of points) will take longer to save and load.

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