Mesh point add elevation (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#58877
Author: @JanCaha
QGIS version: 3.40

Mesh point add elevation

PR Description:

Description

This PR make some changes when adding new vertices to the MeshLayer.

• newly added vertexes are selected for easier assignment of Z value through the ZValuesWidget
• a button that assigns Z value from QGIS project's QgsAbstractTerrainProvider to currently selected vertices
• a checkbox that allows newly added vertices to automatically get Z value from QGIS project's QgsAbstractTerrainProvider, when the point is created

The placement of the new button and checkbox is up for discussion, so far it is added into ZValuesWidget for convenience

Commits tagged with [need-docs] or [FEATURE]

[JanCaha]

The Final form of the features changed significantly during the PR lifetime.

The "Digitize Mesh Element" tool has added menu, that allows method selection for assignment of Z values to newly created vertices.
This allows to select from 4 options:

• Prefer Mesh, then Z Widget (interpolates z value from mesh, if vertex is inside face of mesh, uses Z widget value otherwise)
• Prefer Mesh, then Terrain (interpolates z value from mesh, if vertex is inside face of mesh, uses terrain value otherwise)
• Project Terrain (always uses project terrain Z value)
• Z Widget (always get Z values from widget)

"Transform Mesh Vertices" panel as a new button added, that allow setting of Z value for selected vertices from project terrain.