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Some auxiliary Tcl procedures:
GIS::GetRasterFromTriangles { selected_element_ids cellsize far_points_set_nodata far_points_distance }
It returns a raster from the selected mesh of triangles.selected_element_ids is expected sorted increasing.
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GIS::GetRasterFromNodes { selected_node_ids cellsize far_points_set_nodata far_points_distance }
It returns a raster from the selected mesh nodes. selected_node_ids is expected sorted increasing.
If cellsize is 0.0 an automatic value is used
far_points_set_nodata 0 or 1 (and far_points_distance only used if 1, and can be 0.0 to use an automatic value or a distance>0.0)
GIS::SubsampleRaster { raster increment show_advance_bar }
It returns a new raster subsampling the input raster jumping columns and row by increment
show_advance_bar must be 1 to show and advancing bar during the process
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