Global Mapper v26.0

Creating terain from vector data, someting goes wrong.

xsherlock
xsherlock Global Mapper User
edited July 2010 in Bug Report
Hi as LOS with Vector obstruction is not yet in :) (thank you for adding it to the todo list).
I was trying to do a work around by creating elevation raster data under the rooftop shp and by this extruding the building from the terrain.

It would go nice but unfortunately GM has diffrent behavior when I do it for every polygon (roof slope) separately and other when I select all of them with the digitizer tool.

The expample roof is made of 5 polys, 4 slope for the main roof and one level for a porch.
If I triangulate them one by one they are fine, but if I select all of them the resulted raster layer is distorted as on the.

Why is that? is that a bug? (I'm not selecting any of the checkboexes in the Create Tereain from area features, except of the .1m resolution that is desired.)

Comments

  • global_mapper
    global_mapper Administrator
    edited July 2010
    I think what is happening when you select all of the polygons as they are all being considered at once, rather than individually, so if you have shared vertices (in XY location) between adjacent areas, only one of them will be considered in the triangulation, so you will get some kind of slope between the adjacent areas.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • xsherlock
    xsherlock Global Mapper User
    edited July 2010
    Yes, I do agree with what you diagnosed, still i'm looking for a solution. Is there a way to force GM to treat every polygon individually and render this terrain properly. Selecting 4.4 million shapes one by one is not an option for me. You could add as check box for that in the dialog.


    Maciej
  • global_mapper
    global_mapper Administrator
    edited July 2010
    Maciej,

    I will take a look at improving the situation with adjoining areas (perhaps by separately triangulating and gridding them) to improve this issue. One option that might work now is to select all of the areas with the Digitizer Tool and right-click then select the rotate/scale option and apply a very small shrink scale (like 0.99) so that the vertices won't overlap anymore. Then you shouldn't have the issue with multiple vertices at the exact same location causing ambiguity.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com

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