ORD : THIN TERRAIN MESH

Hello Martin,

I don't know of a practical way inside ORD to simplify existing mesh but there are things you can do outside. In some existing maps, for example, contours can be drawn as bsplines. Converting them to linestring linetype with custom sensitivity significantly reduces the terrain size in ORD. Actually, I don't understand why bspline contours are solved with so many triangles in ORD. If at least the minimum distance between the mesh points can be determined, we can create a terrain surface that works much easier and faster. In your case there may be a similar unnecessary triangle formation. Can you share a sample screenshot of your Terrain mesh?

Regards

Erdem

Hello Martin,

I don't know of a practical way inside ORD to simplify existing mesh but there are things you can do outside. In some existing maps, for example, contours can be drawn as bsplines. Converting them to linestring linetype with custom sensitivity significantly reduces the terrain size in ORD. Actually, I don't understand why bspline contours are solved with so many triangles in ORD. If at least the minimum distance between the mesh points can be determined, we can create a terrain surface that works much easier and faster. In your case there may be a similar unnecessary triangle formation. Can you share a sample screenshot of your Terrain mesh?

Regards

Erdem

If Using Bspline contours as elevation source, then proper settings are in the configuration file:

Hello Mr. Vincent

 As far as I understand these settings are useful for point dilution but have no effect on bspline lines. When I experimented with different values, I saw that it had no effect. Our existing maps are prepared by our sub-contractors with stereo photogrammetric evaluation. Drawings are created in dgn format with Microstation V8i and the Leica Photogrametric Suite. All contour entities in drawings are generated as bsplines. In our current workflow, we first convert bspline objects to linestrings within the point distance range we want. In this case, as far as we understand, ORD does not have a setting when evaluating bspline objects to create terrain objects.

Best regards,

Erdem

If you want to simplify a terrain mesh, you first need to export it to MX Genio (in .txt)

Then import it back into Openroads, this way you will be able to import it back into Openroads and use the filtering ability that Vincent have talk.  I never did this with a 800mb terrain but have done this before and it works.

Thanks for the extra info!  This is the type of data I'm dealing with 

You are correct, the contour thinning settings applies on linestrings and not Bsplines, 

But these setting does enable control on density of points taken into account, which is the desired result.

You may generate Terrain, check result, change settings, then retriangulate without having to relaunch ORD.

HTH

The test file is attached.B-spline.dgn