Re: [OSGeo-Discuss] TIN file formats
On Wednesday, 12 February 2020 06.35.27 EST Martin Dobias wrote: > Unfortunately there is no mailing list yet - but feel free to open new > issue(s) at the github repo and we can discuss there: > https://github.com/lutraconsulting/MDAL/issues That isn't right either. I'm not reporting a bug or asking for a feature; I'm asking for help understanding the code so that I can add a feature. Pierre -- La sal en el mar es más que en la sangre. Le sel dans la mer est plus que dans le sang. ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
Hi Pierre On Wed, Feb 12, 2020 at 12:07 PM Pierre Abbat wrote: > > On Monday, 10 February 2020 04.29.37 EST Martin Dobias wrote: > > MDAL stores TIN as a vector of vertices (XYZ) and a vector of faces > > (where each face is a vector of indices of vertices). There is no > > topological representation like half-edge data structure as this has > > not been needed so far (the library so far has been mostly used for > > rendering, deriving datasets and conversion between formats). MDAL now > > supports vertex and face iterators, so drivers can use whatever > > representation they want (including not keeping the mesh in memory at > > all) as long as they can provide those iterators. > > Looks like I need more help than belongs on the discuss list. Is there a > mailing list for MDAL? Unfortunately there is no mailing list yet - but feel free to open new issue(s) at the github repo and we can discuss there: https://github.com/lutraconsulting/MDAL/issues Regards Martin ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
On Monday, 10 February 2020 04.29.37 EST Martin Dobias wrote: > MDAL stores TIN as a vector of vertices (XYZ) and a vector of faces > (where each face is a vector of indices of vertices). There is no > topological representation like half-edge data structure as this has > not been needed so far (the library so far has been mostly used for > rendering, deriving datasets and conversion between formats). MDAL now > supports vertex and face iterators, so drivers can use whatever > representation they want (including not keeping the mesh in memory at > all) as long as they can provide those iterators. Looks like I need more help than belongs on the discuss list. Is there a mailing list for MDAL? Bezitopo and PerfectTIN, from which I'll be porting the TIN read/write routines, use a sort of winged-edge data structure. But the points, edges, and triangles are held in STL maps, which have to be in memory. Pierre -- When a barnacle settles down, its brain disintegrates. Já não percebe nada, já não percebe nada. ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
Hi Pierre On Sun, Feb 9, 2020 at 8:17 PM Pierre Abbat wrote: > > Again: how does MDAL represent TINs internally? I looked at the code and got > lost. MDAL stores TIN as a vector of vertices (XYZ) and a vector of faces (where each face is a vector of indices of vertices). There is no topological representation like half-edge data structure as this has not been needed so far (the library so far has been mostly used for rendering, deriving datasets and conversion between formats). MDAL now supports vertex and face iterators, so drivers can use whatever representation they want (including not keeping the mesh in memory at all) as long as they can provide those iterators. Regards Martin ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
On Saturday, 7 December 2019 03.21.17 EST Saber Razmjooei wrote: > Hi Pierre, > Very interesting! We are trying to create a generic TIN reader/writer for > open source applications: > https://github.com/lutraconsulting/MDAL/ > > MDAL already supports a number of TIN/mesh formats and it is integrated > with QGIS. > > It would be good to join efforts. Again: how does MDAL represent TINs internally? I looked at the code and got lost. Pierre -- Don't buy a French car in Holland. It may be a citroen. ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
On Thursday, 12 December 2019 09.45.46 EST Saber Razmjooei wrote: > Hi Pierre, > > Apologies for the late response. > > The link was updated. If your TIN is small, you can use MDAL to read it. An > example of such data (ESRI ADF TIN) can be found here: > https://github.com/lutraconsulting/MDAL/blob/master/mdal/frmts/mdal_esri_tin > .cpp > > With MDAL/QGIS, you can also display vectoral data (e.g. slope direction in > http://files.carlsonsw.com/mirror/manuals/Carlson_2014/source/Site_Road_Desi > gn/Surface/Triangulate_amp_Contour/08tri_contour9.PNG ). How does MDAL represent TINs internally? I have not heard any more about the Carlson TIN header. The other surveyor said he would contact the programmer at Carlson, but I don't know if he has. Pierre -- li ze te'a ci vu'u ci bi'e te'a mu du li ci su'i ze te'a mu bi'e vu'u ci ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
Hi Pierre, Apologies for the late response. The link was updated. If your TIN is small, you can use MDAL to read it. An example of such data (ESRI ADF TIN) can be found here: https://github.com/lutraconsulting/MDAL/blob/master/mdal/frmts/mdal_esri_tin.cpp With MDAL/QGIS, you can also display vectoral data (e.g. slope direction in http://files.carlsonsw.com/mirror/manuals/Carlson_2014/source/Site_Road_Design/Surface/Triangulate_amp_Contour/08tri_contour9.PNG ). Hope this helps. Kind regards Saber For On Sun, 8 Dec 2019 at 03:50, Pierre Abbat wrote: > On Saturday, 7 December 2019 03.21.17 EST Saber Razmjooei wrote: > > Hi Pierre, > > Very interesting! We are trying to create a generic TIN reader/writer for > > open source applications: > > https://github.com/lutraconsulting/MDAL/ > > > > MDAL already supports a number of TIN/mesh formats and it is integrated > > with QGIS. > > > > It would be good to join efforts. > > How does MDAL represent TINs internally? > > Where is the QGIS coding style? The link on that page goes to a 404 page. > > I may try to find out what the Carlson TIN header means. I'm talking to > another surveyor tomorrow, who has tried to get the spec, but since I last > talked with him about it, I met some people (not programmers) from > Carlson, > generated a TIN from a point cloud as they watched, exported it as > Carlson, > and handed it to them on a flash drive. > > Pierre > > -- > li ze te'a ci vu'u ci bi'e te'a mu du > li ci su'i ze te'a mu bi'e vu'u ci > > > > ___ > Discuss mailing list > Discuss@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/discuss -- Saber Razmjooei www.lutraconsulting.co.uk +44 (0)7568 129733 ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
On Saturday, 7 December 2019 03.21.17 EST Saber Razmjooei wrote: > Hi Pierre, > Very interesting! We are trying to create a generic TIN reader/writer for > open source applications: > https://github.com/lutraconsulting/MDAL/ > > MDAL already supports a number of TIN/mesh formats and it is integrated > with QGIS. > > It would be good to join efforts. How does MDAL represent TINs internally? Where is the QGIS coding style? The link on that page goes to a 404 page. I may try to find out what the Carlson TIN header means. I'm talking to another surveyor tomorrow, who has tried to get the spec, but since I last talked with him about it, I met some people (not programmers) from Carlson, generated a TIN from a point cloud as they watched, exported it as Carlson, and handed it to them on a flash drive. Pierre -- li ze te'a ci vu'u ci bi'e te'a mu du li ci su'i ze te'a mu bi'e vu'u ci ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] TIN file formats
Hi Pierre, Very interesting! We are trying to create a generic TIN reader/writer for open source applications: https://github.com/lutraconsulting/MDAL/ MDAL already supports a number of TIN/mesh formats and it is integrated with QGIS. It would be good to join efforts. Kind regards, Saber On Fri, 6 Dec 2019, 21:11 Pierre Abbat, wrote: > PerfectTIN can export a TIN in several formats: DXF (text or binary), > Carlson > TIN (reverse engineered, the spec is not public and I don't understand the > header), LandXML, and a plain-text format which I found at https:// > www.xmswiki.com/wiki/TIN_Files . This last one is used by a program > called > AquaVeo. Does any other program use it? What's it called? Are there any > other > formats that I should write code to read or write? > > Pierre > -- > li fi'u vu'u fi'u fi'u du li pa > > > > ___ > Discuss mailing list > Discuss@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/discuss ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
[OSGeo-Discuss] TIN file formats
PerfectTIN can export a TIN in several formats: DXF (text or binary), Carlson TIN (reverse engineered, the spec is not public and I don't understand the header), LandXML, and a plain-text format which I found at https:// www.xmswiki.com/wiki/TIN_Files . This last one is used by a program called AquaVeo. Does any other program use it? What's it called? Are there any other formats that I should write code to read or write? Pierre -- li fi'u vu'u fi'u fi'u du li pa ___ Discuss mailing list Discuss@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/discuss
