topic Re: MultiPatch Triangles in ArcObjects SDK Questions

MultiPatch Triangles

JohnMcGlynn — Thu, 07 Feb 2013 00:43:03 GMT

I have an ArcScene document which was created using an FME translation of an AutoCad 3D drawing. The arrangement of the geometries is awful - there are triangles which touch and are in the same plane but have been placed in different geometries.

I am using Ctype(pFeature.ShapeCopy, IGeometryCollection) to break up the multipatch.

I would like to be able to break the multipatch into it's individual triangles and reassemble them in some kind of logical order. If I break it into it's geometries then most of them contain more than one triangle.

Can anyone tell me how I can break the geometries into their individual triangles?

Thanks,

NavJohn

Re: MultiPatch Triangles

RichWawrzonek — Tue, 12 Feb 2013 19:52:48 GMT

Perhaps this whitepaper will help:

http://www.esri.com/library/whitepapers/pdfs/multipatch-geometry-type.pdf

Re: MultiPatch Triangles

JohnMcGlynn — Thu, 14 Feb 2013 23:44:46 GMT

No, it doesn't unfortunately.

Re: MultiPatch Triangles

SirishByreddy — Thu, 09 Oct 2014 04:30:03 GMT

Hi John,

Did you find any solution. I am also looking for this. I have posted similar kind of question here...and unfortunately no replies from ESRI.

here is my question..

https://community.esri.com/message/420864#420864

Thanks,

Sirish

Re: MultiPatch Triangles

JohnMcGlynn — Sat, 15 Nov 2014 09:05:52 GMT

Hi SIrish,

Sorry for the delay on this.

The point collection of the multipatch can be found by creating a new IPointCollection4 and then looping through the geometries and typing each geometry to the pointcollection.

for (int i = 0; i < multiPatchGeometryCollection.GeometryCount; i++)

{

//here i want to know each geomteries Triangles count and it vertices

pPtColl = new Ring;

pGeom = multiPatchGeometryCollection.Geometry(i);

pPtColl = (IPointCollection4)pGeom;

// Cycle through the points pPtColl

}

Re: MultiPatch Triangles

SirishByreddy — Wed, 20 May 2015 07:02:46 GMT

Hi John,

Sorry for the late reply to this.

Thank you very much. It works.

Thanks

Sirish