On 1/20/2014 3:56 PM, Even Rouault wrote:
Le lundi 20 janvier 2014 21:48:12, xavier lhomme a écrit :
3D engine doesn't like hole in a polygone.
A way to render such polygon is to link the outer ring and the inner ring.
(But it's better to use tesselation.)
Ah right tesselation would do it.
for example if you have a rectangle ABCD and a triangle describing the hole
( EFG) , you can create a polygone ABCDAEFGA
Actually, I think this would be ABCDAEFGEA and that assumes the the edge
AE does not intersect any other boundary.
Yes, but such description isn't compliant with OGC geometries.
Right, but there was a lot of software around that used this convention
prior to OGC that people still have to deal with. If this is important
enough, I suspect that it would be possible to create an format driver
that could convert between this and OGC formats, Or to write a script
that could convert these to the format needed.
-Steve
It's how I understand the question. I don't think you will find such
function in GEOS (or JTS)
2014/1/20 Even Rouault <[email protected]>
Le lundi 20 janvier 2014 21:27:18, agerrius a écrit :
Hi all,
Does OGR have any build in functionality to convert features with holes
into features without holes? I don't mean delete the inner rings, but
change the geometry so that it covers the same area with only the outer
ring.
I'm afraid not to understand what you mean. What is the difference
between deleting inner rings and "changing the geometry so that it
covers the same area with only the outer ring" ?
There's no one-line invocation for such functionnality. But it can be
done with the OGR API and a few dozains lines of code.
I know GlobalMapper has such a function, but it would be useful if I
could
perform it in my code directly with the OGR library.
Thanks,
Arno
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