[postgis-devel] possible Bug in PG 2.1 ( ST_AsX3d() on TIN) ?

[Till Adams]

Hi,

we want to create a X3d file from a point cloud. Therefore we create a 
TIN (you may get this from here:
http://www.webmapcenter.de/downloads/ewkt.tin.zip)

The output was created by ST_ASEWKT, which works fine!

My environment:
POSTGIS="2.1.0 r11822" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 
March 2012" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.8.0" 
LIBJSON="UNKNOWN" RASTER


What we did: Created a geometry collection from a point cloud (approx 
120k values), then used the ST_DelaunayTriangles function. Afterwards we 
wanted to get out this as a x3d-file. When we do this on the same data 
and limit the no. of used points to 50k everything works fine).

When doing this on the whole data, we get this error:
( st_asx3d([data from zip-file above]) )

ERROR:  invalid memory alloc request size 2783188712

(psql-output)

We isolated the TIN into a single table, when asking

SELECT ST_GeometryType(geom) FROM [table];

Postgres throws this:

ERROR:  Unknown geometry type: 15 - Tin

We think, that there might be an error in the memory allocation (geos?), 
because, if memory is limited, the function should swap?


Any hints are highly appreciated!


Regards, Till