Thanks for the quick reply Robert. I intend to look into it as time allows; any 
hint on where to start? I'm not terribly familiar with osgTerrain.

Craig

On Mar 2, 2010, at 11:03 AM, Robert Osfield wrote:

> Hi Craig,
> 
> The normals at task boundaries aren't presently equalised, nor are boundaries 
> between different levels of detail.  With textured models the artefact isn't 
> too noticeable, but with straight geometry it's more pronounced as you have 
> found.
> 
> My plan to address this artifact has been to tackle it in osgTerrain at 
> runtime, adding the automatic adjustment of normals as tiles are loaded.  
> Alas I just haven't yet had the time undertake the work, and don't at present 
> have a slot for it.  Feel free to dive in and add it :-)
> 
> Robert.
> 
> On Tue, Mar 2, 2010 at 4:22 PM, Craig S. Bosma <[email protected]> wrote:
> Hi,
> 
> I've been exploring VPB lately (0.9.11 or thereabouts) and I'm noticing that 
> normals seem to be not quite right at tile boundaries, causing visible 
> 'seams' in the lit terrain (see attached screen capture). Is anyone else 
> aware of this issue, or under what circumstances it appears? My osgdem usage 
> is pretty straightforward -- one SRTM geotiff and no imagery (for this 
> example):
> 
> osgdem --PagedLOD -d dem/srtm_12_05.tif
> 
> Thanks for any insight,
> 
> Craig
> 
> 
> 
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