Hi Edgar,
Yup, that will definitely cause a difference. I submitted a change to
osgTerrain yesterday that takes care of that issue. Have you had a
chance to look at those changes yet Robert?
Thanks,
Jason
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Edgar Ellis
Sent: Tuesday, May 23, 2006 4:22 P
To: osg users
Subject: Re: [osg-users] osgTerrain elevation accuracy
I tried your changes, but I'm still getting problems as well.
However I did manage to get much better results using a power of 2 + 1
sized dem and a 65x65 tile size.
One idea why the paged database might be slightly off:
Suppose you have a tile whose extents cover from .5 to 8.5px of a dem.
When readHeightField is called for that tile, the tile will be created
from the 0-9px of the dem.
So now your tile represents 9px instead of 8px it's extents indicate.
Is that enough to cause a noticeable difference?
Thanks,
- Edgar
Jason Beverage wrote:
Hi Edgar,
I did a quick substitution of all bounding box code in the DataSet
class with a 2D double bounding box called GeospatialExtents as Robert
suggested. I've tried it on a few datasets here and things have worked
fine so far, but the issue I'm having with scene graph heights being off
by quite a large amount from the source data is still present.
I added a bool, interpolateTerrain in readHeightField that takes an
alternate code path to attempt to prevent upsampling of the terrain by
GDAL, but my problem still exists.
I figured since I'd made these changes I'd send it out to you to see
if it fixed whatever problems you've been having with the float bounding
boxes.
Thanks,
Jason
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jason
Beverage
Sent: Tuesday, May 09, 2006 9:10 A
To: osg users
Subject: RE: [osg-users] osgTerrain elevation accuracy
I'll try to do this today. I've written some code to do bilinear
interpolation on the source terrain data, but it is still off. Maybe
a
combination of it and the double bounding box will solve the issues
I'm
having.
Thanks for your help,
Jason
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert
Osfield
Sent: Tuesday, May 09, 2006 4:31 A
To: osg users
Subject: Re: [osg-users] osgTerrain elevation accuracy
On 5/8/06, Edgar Ellis <[EMAIL PROTECTED]> wrote:
I haven't had a chance deal with the bounding box precision, but as
Robert said using doubles should solve the problem (perhaps a
BoundingBoxd?)
A local double XY box would be more appropriate as it only uses the XY
dimensions of the osg::BoundingBox.
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