On Sat, 2009-08-08 at 22:39 -0600, Ron Jensen wrote:
> I noticed long ago that only 1/2 of dirt and grass runways were
> "textured". The untextured part was an appropriate color so I didn't
> worry too much about it.
>
> Yesterday papillon81 brought the issue up on IRC because he'd like to
> improve the texture. Looking at the code and using simgear's
> decode_binobj to dump an airport I found that:
>
> Dirt and grass runways are generated by GenAirports/rwy_simple.cxx.
> The runways are divided into two halves, "A" and "B" each consisting
> of
> two triangles.
> Runway half "A" is good.
> Runway half "B"'s first triangle UV coordinates are a very short line,
> and its second triangle's UV coordinates are a point.
>
> This patch fixes the issue, but I suspect the original intent was to
> mirror the texture around the center-line to hide any seams and this
> patch doesn't do that...
>
>
> Thanks,
>
> Ron
O.K., this patch does the Right Thing. It simply changes the reference
point so the UV coords for the B runway are positive. They were coming
out negative and getting clipped in build.cxx.
Thanks,
Ron.
diff --git a/src/Airports/GenAirports/rwy_simple.cxx
b/src/Airports/GenAirports/rwy_simple.cxx
index 99eb321..8f91334 100644
--- a/src/Airports/GenAirports/rwy_simple.cxx
+++ b/src/Airports/GenAirports/rwy_simple.cxx
@@ -98,7 +98,7 @@ void gen_simple_rwy( const TGRunway& rwy_info,
rwy_polys->push_back( sp );
SG_LOG(SG_GENERAL, SG_DEBUG, "clipped_b = " << clipped_b.contours());
*accum = tgPolygonUnion( runway_b, *accum );
- tp = TGTexParams( runway_b.get_pt(0,0),
+ tp = TGTexParams( runway_b.get_pt(0,2),
rwy_info.width * SG_FEET_TO_METER,
rwy_info.length * SG_FEET_TO_METER / 2.0,
rwy_info.heading + 180.0 );
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