re-projected rasters have lines where the grid triangles meet

[tonyfang]

Using Studio... - Using Load Procedure: add a raster image, specify the appropriate coordinate system - add the resultant layer to a map - change the map's bg color to something that contrasts with the raster image - change the map's coordinate system to something else (invoking raster re-projection) - preview the map

--> notice there are faint lines where the grid triangles meet

It is AGG’s anti-aliasing that is causing the grid-lines.

When I change the calls from render_scanlines_aa (aa = anti-aliasing) to render_scanlines_bin, the grid lines disappear.

[tonyfang]

 http://trac.osgeo.org/mapguide/changeset/3454