X-Git-Url: http://pileus.org/git/?p=grits;a=blobdiff_plain;f=src%2Fgis-opengl.c;h=ad0b5f4a2cabb56a13745356a3c2b56c648d689a;hp=08babe50b8617e77365cf45df64e91d5a42160b5;hb=b87064909e6d20e1ee2995adae0c1ce5cb692d7e;hpb=7d7d6ae0531a85361ce0d8b997d988b653282847

diff --git a/src/gis-opengl.c b/src/gis-opengl.c
index 08babe5..ad0b5f4 100644
--- a/src/gis-opengl.c
+++ b/src/gis-opengl.c
@@ -36,11 +36,12 @@
 #include "objects/gis-marker.h"
 #include "objects/gis-callback.h"
 
-#define FOV_DIST   2000.0
-#define MPPX(dist) (4*dist/FOV_DIST)
-
 // #define ROAM_DEBUG
 
+/* Tessellation, "finding intersecting triangles" */
+/* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
+/* http://www.opengl.org/wiki/Alpha_Blending */
+
 /***********
  * Helpers *
  ***********/
@@ -198,7 +199,7 @@ static void _draw_tiles(GisOpenGL *opengl, GisTile *tile)
 
 static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
 {
-	GisPoint *point = gis_object_center(GIS_OBJECT(marker));
+	GisPoint *point = gis_object_center(marker);
 	gdouble px, py, pz;
 	gis_viewer_project(GIS_VIEWER(opengl),
 			point->lat, point->lon, point->elev,