Oops, I originally had ramped the vasi/papi color transition the wrong way.

So as you passed through the target glide slope from low to high it would
be colored: red -> white -> small range of transition to red -> white.
Now it goes the right way so you get: red -> smooth transition to -> white.
You can tell you are getting high if you see the bottom vasi start to turn
pink ... etc. etc. hopefully just like in real life.

diff --git a/simgear/scene/tgdb/vasi.hxx b/simgear/scene/tgdb/vasi.hxx
index f36271a98ee25683a13b316749ad357b531dbbc2..d86162d88b8876434eeea869b2b9ee6b8878575b 100644 (file)
--- a/simgear/scene/tgdb/vasi.hxx
+++ b/simgear/scene/tgdb/vasi.hxx
@@ -82,7 +82,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }
@@ -97,7 +97,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }
@@ -112,7 +112,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }
@@ -127,7 +127,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }
@@ -142,7 +142,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }
@@ -157,7 +157,7 @@ public:
             if ( angle_deg < ref - trans ) {
                 color = 0.0;
             } else if ( angle_deg < ref + trans ) {
-                color = (ref + trans - angle_deg) * (1 / (2 * trans) );
+                color = 1.0 - (ref + trans - angle_deg) * (1 / (2 * trans) );
             } else {
                 color = 1.0;
             }