--- deliantra/server/common/noise.C	2011/04/30 11:03:46	1.15
+++ deliantra/server/common/noise.C	2011/04/30 19:04:50	1.16
@@ -628,11 +628,16 @@
   return blend (a, b,border, U(0), W);
 }
 
+// highest mountains, deepest sea == 200 .. -200
+
 static void
 gen_height (int x, int y)
 {
   vec2d P = vec2d (x, y);
 
+  const int deep_sea_z = -200;
+  const int mountain_z = 200;
+
   static frac2d gen(13);
 
   static frac2d vec_gen1 (6, 2, 0.5, 1);
@@ -656,55 +661,73 @@
   static frac2d continent_gen (13, 2.13, 0.5);
   float continent = continent_gen.fBm (P_continent) + 0.05f;
 
-  float land_gradient = sigmoid1 (P[0] * (1. / 25000));
+  float x_gradient    = P[0] * (1. / 25000);
+  float y_gradient    = P[1] * (1. / 25000);
+  float xy_gradient   = (P[0] + P[1]) * (0.5 / 25000);
 
-  const float W =  1000       * continent_scale;
   const float N = (25000 - 1) * continent_scale;
 
+  // we clip a large border on the perturbed shape, to get irregular coastline
+  // and then clip a smaller border around the real shape
   continent = border_blend (-1.f, continent, P_continent                        , N, 400 * continent_scale);
   continent = border_blend (-1.f, continent, P * continent_scale + perturb * 0.1, N, 100 * continent_scale);
 
+  enum {
+    T_NONE,
+    T_OCEAN,
+    T_RIVER,
+    T_VALLEY,
+    T_MOUNTAIN,
+  } t = T_NONE;
+
   vec3d c;
-  float v;
+  int z = 1000000;
 
-  if (continent < 0)
-    {
-      // ocean
+  // the continent increases in height from 0 to ~700 levels in the absence of anything else
+  // thats about one step every 7 maps.
+  int base_height  = blend (0, 300, xy_gradient, 0.2f, 0.9f);
+  int river_height = base_height * 9 / 10;
 
-      v = min (continent * 10, -0.2f);
-      c = vec3d (0, 0, 1);
+  // add this to rivers to "dry them out"
+  float dry_out = max (0.f, lerp (xy_gradient, 0.7f, 1.f, 0.f, 0.3f));
+
+  static frac2d river_gen (2);
+  float river1 = abs (river_gen.fBm (P * 0.001 + perturb * 4))                              + dry_out;
+  float river2 = river_gen.ridgedmultifractal (P * 0.04, 0.8, 10) - y_gradient * 0.2 - 0.16 - dry_out;
+
+  float valley = river1 - 0.2f;
+
+  static frac2d mountain_gen (8, 2.14, 0.5);
+  float mountain = mountain_gen.ridgedmultifractal (P * 0.004);
+
+  t = valley < 0 ? T_VALLEY : T_MOUNTAIN;
+  c = blend0 (vec3d (0.8, 0.8, 0), vec3d (0.8, 0, 0), valley, 0.1f);
+  z = blend0 (base_height + continent * 300, base_height + mountain * xy_gradient * 400, valley, 0.1f);
+
+  if (river1 < 0.01f)
+    {
+      // main rivers - they cut deeply into the mountains (base_height * 0.9f)
+      t = T_RIVER;
+      c = vec3d (0.2, 0.2, 1);
+      min_it (z, river_height + lerp<float> (river1, 0.f, 0.01f, -20, -1));
     }
-  else
+
+  if (river2 > 0)
     {
-      // continent
+      t = T_RIVER;
+      c = vec3d (0.2, 0.2, 1);
+      min_it (z, river_height + lerp<float> (river1, 0.f, 0.01f, -5, -1));
+    }
 
-      // big rivers
-      static frac2d river_gen (1);
-      float river1 = abs (river_gen.fBm (P * 0.001 + perturb * 4));
-      float river2 = river_gen.ridgedmultifractal (P * 0.04 + vec2d (3, 5), 0.8, 10) - (P[1] / 25000) * 0.1;
-
-      if (river1 < 0.03f)
-        {
-          v = min (-0.1f, -river1);
-          c = vec3d (0.2, 0.2, 1);
-        }
-      else if (river1 < 0.2f && river2 > 0.1f)
-        {
-          v = -0.05f;
-          c = vec3d (0.4, 0.4, 1);
-        }
-      else
-        {
-          //c = river1 > 0 ? vec3d (0.8, 0.8, 0) : vec3d (0.8, 0, 0);
-          c = blend0 (vec3d (0.8, 0, 0), vec3d (0.8, 0.8, 0), 0.01f, river1);
-
-          static frac2d mountain_gen (8, 2.14, 0.5);
-          float mountain = mountain_gen.ridgedmultifractal (P * 0.004);
-          v = blend0 (mountain * 3 - 1, continent, 0.05f, river1);
-        }
+  if (continent < 0)
+    {
+      t = T_OCEAN;
+      min_it (z, min (continent * 200, -1));
+      c = vec3d (0, 0, 1);
     }
 
-  c *= v * 0.5 + 0.5;
+  float v = clamp (lerp<float> (z, deep_sea_z, mountain_z*0+800, 0.f, 1.f), 0.f, 1.f);
+  c *= v;
 
   putc (clamp<int> (255 * c[0], 0, 255), stdout);
   putc (clamp<int> (255 * c[1], 0, 255), stdout);
@@ -725,7 +748,7 @@
 
       for (int x = 0; x < Nw; ++x) gen_height (x * 25000 / Nw, y * 25000 / Nw);
 
-      for (int x = 0; x < Nw; ++x) gen_height (x, y);
+      for (int x = 0; x < Nw; ++x) gen_height (x +   400, y);
       for (int x = 0; x < Nw; ++x) gen_height (x + 22000, y +  2000);
     }
   for (int y = 0; y < Nw; ++y)
@@ -733,7 +756,7 @@
       if (!(y&63))fprintf (stderr, "y %d\n", y * 50 / Nw+50);//D
 
       for (int x = 0; x < Nw; ++x) gen_height (x +  1000, y + 22000);
-      for (int x = 0; x < Nw; ++x) gen_height (x + 12000, y + 12000);
+      for (int x = 0; x < Nw; ++x) gen_height (x + 12500, y + 12500);
       for (int x = 0; x < Nw; ++x) gen_height (x + 22000, y + 22000);
     }