diff --git a/main.c b/main.c
index 1f265e7..4548cda 100644
--- a/main.c
+++ b/main.c
@@ -17,12 +17,63 @@
  */
 
 #include "raylib.h"
-#include <math.h>
 #include <stddef.h>
 
 #define MIN(a,b) (((a)<(b))?(a):(b))
 #define MAX(a,b) (((a)>(b))?(a):(b))
-#define CLAMP(val, min, max) MIN(max, MAX(min, val))
+#define CLAMP2(val, min, max) MIN(max, MAX(min, val))
+#define CLAMP(val, min, max) ((val) < (min) ? (min) : ((val) > (max) ? (max) : (val)))
+#define LROT(v,n) ((v << n) | (v >> (sizeof(v)*8 - n)))
+#define RROT(v,n) ((v >> n) | (v << (sizeof(v)*8 - n)))
+
+#define MAP_SIZE 64
+
+struct ModelDirection {
+  Model model;
+  unsigned char pattern;
+};
+
+void generate_river(Color *map_data, int previous) {
+  int x = previous % MAP_SIZE, y = previous / MAP_SIZE;
+  if (x == 0 || x == MAP_SIZE -1 || y == 0 || y == MAP_SIZE -1) return;
+
+  int local_minimum_map_i = previous;
+  int local_minimum_val = 255;
+  int gradients[4][2] = {{0,-1},{-1,0},{0,1},{1,0}};
+  for (int gradient_i = 0; gradient_i < 4; gradient_i++) {
+    int dx = CLAMP(x + gradients[gradient_i][0], 0, MAP_SIZE - 1);
+    int dy = CLAMP(y + gradients[gradient_i][1], 0, MAP_SIZE - 1);
+    int i = dy * MAP_SIZE + dx;
+    if (i == previous || map_data[i].r == 1) continue;
+    if (map_data[i].b < local_minimum_val) {
+      local_minimum_map_i = i; 
+      local_minimum_val = map_data[i].b;
+    }
+  }
+  if (local_minimum_val == 255) return;
+  map_data[local_minimum_map_i].r = 1;
+  generate_river(map_data, local_minimum_map_i);
+}
+
+void select_river_tile(Color *map_data, struct ModelDirection *rivers, int x, int y, size_t *river_i, size_t *direction) {
+
+  int surrounding[8][2] = {{-1,-1},{0,-1},{1,-1},{1,0},{1,1},{0,1},{-1,1},{-1,0}};
+  unsigned char river_tile = 0;
+  for (int surrounding_i = 0; surrounding_i < 8; surrounding_i++) {
+    int dx = CLAMP(x + surrounding[surrounding_i][0], 0, MAP_SIZE - 1);
+    int dy = CLAMP(y + surrounding[surrounding_i][1], 0, MAP_SIZE - 1);
+    if (map_data[dy * MAP_SIZE + dx].r) 
+      river_tile |= 1 << (7 - surrounding_i);
+  } 
+  for (*river_i = 0; *river_i < 11; (*river_i)++) {
+    for (*direction = 0; *direction < 4; (*direction)++) {
+      if ((rivers[*river_i].pattern & RROT(river_tile, 2 * *direction)) == rivers[*river_i].pattern) {
+        return;
+      }
+    }
+  }
+}
+
 
 int main(void) {
   const int screenWidth = 800;
@@ -37,353 +88,92 @@ int main(void) {
   camera.fovy = 45.0f;
   camera.projection = CAMERA_PERSPECTIVE;
 
-  Model models[] = {
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bed_floor.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_center_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_center_stoneRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_center_wood.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_center_woodRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_side_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_side_stoneRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_side_wood.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_side_woodRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_stoneNarrow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_stoneRoundNarrow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_stoneRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_woodNarrow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_wood.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_woodRoundNarrow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/bridge_woodRound.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cactus_short.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cactus_tall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/campfire_bricks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/campfire_logs.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/campfire_planks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/campfire_stones.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/canoe.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/canoe_paddle.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockCave_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockCave_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockDiagonal_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockDiagonal_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockHalf_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockHalf_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockQuarter_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockQuarter_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_block_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlopeHalfWalls_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlopeHalfWalls_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlope_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlope_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlopeWalls_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_blockSlopeWalls_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_block_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cave_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cave_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInnerLarge_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInnerLarge_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInnerTop_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerInnerTop_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerLarge_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerLarge_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_corner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_corner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerTop_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_cornerTop_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_diagonal_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_diagonal_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_halfCornerInner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_halfCornerInner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_halfCorner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_halfCorner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_half_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_half_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_large_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_large_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_stepsCornerInner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_stepsCornerInner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_stepsCorner_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_stepsCorner_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_steps_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_steps_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_topDiagonal_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_topDiagonal_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_top_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_top_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_waterfall_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_waterfall_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_waterfallTop_rock.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_waterfallTop_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crop_carrot.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crop_melon.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crop_pumpkin.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_bambooStageA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_bambooStageB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_cornStageA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_cornStageB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_cornStageC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_cornStageD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtDoubleRowCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtDoubleRowEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtDoubleRow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtRowCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtRowEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtRow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_dirtSingle.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_leafsStageA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_leafsStageB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_wheatStageA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crops_wheatStageB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/crop_turnip.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_bendCenter.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_bend.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_corner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_gate.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_planksDouble.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_planks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simpleCenter.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simpleDiagonalCenter.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simpleDiagonal.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simpleHigh.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simpleLow.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/fence_simple.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_purpleA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_purpleB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_purpleC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_redA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_redB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_redC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_yellowA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_yellowB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/flower_yellowC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/grass_large.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/grass_leafsLarge.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/grass_leafs.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/grass.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_grass.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathBendBank.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathBend.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathCornerSmall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathCross.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathEndClosed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathRocks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathSide.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathSideOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathSplit.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathStraight.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_pathTile.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverBendBank.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverBend.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCornerSmall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCross.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverEndClosed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverRocks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSide.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSideOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSplit.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverStraight.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverTile.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/hanging_moss.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/lily_large.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/lily_small.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/log_large.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/log.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/log_stackLarge.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/log_stack.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_redGroup.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_red.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_redTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_tanGroup.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_tan.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/mushroom_tanTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_stoneCircle.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_stoneCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_stoneEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_woodCorner.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_woodEnd.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/path_wood.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bushDetailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bushLarge.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bushLargeTriangle.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bush.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bushSmall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_bushTriangle.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_flatShort.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/plant_flatTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/platform_beach.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/platform_grass.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/platform_stone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/pot_large.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/pot_small.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_largeF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallFlatA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallFlatB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallFlatC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallG.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallH.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallI.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallTopA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_smallTopB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallG.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallH.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallI.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/rock_tallJ.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/sign.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_block.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_columnDamaged.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_column.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_head.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_obelisk.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/statue_ring.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_largeF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallFlatA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallFlatB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallFlatC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallG.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallH.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallI.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallTopA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_smallTopB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallG.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallH.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallI.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stone_tallJ.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_old.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_oldTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_roundDetailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_round.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_squareDetailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_squareDetailedWide.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/stump_square.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tent_detailedClosed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tent_detailedOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tent_smallClosed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tent_smallOpen.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_blocks_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_blocks_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_blocks.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_cone_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_cone_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_cone.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_default_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_default_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_default.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_detailed_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_detailed_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_detailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_fat_darkh.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_fat_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_fat.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_oak_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_oak_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_oak.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palmBend.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palmDetailedShort.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palmDetailedTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palm.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palmShort.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_palmTall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineDefaultA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineDefaultB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineGroundA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineGroundB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundE.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineRoundF.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineSmallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineSmallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineSmallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineSmallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallA_detailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallA.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallB_detailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallB.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallC_detailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallC.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallD_detailed.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_pineTallD.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_plateau_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_plateau_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_plateau.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_simple_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_simple_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_simple.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_small_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_small_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_small.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_tall_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_tall_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_tall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_thin_dark.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_thin_fall.obj"),
-    LoadModel("assets/kenney_nature-kit/Models/OBJ format/tree_thin.obj"),
+
+  struct ModelDirection rivers[] = {
+    /* 0b12345678
+     * 1 | 2 | 3
+     * 8 |   | 4
+     * 7 | 6 | 5
+     */
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverOpen.obj"),
+      .pattern = 0b11111111
+    },
+    // edge
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCornerSmall.obj"),
+      .pattern = 0b11011111
+    },
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSideOpen.obj"),
+      .pattern = 0b01011111
+    },
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSide.obj"),
+      .pattern = 0b11110001
+    },
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCross.obj"),
+      .pattern = 0b01010101
+    },
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverSplit.obj"),
+      .pattern = 0b01010001
+    },
+    // STRAIGHT
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverStraight.obj"),
+      .pattern = 0b01000100
+    },
+    // corner
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverCorner.obj"),
+      .pattern = 0b11000001
+    },
+    // L SHAPE
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverBend.obj"),
+      .pattern = 0b01000001
+    },
+    // closed
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverEndClosed.obj"),
+      .pattern = 0b01000000
+    },
+    {
+      .model = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_riverTile.obj"),
+      .pattern = 0b00000000
+    },
   };
   
-#define MAP_SIZE 64
+  Model ground = LoadModel("assets/kenney_nature-kit/Models/OBJ format/ground_grass.obj");
+  Model cliff = LoadModel("assets/kenney_nature-kit/Models/OBJ format/cliff_top_rock.obj");
+  
   Vector3 position = {0};
   Image map = GenImagePerlinNoise(MAP_SIZE, MAP_SIZE, 0, 0, 1.f);
   Texture2D map_texture = LoadTextureFromImage(map);
+  Color *map_data = LoadImageColors(map);
+  size_t global_minimum_map_i;
+  size_t global_minimum_val = 255;
 
   for (size_t i = 0; i < MAP_SIZE * MAP_SIZE; i++) {
-    Color c = GetImageColor(map, i % MAP_SIZE, i / MAP_SIZE);
-    ImageDrawPixel(&map, i % MAP_SIZE, i / MAP_SIZE, (Color) {
-      .r = MAX(0, c.r - 64) / 32,
-      .g = MAX(0, c.r - 64) / 32,
-      .b = MAX(0, c.r - 64) / 32,
+    int x = i % MAP_SIZE, y = i / MAP_SIZE;
+    Color c = map_data[i];
+    if (c.r < global_minimum_val) {
+      global_minimum_map_i = i;
+      global_minimum_val = map_data[i].b;
+    }
+    map_data[i] = (Color) {
+      .r = 0,
+      .g = MAX(0, c.g - 64) / 32,
+      .b = c.b,
       .a = 255
-        });
+    };
   }
-  Color *map_data = LoadImageColors(map);
+
+  map_data[global_minimum_map_i].r = 1;
+  generate_river(map_data, global_minimum_map_i);
+  generate_river(map_data, global_minimum_map_i);
 
   // SetTargetFPS(60);
   while (!WindowShouldClose()) {
@@ -394,18 +184,12 @@ int main(void) {
     BeginMode3D(camera);
     for (int i = 0; i < MAP_SIZE * MAP_SIZE; i++) {
       int x = i % MAP_SIZE, y = i / MAP_SIZE;
-      DrawModel(models[128], 
-          (Vector3){
-          .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
-          .y = map_data[i].r - 8, //- (map_gradient_magnitude_data[i].g < 2),
-          .z = MAP_SIZE * (y / (float) MAP_SIZE - 0.5f)
-          } , 1.f, WHITE);
       int gradients[4][2] = {{0,-1},{-1,0},{0,1},{1,0}};
       for (int gradient_i = 0; gradient_i < 4; gradient_i++) {
         int dx = CLAMP(x + gradients[gradient_i][0], 0, MAP_SIZE - 1);
         int dy = CLAMP(y + gradients[gradient_i][1], 0, MAP_SIZE - 1);
-        for (int height = map_data[i].r; height < map_data[dy * MAP_SIZE + dx].r; height++) {
-          DrawModelEx(models[76],
+        for (int height = map_data[i].g; height < map_data[dy * MAP_SIZE + dx].g; height++) {
+          DrawModelEx(cliff,
               (Vector3){
               .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
               .y = height - 8,
@@ -414,6 +198,18 @@ int main(void) {
               (Vector3) {0, 1, 0}, gradient_i * 90.f, (Vector3) {1,1,1}, WHITE);
         }
       }
+      size_t river_i, direction;
+      if (map_data[i].r) {
+        select_river_tile(map_data, rivers, x, y, &river_i, &direction);
+      }
+      DrawModelEx(map_data[i].r ? rivers[river_i].model : ground, 
+          (Vector3){
+          .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
+          .y = map_data[i].g - 8, //- (map_gradient_magnitude_data[i].g < 2),
+          .z = MAP_SIZE * (y / (float) MAP_SIZE - 0.5f)
+          } , (Vector3) {0,1,0}, map_data[i].r ? direction * 90.f: 0, 
+          (Vector3) {1,1,1},
+          WHITE);
     }
     DrawGrid(20, 10.0f);
     EndMode3D();