diff --git a/src/map.cpp b/src/map.cpp
index 432e9fd5..bc70633c 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -15,6 +15,7 @@
 #include <cstdio>
 #include <cstring>
 #include <cstdlib>
+#include <cmath>
 #include <ctype.h>
 
 #include "core.h"
@@ -126,7 +127,8 @@ Map::Map(char const *path)
         else if (sscanf(tmp, " <image source=\"%[^\"]\"", str) == 1)
         {
             /* This is a tileset image file. Associate it with firstgid. */
-            data->tilers[data->ntilers] = Tiler::Register(str, 32, 32);
+            data->tilers[data->ntilers] = Tiler::Register(str, 32, 32,
+                                                          sqrtf(2));
             data->ntilers++;
             //fprintf(stderr, "new tiler %s\n", str);
         }
diff --git a/src/scene.cpp b/src/scene.cpp
index 15e90dac..37a00a17 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -53,17 +53,19 @@ private:
 
     Tile *tiles;
     int ntiles;
+    float angle;
 };
 
 /*
  * Public Scene class
  */
 
-Scene::Scene()
+Scene::Scene(float angle)
 {
     data = new SceneData();
     data->tiles = 0;
     data->ntiles = 0;
+    data->angle = angle;
 }
 
 Scene::~Scene()
@@ -104,7 +106,7 @@ void Scene::Render() // XXX: rename to Blit()
     static float f = 0.0f;
     f += 0.05f;
     glTranslatef(320.0f, 240.0f, 0.0f);
-    glRotatef(-45.0f, 1.0f, 0.0f, 0.0f);
+    glRotatef(-data->angle, 1.0f, 0.0f, 0.0f);
 #if 0
     glRotatef(3.0f * sinf(f), 1.0f, 0.0f, 0.0f);
     glRotatef(8.0f * cosf(f), 0.0f, 0.0f, 1.0f);
diff --git a/src/scene.h b/src/scene.h
index 0226143a..ca3517c4 100644
--- a/src/scene.h
+++ b/src/scene.h
@@ -23,7 +23,7 @@ class SceneData;
 class Scene
 {
 public:
-    Scene();
+    Scene(float angle);
     ~Scene();
 
     void AddTile(uint32_t code, int x, int y, int z, int o);
diff --git a/src/tiler.cpp b/src/tiler.cpp
index 877745fd..6be5832a 100644
--- a/src/tiler.cpp
+++ b/src/tiler.cpp
@@ -33,13 +33,13 @@ static TilerData * const data = &tilerdata;
  * Public Tiler class
  */
 
-int Tiler::Register(char const *path, int w, int h)
+int Tiler::Register(char const *path, int w, int h, float dilate)
 {
     int id = data->tilesets.MakeSlot(path);
 
     if (!data->tilesets.GetEntity(id))
     {
-        TileSet *tileset = new TileSet(path, w, h);
+        TileSet *tileset = new TileSet(path, w, h, dilate);
         data->tilesets.SetEntity(id, tileset);
     }
 
diff --git a/src/tiler.h b/src/tiler.h
index a4e061ef..8467ddd5 100644
--- a/src/tiler.h
+++ b/src/tiler.h
@@ -22,7 +22,7 @@
 class Tiler
 {
 public:
-    static int Register(char const *path, int w, int h);
+    static int Register(char const *path, int w, int h, float dilate);
     static void Deregister(int id);
 
     static void BlitTile(uint32_t code, int x, int y, int z, int o);
diff --git a/src/tileset.cpp b/src/tileset.cpp
index be9a2f3e..4a123a45 100644
--- a/src/tileset.cpp
+++ b/src/tileset.cpp
@@ -43,7 +43,7 @@ private:
     char *name;
     int *tiles;
     int w, h, nw, nh, ntiles;
-    float tx, ty;
+    float dilate, tx, ty;
 
     SDL_Surface *img;
     GLuint texture;
@@ -53,7 +53,7 @@ private:
  * Public TileSet class
  */
 
-TileSet::TileSet(char const *path, int w, int h)
+TileSet::TileSet(char const *path, int w, int h, float dilate)
 {
     data = new TileSetData();
     data->name = strdup(path);
@@ -78,6 +78,7 @@ TileSet::TileSet(char const *path, int w, int h)
 
     data->w = w;
     data->h = h;
+    data->dilate = dilate;
     /* FIXME: check for non-zero here */
     data->nw = data->img->w / w;
     data->nh = data->img->h / h;
@@ -134,8 +135,8 @@ void TileSet::BlitTile(uint32_t id, int x, int y, int z, int o)
 {
     float tx = data->tx * ((id & 0xffff) % data->nw);
     float ty = data->ty * ((id & 0xffff) / data->nw);
+    float dilate = data->dilate;
 
-    float sqrt2 = sqrtf(2.0f);
     int off = o ? data->h : 0;
     int dx = data->w;
     int dy = data->h * 38 / 32; /* Magic... fix this one day */
@@ -146,13 +147,13 @@ void TileSet::BlitTile(uint32_t id, int x, int y, int z, int o)
         glBindTexture(GL_TEXTURE_2D, data->texture);
         glBegin(GL_QUADS);
             glTexCoord2f(tx, ty);
-            glVertex3f(x, sqrt2 * (y - dy - off), sqrt2 * (z + off));
+            glVertex3f(x, dilate * (y - dy - off), dilate * (z + off));
             glTexCoord2f(tx + data->tx, ty);
-            glVertex3f(x + dx, sqrt2 * (y - dy - off), sqrt2 * (z + off));
+            glVertex3f(x + dx, dilate * (y - dy - off), dilate * (z + off));
             glTexCoord2f(tx + data->tx, ty + data->ty);
-            glVertex3f(x + dx, sqrt2 * (y - dy2), sqrt2 * z);
+            glVertex3f(x + dx, dilate * (y - dy2), dilate * z);
             glTexCoord2f(tx, ty + data->ty);
-            glVertex3f(x, sqrt2 * (y - dy2), sqrt2 * z);
+            glVertex3f(x, dilate * (y - dy2), dilate * z);
         glEnd();
     }
 }
diff --git a/src/tileset.h b/src/tileset.h
index a050da38..0103dfb1 100644
--- a/src/tileset.h
+++ b/src/tileset.h
@@ -28,7 +28,7 @@ class TileSetData;
 class TileSet : public Entity
 {
 public:
-    TileSet(char const *path, int w, int h);
+    TileSet(char const *path, int w, int h, float dilate);
     virtual ~TileSet();
 
 protected: