diff --git a/main.c b/main.c
index 7a80cab..9d08c01 100644
--- a/main.c
+++ b/main.c
@@ -56,11 +56,9 @@ int main(void) {
 
     int w, h, c;
     unsigned char *terrain_img = stbi_load("terrain.png", &w, &h, &c, 0);
-    w = 100;
-    h = 100;
     int vcount = w * h * 3;
     float *verts = malloc(vcount * sizeof(float));
-    float scale_y = 0.3f;
+    float scale_y = 1.0f;
     float shift_y = 16.0f;
     for (int row = 0; row < h; row++) {
         for (int col = 0; col < w; col++) {
@@ -137,17 +135,18 @@ int main(void) {
                 quit = true;
             } else {
                 char key = e.key.keysym.sym;
+                float speed = 1.1f;
                 if (key == 'w') {
-                    y += 0.01f;
+                    y += speed;
                 }
                 if (key == 's') {
-                    y -= 0.01f;
+                    y -= speed;
                 }
                 if (key == 'a') {
-                    x += 0.01f;
+                    x += speed;
                 }
                 if (key == 'd') {
-                    x -= 0.01f;
+                    x -= speed;
                 }
             }
         }
@@ -156,7 +155,7 @@ int main(void) {
         glm_mat4_identity(model);
         mat4 view;
         glm_mat4_identity(view);
-        glm_translate(model, (vec3){0.0f, x, y});
+        glm_translate(model, (vec3){x, y, 0.0f});
         // glm_translate(model, (vec3){10.0f, -10.0f, 0.0f});
         // glm_rotate(model, now * 0.0000000001f, (vec3){0.0f, 0.0f, 1.0f});
 
diff --git a/shaders/main.frag b/shaders/main.frag
index ac2d868..43e2fe5 100644
--- a/shaders/main.frag
+++ b/shaders/main.frag
@@ -1,7 +1,8 @@
 #version 330 core
-
+in float Height;
 out vec4 FragColor;
 
 void main() {
-    FragColor = vec4(1, 1, 1, 1);
+    float h = (Height + 16)/32.0f;	// shift and scale the height into a grayscale value
+    FragColor = vec4(h, h, h, 1.0);
 }
diff --git a/shaders/main.vert b/shaders/main.vert
index 5a1d8f0..4fce656 100644
--- a/shaders/main.vert
+++ b/shaders/main.vert
@@ -1,10 +1,11 @@
 #version 330 core
 layout (location = 0) in vec3 pos;
-
+out float Height;
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
 void main() {
+    Height = pos.y;
     gl_Position = projection * view * model * vec4(pos, 1.0);
 }