diff --git a/cube.obj b/cube.obj
index 6023c90..6e515c0 100644
--- a/cube.obj
+++ b/cube.obj
@@ -2,14 +2,14 @@
 # www.blender.org
 mtllib cube.mtl
 o Cube_Cube.002
-v -100.000000 -100.000000 100.000000
-v -100.000000 100.000000 100.000000
-v -100.000000 -100.000000 -100.000000
-v -100.000000 100.000000 -100.000000
-v 100.000000 -100.000000 100.000000
-v 100.000000 100.000000 100.000000
-v 100.000000 -100.000000 -100.000000
-v 100.000000 100.000000 -100.000000
+v -50.000000 -50.000000 50.000000
+v -50.000000 50.000000 50.000000
+v -50.000000 -50.000000 -50.000000
+v -50.000000 50.000000 -50.000000
+v 50.000000 -50.000000 50.000000
+v 50.000000 50.000000 50.000000
+v 50.000000 -50.000000 -50.000000
+v 50.000000 50.000000 -50.000000
 vt 0.625000 0.000000
 vt 0.375000 0.250000
 vt 0.375000 0.000000
diff --git a/main.c b/main.c
index 6f00ea7..8cf1181 100644
--- a/main.c
+++ b/main.c
@@ -68,7 +68,7 @@ vec3_matrix3x3_multiply(vec3 v, matrix3x3 r)
 }
 
 camera
-new_camera(double range, vec3 pos, vec3 target, vec3 up)
+new_camera(double znear, vec3 pos, vec3 target, vec3 up)
 {
     if (pos.x == target.x &&
         pos.y == target.y &&
@@ -76,7 +76,7 @@ new_camera(double range, vec3 pos, vec3 target, vec3 up)
         die("cannot create camera with same target and position");
 
     camera ret = {
-        .range  = range,
+        .znear  = znear,
         .pos    = pos,
         .target = target,
         .up     = up,
@@ -505,8 +505,10 @@ midpoint(vec2 a, vec2 b)
 vec2
 project(camera c, vec3 v)
 {
-	double r = 200 / (v.z + c.range);
-	return (vec2){W / 2 + r * v.x, H / 2 + r * v.y};
+    vec3 u = vec3_sub(v, c.pos);
+    // TODO rotation
+	double r = c.znear / u.z;
+	return (vec2){W / 2 + r * u.x, H / 2 + r * u.y};
 }
 
 triangle2
@@ -542,18 +544,44 @@ void
 draw_mesh(rgb canvas[], rgb col, camera c, mesh mesh)
 {
     for (uint32_t i = 0; i < mesh.tri_num; i++) {
-        if (wireframe)
-            draw_triangle(canvas, col, project_triangle(c, (triangle3) {
-                        mesh.vertices[mesh.indices[3*i  ]],
-                        mesh.vertices[mesh.indices[3*i+1]],
-                        mesh.vertices[mesh.indices[3*i+2]],
-                    }));
-        else
-            fill_triangle(canvas, col, project_triangle(c, (triangle3) {
-                        mesh.vertices[mesh.indices[3*i  ]],
-                        mesh.vertices[mesh.indices[3*i+1]],
-                        mesh.vertices[mesh.indices[3*i+2]],
-                    }));
+        vec3 v0 = mesh.vertices[mesh.indices[3*i  ]],
+            v1  = mesh.vertices[mesh.indices[3*i+1]],
+            v2  = mesh.vertices[mesh.indices[3*i+2]];
+
+        vec3 norm = vec3_normalize(vec3_cross(vec3_sub(v1, v0), vec3_sub(v2, v0)));
+        double x = vec3_dot(vec3_sub(v0, c.pos), norm);
+
+        if (wireframe) {
+            if (x < 0)
+                draw_triangle(canvas, col, project_triangle(c, (triangle3) {
+                            v0, v1, v2
+                        }));
+            /* else */
+            /*     draw_triangle(canvas, */
+            /*                   (rgb) { */
+            /*                       .r = col.r * 0.2, */
+            /*                       .g = col.g * 0.2, */
+            /*                       .b = col.b * 0.2, */
+            /*                       .a = col.a */
+            /*                   }, */
+            /*                   project_triangle(c, (triangle3) { */
+            /*                           v0, v1, v2 */
+            /*                       })); */
+        }
+        else {
+            if (x < 0) {
+                double col_mod = clamp(vec3_dot(norm, (vec3){200, 200, 200}) * 0.8, 0.0, 255.0);
+                fill_triangle(canvas,
+                              (rgb) {
+                                  .r = col_mod,
+                                  .g = col_mod,
+                                  .b = col_mod
+                              },
+                              project_triangle(c, (triangle3) {
+                                      v0, v1, v2
+                                  }));
+            }
+        }
     }
 }
 
@@ -623,7 +651,7 @@ int
 main(void)
 {
     sdl_state state = init_sdl();
-    camera cam = new_camera(180, (vec3){0, 0, 3}, (vec3){0, 0, 0}, UP);
+    camera cam = new_camera(180, (vec3){0, 0, 200}, (vec3){0, 0, 0}, UP);
     /* print_camera(cam); */
 
     SDL_Event event;
@@ -633,14 +661,15 @@ main(void)
 
     uint64_t t = 0;
 
+    double rot_speed = 0.5;
     for (;;) {
         double elapsed, start = SDL_GetPerformanceCounter();
 
         matrix3x3 rotation = matrix3x3_multiply(
             matrix3x3_multiply(
-                z_rotation(1.2 * t),
-                y_rotation(1.1 * t)),
-            x_rotation(1.0 * t));
+                z_rotation(1.2 * t * rot_speed),
+                y_rotation(1.1 * t * rot_speed)),
+            x_rotation(1.0 * t * rot_speed));
 
         int x, y;
         uint32_t buttons = SDL_GetMouseState(&x, &y);
diff --git a/types.h b/types.h
index 6e8aa49..690fff8 100644
--- a/types.h
+++ b/types.h
@@ -44,7 +44,7 @@ STRUCT(matrix4x4)
 END_STRUCT
 
 STRUCT(camera)
-    FIELD(range, double)
+    FIELD(znear, double)
     FIELD(pos, vec3)
     FIELD(target, vec3)
     FIELD(up, vec3)
@@ -130,6 +130,12 @@ vec3_cross(vec3 u, vec3 v)
     };
 }
 
+double
+vec3_dot(vec3 u, vec3 v)
+{
+    return u.x * v.x + u.y * v.y + u.z * v.z;
+}
+
 vec3
 vec3_normalize(vec3 u)
 {