diff --git a/tiny_bvh_fenster.cpp b/tiny_bvh_fenster.cpp
index 8433ca1..449c58a 100644
--- a/tiny_bvh_fenster.cpp
+++ b/tiny_bvh_fenster.cpp
@@ -3,6 +3,9 @@
 #define SCRHEIGHT 600
 #include "external/fenster.h" // https://github.com/zserge/fenster
 
+//#define COLOR_PRIM // compute color as hashed triangle Index
+//#define COLOR_DEPTH // compute color as depth of intersection 
+
 #define LOADSCENE
 
 #define TINYBVH_IMPLEMENTATION
@@ -14,7 +17,11 @@ using namespace tinybvh;
 BVH bvh;
 int frameIdx = 0;
 Ray* rays = 0;
+#ifdef COLOR_DEPTH
 int* depths = 0;
+#endif
+
+
 
 #ifdef LOADSCENE
 bvhvec4* vertices = 0;
@@ -106,6 +113,12 @@ void Init()
 	else
 		bvh.BuildHQ( vertices, verts / 3 );
 
+	// allocate buffers
+	rays = (Ray*)tinybvh::malloc64(SCRWIDTH * SCRHEIGHT * 16 * sizeof(Ray));
+#ifdef COLOR_DEPTH
+	depths = (int*)tinybvh::malloc64(SCRWIDTH * SCRHEIGHT * sizeof(int));
+#endif
+
 	// load camera position / direction from file
 	std::fstream t = std::fstream{ "camera.bin", t.binary | t.in };
 	if (!t.is_open()) return;
@@ -113,10 +126,6 @@ void Init()
 	t.read( (char*)&eye, sizeof( eye ) );
 	t.read( (char*)&view, sizeof( view ) );
 	t.close();
-
-	// allocate buffers
-	rays = (Ray*)tinybvh::malloc64( SCRWIDTH * SCRHEIGHT * 16 * sizeof( Ray ) );
-	depths = (int*)tinybvh::malloc64( SCRWIDTH * SCRHEIGHT * sizeof( int ) );
 }
 
 bool UpdateCamera( float delta_time_s, fenster& f )
@@ -170,8 +179,13 @@ void Tick( float delta_time_s, fenster& f, uint32_t* buf )
 	}
 
 	// trace primary rays
-	for (int i = 0; i < N; i++) depths[i] = bvh.Intersect( rays[i] );
-
+	for (int i = 0; i < N; i++) {
+#ifdef COLOR_DEPTH
+		depths[i] = bvh.Intersect(rays[i]);
+#else 
+		bvh.Intersect(rays[i]);
+#endif
+	}
 	// visualize result
 	const bvhvec3 L = tinybvh_normalize( bvhvec3( 1, 2, 3 ) );
 	for (int i = 0, ty = 0; ty < SCRHEIGHT / 4; ty++) for (int tx = 0; tx < SCRWIDTH / 4; tx++)
@@ -179,18 +193,29 @@ void Tick( float delta_time_s, fenster& f, uint32_t* buf )
 		for (int y = 0; y < 4; y++) for (int x = 0; x < 4; x++, i++) if (rays[i].hit.t < 10000)
 		{
 			int pixel_x = tx * 4 + x, pixel_y = ty * 4 + y, primIdx = rays[i].hit.prim;
+			
+
+#ifdef COLOR_DEPTH
+			buf[pixel_x + pixel_y * SCRWIDTH] = depths[i] << 17; // render depth as red
+#elif defined COLOR_PRIM
+			buf[pixel_x + pixel_y * SCRWIDTH] = (primIdx * 0xdeece66d + 0xb) & 0xFFFFFF; // color is hashed primitive index
+#else
 			int v0idx = primIdx * 3, v1idx = v0idx + 1, v2idx = v0idx + 2;
 			if (inds) v0idx = indices[v0idx], v1idx = indices[v1idx], v2idx = indices[v2idx];
 			bvhvec3 v0 = vertices[v0idx];
 			bvhvec3 v1 = vertices[v1idx];
 			bvhvec3 v2 = vertices[v2idx];
-			bvhvec3 N = tinybvh_normalize( tinybvh_cross( v1 - v0, v2 - v0 ) );
-			int c = (int)(255.9f * fabs( tinybvh_dot( N, L ) ));
+			bvhvec3 N = tinybvh_normalize(tinybvh_cross(v1 - v0, v2 - v0));
+			int c = (int)(255.9f * fabs(tinybvh_dot(N, L)));
 			buf[pixel_x + pixel_y * SCRWIDTH] = c + (c << 8) + (c << 16);
-			// buf[pixel_x + pixel_y * SCRWIDTH] = (primIdx * 0xdeece66d + 0xb) & 0xFFFFFF; // color is hashed primitive index
-			// buf[pixel_x + pixel_y * SCRWIDTH] = depths[i] << 17; // render depth as red
+#endif
 		}
 	}
+
+	// print frame time / rate in window title
+	char title[50];
+	sprintf(title, "tiny_bvh %.2f s %.2f Hz", delta_time_s, 1.0f / delta_time_s);
+	fenster_update_title(&f, title);
 }
 
 void Shutdown()
@@ -204,5 +229,7 @@ void Shutdown()
 
 	// delete allocated buffers
 	tinybvh::free64( rays );
+#ifdef COLOR_DEPTH
 	tinybvh::free64( depths );
+#endif
 }
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