diff --git a/demo/test50-0b.jpg b/demo/test50-0b.jpg
new file mode 100644
index 0000000..9a322fc
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diff --git a/demo/test50-0c.jpg b/demo/test50-0c.jpg
new file mode 100644
index 0000000..150d321
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diff --git a/demo/test50-1b.jpg b/demo/test50-1b.jpg
new file mode 100644
index 0000000..a7b1ab4
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diff --git a/demo/test50-1c.jpg b/demo/test50-1c.jpg
new file mode 100644
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diff --git a/demo/test50-2b.jpg b/demo/test50-2b.jpg
new file mode 100644
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diff --git a/src/Renderer.cpp b/src/Renderer.cpp
index 921ca6e..d87738d 100644
--- a/src/Renderer.cpp
+++ b/src/Renderer.cpp
@@ -18,7 +18,7 @@ Color ray_color(const Ray &r, const Hittable& world, int depth){
     hit_record rec;
     if(depth < effective_depth) effective_depth = depth;
     if(depth <= 0)
-        return Color(0,0,0);
+        return Color(1,0,0);
 
     if(world.hit(r,0.001,INFINITY,rec)){
         Ray scattered;
diff --git a/third_party/cxxopts b/third_party/cxxopts
new file mode 160000
index 0000000..714a105
--- /dev/null
+++ b/third_party/cxxopts
@@ -0,0 +1 @@
+Subproject commit 714a105fe6e965df780c4c6f3c51affde2ca7075