diff --git a/shaders/fragment.glsl b/shaders/fragment.glsl
index 9ef9b91..de2235b 100644
--- a/shaders/fragment.glsl
+++ b/shaders/fragment.glsl
@@ -1,8 +1,47 @@
 #version 330 core
 
-smooth in vec3 color;
+uniform mat4 mWorld;
+uniform mat4 mView;
+uniform mat4 mProjection;
+uniform vec3 vEye;
+
+in float zPos;
+in vec3 norm;
+
 out vec4 frag_colour;
 
+vec3 hsv_to_rgb(float h, float s, float v)
+{
+	float c = v * s;
+	h = mod((h * 6.0), 6.0);
+	float x = c * (1.0 - abs(mod(h, 2.0) - 1.0));
+	vec3 color;
+
+	if (0.0 <= h && h < 1.0) {
+		color = vec3(c, x, 0.0);
+	} else if (1.0 <= h && h < 2.0) {
+		color = vec3(x, c, 0.0);
+	} else if (2.0 <= h && h < 3.0) {
+		color = vec3(0.0, c, x);
+	} else if (3.0 <= h && h < 4.0) {
+		color = vec3(0.0, x, c);
+	} else if (4.0 <= h && h < 5.0) {
+		color = vec3(x, 0.0, c);
+	} else if (5.0 <= h && h < 6.0) {
+		color = vec3(c, 0.0, x);
+	} else {
+		color = vec3(0.0, 0.0, 0.0);
+	}
+
+	color.rgb += v - c;
+
+	return color;
+}
+
 void main () {
+    vec3 materialColor = hsv_to_rgb(zPos, 1, 1);
+	float diffuse = clamp(dot(norm, -normalize(vec3(1,1,1))), 0.1, 0.6);
+	vec3 color = materialColor*diffuse;
+
 	frag_colour = vec4(color, 1.0);
 }
\ No newline at end of file
diff --git a/shaders/vertex.glsl b/shaders/vertex.glsl
index 0cd713c..d2ceb24 100644
--- a/shaders/vertex.glsl
+++ b/shaders/vertex.glsl
@@ -8,7 +8,8 @@ uniform vec3 vEye;
 layout (location = 0) in vec3 position;
 layout (location = 1) in vec3 normal;
 
-smooth out vec3 color;
+out float zPos;
+out vec3 norm;
 
 vec3 hsv_to_rgb(float h, float s, float v)
 {
@@ -39,9 +40,11 @@ vec3 hsv_to_rgb(float h, float s, float v)
 }
 
 void main () {
+    norm = -normalize(vec3(mProjection*mView*mWorld*vec4(normal, 0)));
+    zPos = position.z;
 	gl_Position = mProjection*mView*mWorld*vec4(position, 1.0);
 
-    vec3 materialColor = hsv_to_rgb(position.z, 1, 1);
-	float brightness = clamp(dot(normalize(normal), normalize(vEye)), 0.4, 0.6);
-	color = materialColor*brightness;
+//    vec3 materialColor = hsv_to_rgb(position.z, 1, 1);
+//	float brightness = clamp(dot(normalize(normal), normalize(vEye)), 0.4, 0.6);
+//	color = materialColor*brightness;
 }
diff --git a/src/GLObjects/Mesh.cpp b/src/GLObjects/Mesh.cpp
index efdccf1..eb99428 100644
--- a/src/GLObjects/Mesh.cpp
+++ b/src/GLObjects/Mesh.cpp
@@ -60,8 +60,8 @@ void Mesh::updateVertices() const {
             glm::vec3 v2 = p2 - p3;
             glm::vec3 v3 = p4 - p3;
 
-            glm::vec3 norm1 = glm::cross(v1, v2);
-            glm::vec3 norm2 = glm::cross(v2, v3);
+            glm::vec3 norm1 = glm::cross(v2, v1);
+            glm::vec3 norm2 = glm::cross(v3, v2);
 
             _normals.emplace_back(norm1);
             _normals.emplace_back(norm2);
diff --git a/src/OGL.cpp b/src/OGL.cpp
index 9b1312a..d99c5d5 100644
--- a/src/OGL.cpp
+++ b/src/OGL.cpp
@@ -54,7 +54,11 @@ void cursorPositionCallback(GLFWwindow* window, double xpos, double ypos) {
 		float dy = (float)(ypos - lastY);
 		static const float coeff = 0.01f;
 		if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS) {
-			Camera::instance()->mouseMoveAroundCenter(coeff*dx, coeff*dy);
+			//Camera::instance()->mouseMoveAroundCenter(coeff*dx, coeff*dy);
+			for(IGLObject* obj: OGL::instance()->_glObjects) {
+				obj->rotate(glm::vec3(coeff*dy, 0.f, coeff*dx));
+				obj->update();
+			}
 		}
 	}
 
diff --git a/src/OGL.h b/src/OGL.h
index 0121735..dd62d52 100644
--- a/src/OGL.h
+++ b/src/OGL.h
@@ -19,6 +19,7 @@ private:
 	OGL(const OGL &) = delete;
 	void operator=(const OGL &) = delete;
 	void updateFpsCounter() const;
+	friend void cursorPositionCallback(GLFWwindow* window, double xpos, double ypos);
 
 public:
 	static OGL * instance();