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diff --git a/dev/a5-artrender/shaders/gouraud.vert b/dev/a5-artrender/shaders/gouraud.vert
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+#version 330
+
+// Gouraud Shader Example
+
+// INPUTS:
+
+// uniform = variables passed in from the C++ code
+// model and camera matrices:
+uniform mat4 model_view_matrix;
+uniform mat4 normal_matrix;
+uniform mat4 proj_matrix;
+
+// properties of the light:
+uniform vec3 light_in_eye_space;
+uniform vec4 Ia, Id, Is;
+
+// properties of the material we are lighting:
+uniform vec4 ka, kd, ks;
+uniform float s;
+
+
+// these variables come from the mesh data stored in buffers in gfx card memory
+layout(location = 0) in vec3 vertex;
+layout(location = 1) in vec3 normal;
+
+
+// OUTPUT TO SEND TO THE RASTERIZER FOR THIS VERTEX:
+
+// for Gouraud shading, the key output of the vertex shader is the color
+// calculated based on lighting this vertex
+out vec4 color;
+
+
+void main() {
+    
+    // transform the vertex position into "eye space"
+    vec3 v;
+
+    // unit vector from the vertex to the light
+    vec3 l;
+    
+    // unit vector from the vertex to the eye point, which is at 0,0,0 in "eye space"
+    vec3 e;
+
+    // normal transformed into "eye space"
+    vec3 n;
+    
+    // halfway vector
+    vec3 h;
+
+
+	// calculating lighting output the color for this vertex
+    // ... 
+
+       
+    // do the standard projection of the incoming vertex
+    gl_Position = proj_matrix * model_view_matrix * vec4(vertex,1);
+}