diff --git a/labs/3/renderSuite/Sphere.java b/labs/3/renderSuite/Sphere.java
index 63ed2b6..054cbfa 100644
--- a/labs/3/renderSuite/Sphere.java
+++ b/labs/3/renderSuite/Sphere.java
@@ -4,8 +4,7 @@ import renderSuite.Vec3;
 import renderSuite.Util;
 import renderSuite.Ray;
 
-public class Sphere {
-    Vec3 p, c;
+public class Sphere extends Surface {
     double r;
 
     public Sphere(Vec3 position, Vec3 color, double radius) {
diff --git a/labs/3/renderSuite/Surface.java b/labs/3/renderSuite/Surface.java
new file mode 100644
index 0000000..bd51fdd
--- /dev/null
+++ b/labs/3/renderSuite/Surface.java
@@ -0,0 +1,39 @@
+package renderSuite;
+
+import renderSuite.Vec3;
+//import renderSuite.Util;
+//import renderSuite.Ray;
+
+public class Surface {
+    Vec3 p, c;
+
+    public void main() {
+
+    }
+
+    /*
+    public boolean intersect(Ray r) {
+        // OLD
+        //double dist = Util.d(ray_position, position);
+        //return (Util.d(ray_position, position) <= radius);
+
+        // using RTX
+        Vec3 l = new Vec3(this.p.x - r.p.x,
+                          this.p.y - r.p.y,
+                          this.p.z - r.p.z);
+
+        Vec3 nl = l.get_norm();
+        double cosine = Util.dot(r.f, nl);
+        
+        // >90 degrees = no intersection
+        if (cosine < 0) {
+            return false;
+        }
+
+        double tc = l.len() * cosine;
+        double d = Math.sqrt( l.len()*l.len() - tc*tc );
+        
+        return (d < this.r);
+    }
+    */
+}