3d is supposed to be lowercase

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/SigRenderer.java

@@ -17,7 +17,7 @@ public class SigRenderer implements MouseListener,MouseMotionListener{
     }
 
     SigRenderer(JFrame f) {
-        tri = new Triangle(new Vector3D(),new Vector3D(),new Vector3D());
+        tri = new Triangle(new Vector3d(),new Vector3d(),new Vector3d());
         System.out.println(tri);   
 
         Panel p = new Panel();

src/sig/Triangle.java

@@ -1,8 +1,10 @@
 package sig;
 
+import javax.vecmath.Vector3d;
+
 public class Triangle {
-    Vector3D A,B,C;
+    Vector3d A,B,C;
-    Triangle(Vector3D A,Vector3D B,Vector3D C) {
+    Triangle(Vector3d A,Vector3d B,Vector3d C) {
         this.A=A;
         this.B=B;
         this.C=C;