add client side terrain without collision

src/satx.js

@@ -6,6 +6,18 @@ export default class SATX {
       return SAT.testCircleCircle(collider1, collider2)
     }
 
+    if (collider1 instanceof SAT.Circle && collider2 instanceof SAT.Polygon) {
+      return SAT.testCirclePolygon(collider1, collider2)
+    }
+
+    if (collider1 instanceof SAT.Polygon && collider2 instanceof SAT.Circle) {
+      return SAT.testPolygonCircle(collider1, collider2)
+    }
+
+    if (collider1 instanceof SAT.Polygon && collider2 instanceof SAT.Polygon) {
+      return SAT.testPolygonPolygon(collider1, collider2)
+    }
+
     return false
   }
 }