diff --git a/models/Rocks/InvisBall.mtl b/models/Rocks/InvisBall.mtl
new file mode 100644
index 0000000..402ee80
--- /dev/null
+++ b/models/Rocks/InvisBall.mtl
@@ -0,0 +1,12 @@
+newmtl Cave1:pasted__lambert4SG
+illum 4
+Kd 0.13 0.14 0.16
+Ka 0.00 0.00 0.00
+Tf 1.00 1.00 1.00
+Ni 1.00
+newmtl lambert2SG
+illum 4
+Kd 0.50 0.50 0.50
+Ka 0.00 0.00 0.00
+Tf 0.00 0.00 0.00
+Ni 1.00
diff --git a/worlds/rock.json b/worlds/rock.json
index 54a0d3f..ba3e037 100644
--- a/worlds/rock.json
+++ b/worlds/rock.json
@@ -44,6 +44,10 @@
         "color": 100,
         "file": "models/Rocks/Rock10.obj"
       },
+      {
+        "color": 160,
+        "file": "models/Rocks/InvisBall.obj"
+      },
       {
         "color": 170,
         "file": "models/Rocks/DraakHoofd.obj"
diff --git a/worlds/rockHeightmap.pdn b/worlds/rockHeightmap.pdn
index 3f42fdd..24dfcba 100644
Binary files a/worlds/rockHeightmap.pdn and b/worlds/rockHeightmap.pdn differ