diff --git a/.idea/uiDesigner.xml b/.idea/uiDesigner.xml
new file mode 100644
index 0000000..e96534f
--- /dev/null
+++ b/.idea/uiDesigner.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 06379bf..2525b02 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,13 +2,8 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="859a87a7-9353-4bac-b28a-a1d9067ab6a4" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/minecraftportal.iml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/runConfigurations/Run_Server.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/runConfigurations/Run_Server.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/TODO" beforeDir="false" afterPath="$PROJECT_DIR$/TODO" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/build.gradle" beforeDir="false" afterPath="$PROJECT_DIR$/build.gradle" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/out/" />
     <ignored path="$PROJECT_DIR$/.gradle/" />
@@ -59,11 +54,47 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="248">
-              <caret line="22" column="63" lean-forward="true" selection-start-line="22" selection-start-column="63" selection-end-line="22" selection-end-column="63" />
+            <state relative-caret-position="116">
+              <caret line="8" column="6" selection-start-line="8" selection-start-column="6" selection-end-line="8" selection-end-column="6" />
+              <folding>
+                <element signature="e#43#311#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="225">
+              <caret line="70" column="25" selection-start-line="70" selection-start-column="25" selection-end-line="70" selection-end-column="25" />
+              <folding>
+                <element signature="e#43#294#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="299">
+              <caret line="29" column="9" lean-forward="true" selection-start-line="29" selection-start-column="9" selection-end-line="29" selection-end-column="9" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="51">
+              <caret line="13" selection-start-line="13" selection-end-line="13" />
+              <folding>
+                <element signature="e#54#110#0" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
@@ -83,12 +114,14 @@
     <option name="RECENT_TEMPLATES">
       <list>
         <option value="Kotlin Class" />
+        <option value="Kotlin File" />
       </list>
     </option>
   </component>
   <component name="FindInProjectRecents">
     <findStrings>
       <find>1</find>
+      <find>.add</find>
     </findStrings>
     <dirStrings>
       <dir>$PROJECT_DIR$</dir>
@@ -106,7 +139,13 @@
         <option value="$PROJECT_DIR$/.gitignore" />
         <option value="$PROJECT_DIR$/build.gradle" />
         <option value="$PROJECT_DIR$/TODO" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/FrameManager.kt" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/VectorExtensions.kt" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/VectorExtensions.kt" />
         <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt" />
+        <option value="$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt" />
       </list>
     </option>
   </component>
@@ -141,6 +180,36 @@
               <item name="minecraftportal" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
             </path>
+            <path>
+              <item name="minecraftportal" type="b2602c69:ProjectViewProjectNode" />
+              <item name="minecraftportal" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+            </path>
+            <path>
+              <item name="minecraftportal" type="b2602c69:ProjectViewProjectNode" />
+              <item name="minecraftportal" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="kotlin" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="minecraftportal" type="b2602c69:ProjectViewProjectNode" />
+              <item name="minecraftportal" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="kotlin" type="462c0819:PsiDirectoryNode" />
+              <item name="minecraftportal" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="minecraftportal" type="b2602c69:ProjectViewProjectNode" />
+              <item name="minecraftportal" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="kotlin" type="462c0819:PsiDirectoryNode" />
+              <item name="minecraftportal" type="462c0819:PsiDirectoryNode" />
+              <item name="extensions" type="462c0819:PsiDirectoryNode" />
+            </path>
           </expand>
           <select />
         </subPane>
@@ -165,6 +234,9 @@
     <key name="MoveKotlinTopLevelDeclarationsDialog.RECENTS_KEY">
       <recent name="org.deliciousreya.minecraftportal" />
     </key>
+    <key name="MoveFile.RECENT_KEYS">
+      <recent name="C:\Users\serynth\IdeaProjects\minecraftportal\src\main\kotlin\net\deliciousreya\minecraftportal\extensions" />
+    </key>
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
@@ -215,7 +287,7 @@
       <workItem from="1554828993158" duration="8169000" />
       <workItem from="1554897237397" duration="4177000" />
       <workItem from="1554901673860" duration="1439000" />
-      <workItem from="1554903259740" duration="889000" />
+      <workItem from="1554903259740" duration="4714000" />
     </task>
     <task id="LOCAL-00001" summary="Base check-in of build settings etc.">
       <created>1554832667584</created>
@@ -280,11 +352,25 @@
       <option name="project" value="LOCAL" />
       <updated>1554901123221</updated>
     </task>
-    <option name="localTasksCounter" value="10" />
+    <task id="LOCAL-00010" summary="Fix glass detection">
+      <created>1554904174549</created>
+      <option name="number" value="00010" />
+      <option name="presentableId" value="LOCAL-00010" />
+      <option name="project" value="LOCAL" />
+      <updated>1554904174549</updated>
+    </task>
+    <task id="LOCAL-00011" summary="Detect glass frames being placed, with full logging.">
+      <created>1554907968725</created>
+      <option name="number" value="00011" />
+      <option name="presentableId" value="LOCAL-00011" />
+      <option name="project" value="LOCAL" />
+      <updated>1554907968725</updated>
+    </task>
+    <option name="localTasksCounter" value="12" />
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="14674000" />
+    <option name="totallyTimeSpent" value="18499000" />
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -299,7 +385,7 @@
     <frame x="-8" y="-8" width="1936" height="1096" extended-state="6" />
     <editor active="true" />
     <layout>
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.26066098" />
+      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.26066098" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Designer" order="2" />
       <window_info id="Image Layers" order="3" />
@@ -314,11 +400,11 @@
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info anchor="bottom" id="TODO" order="6" weight="0.32931727" />
       <window_info anchor="bottom" id="Build" order="7" weight="0.3509865" />
-      <window_info anchor="bottom" id="Terminal" order="8" visible="true" weight="0.5867082" />
+      <window_info anchor="bottom" id="Terminal" order="8" weight="0.5867082" />
       <window_info anchor="bottom" id="Docker" order="9" show_stripe_button="false" />
       <window_info anchor="bottom" id="Event Log" order="10" side_tool="true" />
       <window_info anchor="bottom" id="Database Changes" order="11" />
-      <window_info anchor="bottom" id="Version Control" order="12" weight="0.32851407" />
+      <window_info active="true" anchor="bottom" id="Version Control" order="12" visible="true" weight="0.3281412" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
@@ -344,7 +430,9 @@
     <MESSAGE value="Ignore local.properties" />
     <MESSAGE value="Remove local.properties" />
     <MESSAGE value="Add glass detection" />
-    <option name="LAST_COMMIT_MESSAGE" value="Add glass detection" />
+    <MESSAGE value="Fix glass detection" />
+    <MESSAGE value="Detect glass frames being placed, with full logging." />
+    <option name="LAST_COMMIT_MESSAGE" value="Detect glass frames being placed, with full logging." />
   </component>
   <component name="editorHistoryManager">
     <entry file="file://$PROJECT_DIR$/build/resources/main/plugin.yml" />
@@ -384,10 +472,40 @@
     <entry file="file://$PROJECT_DIR$/TODO">
       <provider selected="true" editor-type-id="text-editor" />
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="51">
+          <caret line="13" selection-start-line="13" selection-end-line="13" />
+          <folding>
+            <element signature="e#54#110#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="248">
-          <caret line="22" column="63" lean-forward="true" selection-start-line="22" selection-start-column="63" selection-end-line="22" selection-end-column="63" />
+        <state relative-caret-position="116">
+          <caret line="8" column="6" selection-start-line="8" selection-start-column="6" selection-end-line="8" selection-end-column="6" />
+          <folding>
+            <element signature="e#43#311#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="299">
+          <caret line="29" column="9" lean-forward="true" selection-start-line="29" selection-start-column="9" selection-end-line="29" selection-end-column="9" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="225">
+          <caret line="70" column="25" selection-start-line="70" selection-start-column="25" selection-end-line="70" selection-end-column="25" />
+          <folding>
+            <element signature="e#43#294#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
diff --git a/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt b/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt
index 902a786..f27bb5e 100644
--- a/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt
+++ b/src/main/kotlin/net/deliciousreya/minecraftportal/MinecraftPortalPlugin.kt
@@ -4,8 +4,6 @@ import org.bukkit.Material
 import org.bukkit.event.EventHandler
 import org.bukkit.event.Listener
 import org.bukkit.event.block.BlockPlaceEvent
-import org.bukkit.event.player.PlayerJoinEvent
-import org.bukkit.inventory.ItemStack
 import org.bukkit.plugin.java.JavaPlugin
 
 class MinecraftPortalPlugin() : JavaPlugin(), Listener
@@ -21,6 +19,12 @@ class MinecraftPortalPlugin() : JavaPlugin(), Listener
         logger.info("block placed of type " + e.block.type)
         if (e.block.type.equals(Material.GLASS)) {
             logger.info("put down glass at " + e.block.location)
+            val portalScanResults = findPortalFrameConnectedTo(e.block)
+            if (portalScanResults.frame != null) {
+                logger.info("found portal frame $portalScanResults")
+            } else {
+                logger.info("no portal frame found, best scan was $portalScanResults")
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt b/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt
new file mode 100644
index 0000000..a86f886
--- /dev/null
+++ b/src/main/kotlin/net/deliciousreya/minecraftportal/PortalFrame.kt
@@ -0,0 +1,96 @@
+package net.deliciousreya.minecraftportal
+
+import com.google.common.collect.ImmutableList
+import org.bukkit.Location
+import org.bukkit.Material.AIR
+import org.bukkit.Material.GLASS
+import org.bukkit.block.Block
+import org.bukkit.util.Vector
+import net.deliciousreya.minecraftportal.extensions.*
+
+fun findPortalFrameConnectedTo(block:Block): PortalScanResults {
+    var bestScan:PortalScanResults? = null
+    if (block.type == GLASS) {
+        for (direction in PortalFrame.Direction.values()) {
+            for (vector in direction.glassOffsets) {
+                val scanResult = checkPortalFrameAt(block.location.subtract(vector), direction)
+                if (scanResult.frame != null) {
+                    return scanResult
+                }
+                if (bestScan == null || scanResult > bestScan) {
+                    bestScan = scanResult
+                }
+            }
+        }
+    }
+    if (block.type == GLASS) {
+        for (direction in PortalFrame.Direction.values()) {
+            val scanResult = checkPortalFrameAt(block.location.subtract(direction.mineralOffset), direction)
+            if (scanResult.frame != null) {
+                return scanResult
+            } else if (bestScan == null || scanResult > bestScan) {
+                bestScan = scanResult
+            }
+        }
+    }
+    if (bestScan != null) {
+        return bestScan
+    } else {
+        return PortalScanResults(null, ImmutableList.of(), ImmutableList.of())
+    }
+}
+
+/** Detects whether there is a portal frame in the given location, extending in the given direction. */
+fun checkPortalFrameAt(location:Location, direction:PortalFrame.Direction): PortalScanResults {
+    val matches = ImmutableList.Builder<Block>()
+    val nonmatches = ImmutableList.Builder<Block>()
+    for (vector in direction.glassOffsets) {
+        val block = (location + vector).block
+        (if (block.type == GLASS) matches else nonmatches).add(block)
+    }
+    for (vector in direction.airOffsets) {
+        val block = (location + vector).block
+        (if (block.type == AIR) matches else nonmatches).add(block)
+    }
+    val block = (location + direction.mineralOffset).block
+    (if (block.type == GLASS) matches else nonmatches).add(block)
+    val nonmatchesBuilt = nonmatches.build()
+    return PortalScanResults(if (nonmatchesBuilt.isEmpty()) {PortalFrame(location, direction)} else {null}, matches.build(), nonmatchesBuilt)
+}
+
+data class PortalScanResults(val frame: PortalFrame?, val matchingBlocks:List<Block>, val nonMatchingBlocks:List<Block>) : Comparable<PortalScanResults> {
+    override fun compareTo(other:PortalScanResults): Int {
+        return matchingBlocks.size - other.matchingBlocks.size
+    }
+}
+
+/** Information about a portal frame. */
+data class PortalFrame(val lowerLeftCorner: Location, val direction: Direction) {
+    val UP = Vector(0, 1, 0)
+    /** The direction along which a portal frame extends. */
+    enum class Direction(vector: Vector) {
+        X_AXIS(Vector(1, 0, 0)),
+        Z_AXIS(Vector(0, 0, 1));
+
+        private val rightSideVector = vector * 2
+
+        val glassOffsets: ImmutableList<Vector> = ImmutableList.of(
+            Vector(0, 0, 0),
+            Vector(0, 1, 0),
+            Vector(0, 2, 0),
+            Vector(0, 3, 0),
+            vector,
+            rightSideVector,
+            Vector(0, 1, 0) + rightSideVector,
+            Vector(0, 2, 0) + rightSideVector,
+            Vector(0, 3, 0) + rightSideVector
+        )
+
+        val mineralOffset: Vector = Vector(0, 3, 0) + vector
+
+        val airOffsets: ImmutableList<Vector> = ImmutableList.of(
+            Vector(0, 1, 0) + vector,
+            Vector(0, 2, 0) + vector
+        )
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt b/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt
new file mode 100644
index 0000000..cb404c5
--- /dev/null
+++ b/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Location.kt
@@ -0,0 +1,32 @@
+package net.deliciousreya.minecraftportal.extensions
+
+import org.bukkit.Location
+import org.bukkit.util.Vector
+
+operator fun Location.plus(v: Vector):Location {
+    return this.clone().add(v)
+}
+
+operator fun Location.plus(l: Location):Location {
+    return this.clone().add(l)
+}
+
+fun Location.plus(x: Double, y: Double, z: Double):Location {
+    return this.clone().add(x, y, z)
+}
+
+operator fun Location.minus(v:Vector):Location {
+    return this.clone().subtract(v)
+}
+
+operator fun Location.minus(l: Location):Location {
+    return this.clone().subtract(l)
+}
+
+fun Location.minus(x: Double, y: Double, z: Double):Location {
+    return this.clone().subtract(x, y, z)
+}
+
+operator fun Location.times(n:Double):Location {
+    return this.clone().multiply(n)
+}
\ No newline at end of file
diff --git a/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt b/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt
new file mode 100644
index 0000000..3073049
--- /dev/null
+++ b/src/main/kotlin/net/deliciousreya/minecraftportal/extensions/Vector.kt
@@ -0,0 +1,31 @@
+package net.deliciousreya.minecraftportal.extensions
+
+import org.bukkit.util.Vector
+
+operator fun Vector.plus(v:Vector):Vector {
+    return this.clone().add(v)
+}
+
+operator fun Vector.minus(v:Vector):Vector {
+    return this.clone().subtract(v)
+}
+
+operator fun Vector.times(n:Int):Vector {
+    return this.clone().multiply(n)
+}
+
+operator fun Vector.times(n:Float):Vector {
+    return this.clone().multiply(n)
+}
+
+operator fun Vector.times(n:Double):Vector {
+    return this.clone().multiply(n)
+}
+
+operator fun Vector.times(v:Vector):Vector {
+    return this.clone().multiply(v)
+}
+
+operator fun Vector.div(v:Vector):Vector {
+    return this.clone().divide(v)
+}
\ No newline at end of file