render stencil portals (transparent)

Assets/Portal/Assets/Materials/PortalDepth.mat

@@ -0,0 +1,30 @@
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+  m_ObjectHideFlags: 0
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+  m_Name: PortalDepth
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+    m_TexEnvs: []
+    m_Ints: []
+    m_Floats:
+    - _PortalNumber: 0
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Assets/Portal/Assets/Materials/PortalDepth.mat.meta

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Assets/Portal/Assets/Materials/PortalDepth.shader

@@ -0,0 +1,12 @@
+Shader "Escape Room Engine/PortalDepth" {
+    SubShader {
+        Pass {
+            ColorMask 0
+
+            Stencil {
+                Ref 1
+                Comp LEqual
+            }
+        }
+    }
+}

Assets/Portal/Assets/Materials/PortalDepth.shader.meta

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