VR portal rendering

Assets/Escape Room Engine/Portal/PlayerCamera.cs

@@ -0,0 +1,13 @@
+using UnityEngine;
+
+namespace Escape_Room_Engine.Portal
+{
+    public class PlayerCamera : MonoBehaviour
+    {
+        public Camera camera;
+        [SerializeField] private Transform leftEye, rightEye;
+
+        public Transform getEyeTransform(Camera.StereoscopicEye eye) =>
+            eye == Camera.StereoscopicEye.Left ? leftEye : rightEye;
+    }
+}

Assets/Escape Room Engine/Portal/PlayerCamera.cs.meta

@@ -0,0 +1,11 @@
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Assets/Escape Room Engine/Portal/Portal.cs

@@ -1,22 +1,31 @@
 using System;
+using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Rendering;
 using UnityEngine.Rendering.Universal;
+using UnityEngine.XR;
 
 namespace Escape_Room_Engine.Portal
 {
     public class Portal : MonoBehaviour
     {
         private static readonly Matrix4x4 HalfRotation = Matrix4x4.Rotate(Quaternion.Euler(0, 180, 0));
+        private static readonly Camera.StereoscopicEye[] Eyes =
+            { Camera.StereoscopicEye.Left, Camera.StereoscopicEye.Right };
+        private static readonly Dictionary<Camera.StereoscopicEye, int> EyeTextureNames = new()
+            {
+                { Camera.StereoscopicEye.Left, Shader.PropertyToID("_LeftTex") },
+                { Camera.StereoscopicEye.Right, Shader.PropertyToID("_RightTex") }
+            };
 
         /// <summary>
         /// The portal that is connected with this one.
         /// </summary>
         public Portal other;
         /// <summary>
-        /// The main camera to take the position for the portal camera from.
+        /// The minimum near clip plane distance to be used when calculating the oblique clip plane.
         /// </summary>
-        [SerializeField] private Camera playerCamera;
+        public float minNearClipPlane = 0.02f;
         /// <summary>
         /// The camera that will draw the view for this portal.
         /// </summary>
@@ -26,24 +35,17 @@ namespace Escape_Room_Engine.Portal
         /// </summary>
         [SerializeField] private MeshRenderer portalQuad;
 
-        private RenderTexture _texture;
+        private PlayerCamera _playerCamera;
+        private Dictionary<Camera.StereoscopicEye, RenderTexture> _textures = new();
 
         private void Awake()
         {
             // check whether the other portal is set up
-            if (!other || other.other != this) throw new Exception("Other Portal not set up correctly.");
+            if (!other || other.other != this) throw new Exception("Other portal not set up correctly.");
-            // check whether the player camera is set up
-            if (!playerCamera) throw new Exception("No camera initialised.");
             
-            // create render texture
+            // get player camera
-            if (!_texture) _texture = new RenderTexture(Screen.width, Screen.height, 24, RenderTextureFormat.ARGB32);
+            if (Camera.main != null) _playerCamera = Camera.main.GetComponent<PlayerCamera>();
-        }
+            else throw new Exception("Main camera has no player camera script set up.");
-
-        private void Start()
-        {
-            // assign render texture
-            portalCamera.targetTexture = _texture;
-            other.portalQuad.material.mainTexture = _texture;
         }
 
         private void OnEnable()
@@ -60,21 +62,41 @@ namespace Escape_Room_Engine.Portal
         {
             var t = transform;
 
-            // position portal camera
+            foreach (var eye in Eyes)
-            var portalCameraMatrix = t.localToWorldMatrix * HalfRotation * other.transform.worldToLocalMatrix *
+            {
-                                     playerCamera.transform.localToWorldMatrix;
+                // create portal texture if it doesn't exist yet
-            portalCamera.transform.SetPositionAndRotation(portalCameraMatrix.GetPosition(), portalCameraMatrix.rotation);
+                if (!_textures.ContainsKey(eye))
+                {
+                    if (XRSettings.eyeTextureWidth > 0 && XRSettings.eyeTextureHeight > 0)
+                    {
+                        _textures.Add(eye,
+                            new RenderTexture(XRSettings.eyeTextureWidth, XRSettings.eyeTextureHeight, 24));
+                        other.portalQuad.material.SetTexture(EyeTextureNames[eye], _textures[eye]);
+                    }
+                    else // no texture was created so nothing should be rendered
+                        continue;
+                }
                 
-            // set camera clip plane to portal (otherwise the wall behind the portal would be rendered)
+                // position portal camera
-            // calculating the clip plane: https://computergraphics.stackexchange.com/a/1506
+                var m = t.localToWorldMatrix * HalfRotation * other.transform.worldToLocalMatrix *
-            var n = -t.forward; // clip plane normal
+                        _playerCamera.getEyeTransform(eye).localToWorldMatrix;
-            var portalPlane = new Plane(n, t.position); // clip plane in world space
+                portalCamera.transform.SetPositionAndRotation(m.GetPosition(), m.rotation);
-            var clipPlane = portalCamera.worldToCameraMatrix.inverse.transpose *
+                portalCamera.projectionMatrix = _playerCamera.camera.GetStereoProjectionMatrix(eye);
-                            new Vector4(n.x, n.y, n.z, portalPlane.distance); // vector format clip plane in camera space
-            portalCamera.projectionMatrix = playerCamera.CalculateObliqueMatrix(clipPlane);
         
-            // render portal view
+                // set camera clip plane to portal (otherwise the wall behind the portal would be rendered)
-            UniversalRenderPipeline.RenderSingleCamera(scriptableRenderContext, portalCamera);
+                // calculating the clip plane: https://computergraphics.stackexchange.com/a/1506
+                var n = -t.forward; // clip plane normal
+                var portalPlane = new Plane(n, t.position); // clip plane in world space
+                var clipPlane = portalCamera.worldToCameraMatrix.inverse.transpose *
+                                new Vector4(n.x, n.y, n.z, portalPlane.distance); // vector format clip plane in camera space
+                if (Math.Abs(portalPlane.GetDistanceToPoint(portalCamera.transform.position)) >= minNearClipPlane)
+                    // only adjust the near clip plane if it doesn't intersect with the camera
+                    portalCamera.projectionMatrix = portalCamera.CalculateObliqueMatrix(clipPlane);
+        
+                // render portal view
+                portalCamera.targetTexture = _textures[eye];
+                UniversalRenderPipeline.RenderSingleCamera(scriptableRenderContext, portalCamera);
+            }
         }
     }
 }

Assets/Escape Room Engine/Portal/Portal.mat

@@ -12,7 +12,7 @@ Material:
   m_ValidKeywords: []
   m_InvalidKeywords: []
   m_LightmapFlags: 4
-  m_EnableInstancingVariants: 0
+  m_EnableInstancingVariants: 1
   m_DoubleSidedGI: 0
   m_CustomRenderQueue: -1
   stringTagMap: {}

Assets/Escape Room Engine/Portal/Portal.prefab

@@ -48,7 +48,6 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   other: {fileID: 0}
-  playerCamera: {fileID: 0}
   portalCamera: {fileID: 7791795762741173939}
   portalQuad: {fileID: 6216133567950691622}
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@@ -239,7 +238,7 @@ MonoBehaviour:
   m_StopNaN: 0
   m_Dithering: 0
   m_ClearDepth: 1
-  m_AllowXRRendering: 1
+  m_AllowXRRendering: 0
   m_RequiresDepthTexture: 0
   m_RequiresColorTexture: 0
   m_Version: 2

Assets/Escape Room Engine/Portal/PortalShader.shader

@@ -2,12 +2,13 @@ Shader "Escape Room Engine/Portal"
 {
     Properties
     {
-        _MainTex("Portal Texture", 2D) = "" {}
+        _LeftTex("Left Eye Texture", 2D) = "" {}
+        _RightTex("Right Eye Texture", 2D) = "" {}
     }
 
     SubShader
     {
-        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" "Queue" = "Geometry" }
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" }
 
         Pass
         {
@@ -21,33 +22,45 @@ Shader "Escape Room Engine/Portal"
             HLSLPROGRAM
             #pragma vertex vert
             #pragma fragment frag
-
+            #pragma multi_compile_instancing
             #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
 
-            uniform sampler2D _MainTex;
-
             struct Attributes
             {
-                float4 vertex : POSITION;
+                float4 positionOS : POSITION;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
             };
 
             struct Varyings
             {
-                float4 vertex : SV_POSITION;
+                float4 positionHCS : SV_POSITION;
-                float4 screen : TEXCOORD0;
+                float4 positionScreen : TEXCOORD0;
+                UNITY_VERTEX_OUTPUT_STEREO
             };
 
+            uniform sampler2D _LeftTex, _RightTex;
+
             Varyings vert(Attributes IN)
             {
                 Varyings OUT;
-                OUT.vertex = TransformObjectToHClip(IN.vertex.xyz);
+                UNITY_SETUP_INSTANCE_ID(IN);
-                OUT.screen = ComputeScreenPos(OUT.vertex);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
+                
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                // calculate the screen position which is used to map the portal texture onto the portal
+                OUT.positionScreen = ComputeScreenPos(OUT.positionHCS);
+                
                 return OUT;
             }
 
             half4 frag(Varyings IN) : SV_Target
             {
-                return tex2D(_MainTex, IN.screen.xy / IN.screen.w);
+                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(IN);
+
+                const float2 uv = IN.positionScreen.xy / IN.positionScreen.w;
+
+                // sample from the correct texture depending on the eye rendered
+                return unity_StereoEyeIndex == 0 ? tex2D(_LeftTex, uv) : tex2D(_RightTex, uv);
             }
             ENDHLSL
         }

Assets/Scenes/PortalScene.unity

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@@ -902,6 +1040,21 @@ Camera:
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