non-VR portal rendering

Assets/Escape Room Engine/Portal/Portal Frame.blend.meta

@@ -0,0 +1,106 @@
+fileFormatVersion: 2
+guid: a2052daf99b37934fb434aaffa9e75f2
+ModelImporter:
+  serializedVersion: 21300
+  internalIDToNameTable: []
+  externalObjects: {}
+  materials:
+    materialImportMode: 2
+    materialName: 0
+    materialSearch: 1
+    materialLocation: 1
+  animations:
+    legacyGenerateAnimations: 4
+    bakeSimulation: 0
+    resampleCurves: 1
+    optimizeGameObjects: 0
+    removeConstantScaleCurves: 1
+    motionNodeName: 
+    rigImportErrors: 
+    rigImportWarnings: 
+    animationImportErrors: 
+    animationImportWarnings: 
+    animationRetargetingWarnings: 
+    animationDoRetargetingWarnings: 0
+    importAnimatedCustomProperties: 0
+    importConstraints: 0
+    animationCompression: 1
+    animationRotationError: 0.5
+    animationPositionError: 0.5
+    animationScaleError: 0.5
+    animationWrapMode: 0
+    extraExposedTransformPaths: []
+    extraUserProperties: []
+    clipAnimations: []
+    isReadable: 0
+  meshes:
+    lODScreenPercentages: []
+    globalScale: 1
+    meshCompression: 0
+    addColliders: 0
+    useSRGBMaterialColor: 1
+    sortHierarchyByName: 1
+    importVisibility: 1
+    importBlendShapes: 1
+    importCameras: 1
+    importLights: 1
+    nodeNameCollisionStrategy: 1
+    fileIdsGeneration: 2
+    swapUVChannels: 0
+    generateSecondaryUV: 0
+    useFileUnits: 1
+    keepQuads: 0
+    weldVertices: 1
+    bakeAxisConversion: 0
+    preserveHierarchy: 0
+    skinWeightsMode: 0
+    maxBonesPerVertex: 4
+    minBoneWeight: 0.001
+    optimizeBones: 1
+    meshOptimizationFlags: -1
+    indexFormat: 0
+    secondaryUVAngleDistortion: 8
+    secondaryUVAreaDistortion: 15.000001
+    secondaryUVHardAngle: 88
+    secondaryUVMarginMethod: 1
+    secondaryUVMinLightmapResolution: 40
+    secondaryUVMinObjectScale: 1
+    secondaryUVPackMargin: 4
+    useFileScale: 1
+  tangentSpace:
+    normalSmoothAngle: 60
+    normalImportMode: 0
+    tangentImportMode: 3
+    normalCalculationMode: 4
+    legacyComputeAllNormalsFromSmoothingGroupsWhenMeshHasBlendShapes: 0
+    blendShapeNormalImportMode: 1
+    normalSmoothingSource: 0
+  referencedClips: []
+  importAnimation: 1
+  humanDescription:
+    serializedVersion: 3
+    human: []
+    skeleton: []
+    armTwist: 0.5
+    foreArmTwist: 0.5
+    upperLegTwist: 0.5
+    legTwist: 0.5
+    armStretch: 0.05
+    legStretch: 0.05
+    feetSpacing: 0
+    globalScale: 1
+    rootMotionBoneName: 
+    hasTranslationDoF: 0
+    hasExtraRoot: 0
+    skeletonHasParents: 1
+  lastHumanDescriptionAvatarSource: {instanceID: 0}
+  autoGenerateAvatarMappingIfUnspecified: 1
+  animationType: 2
+  humanoidOversampling: 1
+  avatarSetup: 0
+  addHumanoidExtraRootOnlyWhenUsingAvatar: 1
+  remapMaterialsIfMaterialImportModeIsNone: 0
+  additionalBone: 0
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Escape Room Engine/Portal/Portal Frame.blend1.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: e56607a291566fb47bc0f9f8ab41485c
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Escape Room Engine/Portal/Portal.cs

@@ -1,10 +1,14 @@
 using System;
 using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEngine.Rendering.Universal;
 
 namespace Escape_Room_Engine.Portal
 {
     public class Portal : MonoBehaviour
     {
+        private static readonly Matrix4x4 HalfRotation = Matrix4x4.Rotate(Quaternion.Euler(0, 180, 0));
+        
         /// <summary>
         /// The portal that is connected with this one.
         /// </summary>
@@ -12,25 +16,65 @@ namespace Escape_Room_Engine.Portal
         /// <summary>
         /// The main camera to take the position for the portal camera from.
         /// </summary>
-        [SerializeField] private Transform playerCamera;
+        [SerializeField] private Camera playerCamera;
         /// <summary>
         /// The camera that will draw the view for this portal.
         /// </summary>
-        [SerializeField] private Transform portalCamera;
+        [SerializeField] private Camera portalCamera;
+        /// <summary>
+        /// The quad where the rendered texture will be drawn on.
+        /// </summary>
+        [SerializeField] private MeshRenderer portalQuad;
 
-        private void Start()
+        private RenderTexture _texture;
+
+        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.");
             // check whether the player camera is set up
             if (!playerCamera) throw new Exception("No camera initialised.");
+            
+            // create render texture
+            _texture = new RenderTexture(Screen.width, Screen.height, 24, RenderTextureFormat.ARGB32);
         }
 
-        private void Update()
+        private void Start()
         {
-            var portalCameraMatrix = transform.localToWorldMatrix * other.transform.worldToLocalMatrix *
-                                     playerCamera.localToWorldMatrix;
-            portalCamera.SetPositionAndRotation(portalCameraMatrix.GetPosition(), portalCameraMatrix.rotation);
+            // assign render texture
+            portalCamera.targetTexture = _texture;
+            other.portalQuad.material.mainTexture = _texture;
+        }
+
+        private void OnEnable()
+        {
+            RenderPipelineManager.beginCameraRendering += Render;
+        }
+
+        private void OnDisable()
+        {
+            RenderPipelineManager.beginCameraRendering -= Render;
+        }
+
+        private void Render(ScriptableRenderContext scriptableRenderContext, Camera camera)
+        {
+            var t = transform;
+            
+            // position portal camera
+            var portalCameraMatrix = t.localToWorldMatrix * HalfRotation * other.transform.worldToLocalMatrix *
+                                     playerCamera.transform.localToWorldMatrix;
+            portalCamera.transform.SetPositionAndRotation(portalCameraMatrix.GetPosition(), portalCameraMatrix.rotation);
+            
+            // set camera clip plane to portal (otherwise the wall behind the portal would be rendered)
+            // 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
+            portalCamera.projectionMatrix = playerCamera.CalculateObliqueMatrix(clipPlane);
+            
+            // render portal view
+            UniversalRenderPipeline.RenderSingleCamera(scriptableRenderContext, portalCamera);
         }
     }
 }

Assets/Escape Room Engine/Portal/Portal.mat

@@ -1,18 +1,5 @@
 %YAML 1.1
 %TAG !u! tag:unity3d.com,2011:
---- !u!114 &-3251226002000317928
-MonoBehaviour:
-  m_ObjectHideFlags: 11
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 0}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: d0353a89b1f911e48b9e16bdc9f2e058, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  version: 5
 --- !u!21 &2100000
 Material:
   serializedVersion: 8
@@ -21,15 +8,14 @@ Material:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_Name: Portal
-  m_Shader: {fileID: 4800000, guid: 933532a4fcc9baf4fa0491de14d08ed7, type: 3}
+  m_Shader: {fileID: 4800000, guid: 732968a50c15e194ba1e39cf62976ac1, type: 3}
   m_ValidKeywords: []
   m_InvalidKeywords: []
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
   m_CustomRenderQueue: -1
-  stringTagMap:
-    RenderType: Opaque
+  stringTagMap: {}
   disabledShaderPasses: []
   m_SavedProperties:
     serializedVersion: 3
@@ -78,6 +64,10 @@ Material:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
+    - _Texture:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     - unity_Lightmaps:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
@@ -94,6 +84,7 @@ Material:
     m_Floats:
     - _AlphaClip: 0
     - _Blend: 0
+    - _BlendOp: 0
     - _BumpScale: 1
     - _ClearCoatMask: 0
     - _ClearCoatSmoothness: 0
@@ -111,6 +102,7 @@ Material:
     - _Parallax: 0.005
     - _QueueOffset: 0
     - _ReceiveShadows: 1
+    - _SampleGI: 0
     - _Smoothness: 0.5
     - _SmoothnessTextureChannel: 0
     - _SpecularHighlights: 1
@@ -119,8 +111,21 @@ Material:
     - _WorkflowMode: 1
     - _ZWrite: 1
     m_Colors:
-    - _BaseColor: {r: 1, g: 0, b: 1, a: 1}
-    - _Color: {r: 1, g: 0, b: 1, a: 1}
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
+    - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
     - _SpecColor: {r: 0.19999996, g: 0.19999996, b: 0.19999996, a: 1}
   m_BuildTextureStacks: []
+--- !u!114 &8905466428277890777
+MonoBehaviour:
+  m_ObjectHideFlags: 11
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: d0353a89b1f911e48b9e16bdc9f2e058, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  version: 5

Assets/Escape Room Engine/Portal/Portal.prefab

@@ -31,6 +31,7 @@ Transform:
   m_Children:
   - {fileID: 8885472774183339771}
   - {fileID: 2398425302420252226}
+  - {fileID: 2168933888955393262}
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
@@ -47,7 +48,9 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   other: {fileID: 0}
-  portalCamera: {fileID: 2398425302420252226}
+  playerCamera: {fileID: 0}
+  portalCamera: {fileID: 7791795762741173939}
+  portalQuad: {fileID: 6216133567950691622}
 --- !u!1 &6911937082098131204
 GameObject:
   m_ObjectHideFlags: 0
@@ -59,9 +62,8 @@ GameObject:
   - component: {fileID: 8885472774183339771}
   - component: {fileID: 1178153191156473883}
   - component: {fileID: 6216133567950691622}
-  - component: {fileID: 8624812738712999080}
   m_Layer: 0
-  m_Name: Portal Plane
+  m_Name: Quad
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
@@ -132,20 +134,6 @@ MeshRenderer:
   m_SortingLayer: 0
   m_SortingOrder: 0
   m_AdditionalVertexStreams: {fileID: 0}
---- !u!64 &8624812738712999080
-MeshCollider:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 6911937082098131204}
-  m_Material: {fileID: 0}
-  m_IsTrigger: 0
-  m_Enabled: 1
-  serializedVersion: 4
-  m_Convex: 0
-  m_CookingOptions: 30
-  m_Mesh: {fileID: 10210, guid: 0000000000000000e000000000000000, type: 0}
 --- !u!1 &7398326895463990628
 GameObject:
   m_ObjectHideFlags: 0
@@ -186,7 +174,7 @@ Camera:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 7398326895463990628}
-  m_Enabled: 1
+  m_Enabled: 0
   serializedVersion: 2
   m_ClearFlags: 1
   m_BackGroundColor: {r: 0.19215687, g: 0.3019608, b: 0.4745098, a: 0}
@@ -255,3 +243,78 @@ MonoBehaviour:
   m_RequiresDepthTexture: 0
   m_RequiresColorTexture: 0
   m_Version: 2
+--- !u!1001 &1842852527293547269
+PrefabInstance:
+  m_ObjectHideFlags: 0
+  serializedVersion: 2
+  m_Modification:
+    m_TransformParent: {fileID: 2246995198243242195}
+    m_Modifications:
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_RootOrder
+      value: 2
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalPosition.x
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalPosition.y
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalPosition.z
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalRotation.w
+      value: 0.0000031292439
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalRotation.x
+      value: -0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalRotation.y
+      value: -1
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalRotation.z
+      value: -0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalEulerAnglesHint.x
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalEulerAnglesHint.y
+      value: -180
+      objectReference: {fileID: 0}
+    - target: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_LocalEulerAnglesHint.z
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 919132149155446097, guid: a2052daf99b37934fb434aaffa9e75f2,
+        type: 3}
+      propertyPath: m_Name
+      value: Portal Frame
+      objectReference: {fileID: 0}
+    m_RemovedComponents: []
+  m_SourcePrefab: {fileID: 100100000, guid: a2052daf99b37934fb434aaffa9e75f2, type: 3}
+--- !u!4 &2168933888955393262 stripped
+Transform:
+  m_CorrespondingSourceObject: {fileID: -8679921383154817045, guid: a2052daf99b37934fb434aaffa9e75f2,
+    type: 3}
+  m_PrefabInstance: {fileID: 1842852527293547269}
+  m_PrefabAsset: {fileID: 0}

Assets/Escape Room Engine/Portal/PortalShader.shader

@@ -0,0 +1,55 @@
+Shader "Escape Room Engine/Portal"
+{
+    Properties
+    {
+        _MainTex("Portal Texture", 2D) = "" {}
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" "Queue" = "Geometry" }
+
+        Pass
+        {
+            // stencil the portal surface to cut it out from the portal frame
+            Stencil
+            {
+                Ref 1
+                Pass replace
+            }
+            
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            uniform sampler2D _MainTex;
+
+            struct Attributes
+            {
+                float4 vertex : POSITION;
+            };
+
+            struct Varyings
+            {
+                float4 vertex : SV_POSITION;
+                float4 screen : TEXCOORD0;
+            };
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                OUT.vertex = TransformObjectToHClip(IN.vertex.xyz);
+                OUT.screen = ComputeScreenPos(OUT.vertex);
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                return tex2D(_MainTex, IN.screen.xy / IN.screen.w);
+            }
+            ENDHLSL
+        }
+    }
+}

Assets/Escape Room Engine/Portal/PortalShader.shader.meta

@@ -0,0 +1,10 @@
+fileFormatVersion: 2
+guid: 732968a50c15e194ba1e39cf62976ac1
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  preprocessorOverride: 0
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: