Added layer masks to separate game and view model, and added a secondary overlay camera to render the view model separately after the main pass. Fixes gun view model clipping into walls.

Assets/Scenes/Default.unity

@@ -153,6 +153,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 941b1c44c09860d4fa2547fa7c914d55, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  mainCamera: {fileID: 963194227}
   visualStyles:
   - {fileID: 11400000, guid: d187fe54fb9a3e047bf4cec083877e72, type: 2}
 --- !u!4 &157597865
@@ -169,6 +170,122 @@ Transform:
   m_Father: {fileID: 0}
   m_RootOrder: 2
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!1 &567286279
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 567286283}
+  - component: {fileID: 567286282}
+  - component: {fileID: 567286281}
+  - component: {fileID: 567286280}
+  m_Layer: 0
+  m_Name: View Camera
+  m_TagString: MainCamera
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &567286280
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 567286279}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: a79441f348de89743a2939f4d699eac1, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_RenderShadows: 1
+  m_RequiresDepthTextureOption: 2
+  m_RequiresOpaqueTextureOption: 2
+  m_CameraType: 1
+  m_Cameras: []
+  m_RendererIndex: -1
+  m_VolumeLayerMask:
+    serializedVersion: 2
+    m_Bits: 1
+  m_VolumeTrigger: {fileID: 0}
+  m_RenderPostProcessing: 0
+  m_Antialiasing: 0
+  m_AntialiasingQuality: 2
+  m_StopNaN: 0
+  m_Dithering: 0
+  m_ClearDepth: 1
+  m_AllowXRRendering: 1
+  m_RequiresDepthTexture: 0
+  m_RequiresColorTexture: 0
+  m_Version: 2
+--- !u!81 &567286281
+AudioListener:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 567286279}
+  m_Enabled: 1
+--- !u!20 &567286282
+Camera:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 567286279}
+  m_Enabled: 1
+  serializedVersion: 2
+  m_ClearFlags: 1
+  m_BackGroundColor: {r: 0.19215687, g: 0.3019608, b: 0.4745098, a: 0}
+  m_projectionMatrixMode: 1
+  m_GateFitMode: 2
+  m_FOVAxisMode: 0
+  m_SensorSize: {x: 36, y: 24}
+  m_LensShift: {x: 0, y: 0}
+  m_FocalLength: 50
+  m_NormalizedViewPortRect:
+    serializedVersion: 2
+    x: 0
+    y: 0
+    width: 1
+    height: 1
+  near clip plane: 4
+  far clip plane: 16384
+  field of view: 70
+  orthographic: 0
+  orthographic size: 5
+  m_Depth: -1
+  m_CullingMask:
+    serializedVersion: 2
+    m_Bits: 128
+  m_RenderingPath: -1
+  m_TargetTexture: {fileID: 0}
+  m_TargetDisplay: 0
+  m_TargetEye: 3
+  m_HDR: 1
+  m_AllowMSAA: 1
+  m_AllowDynamicResolution: 0
+  m_ForceIntoRT: 0
+  m_OcclusionCulling: 0
+  m_StereoConvergence: 10
+  m_StereoSeparation: 0.022
+--- !u!4 &567286283
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 567286279}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_Children: []
+  m_Father: {fileID: 963194228}
+  m_RootOrder: 0
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &705507993
 GameObject:
   m_ObjectHideFlags: 0
@@ -314,13 +431,13 @@ Camera:
     height: 1
   near clip plane: 4
   far clip plane: 16384
-  field of view: 60
+  field of view: 70
   orthographic: 0
   orthographic size: 5
   m_Depth: -1
   m_CullingMask:
     serializedVersion: 2
-    m_Bits: 4294967295
+    m_Bits: 64
   m_RenderingPath: -1
   m_TargetTexture: {fileID: 0}
   m_TargetDisplay: 0
@@ -342,7 +459,8 @@ Transform:
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
   m_LocalPosition: {x: 0, y: 250, z: -2500}
   m_LocalScale: {x: 1, y: 1, z: 1}
-  m_Children: []
+  m_Children:
+  - {fileID: 567286283}
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
@@ -362,7 +480,8 @@ MonoBehaviour:
   m_RequiresDepthTextureOption: 2
   m_RequiresOpaqueTextureOption: 2
   m_CameraType: 0
-  m_Cameras: []
+  m_Cameras:
+  - {fileID: 567286282}
   m_RendererIndex: -1
   m_VolumeLayerMask:
     serializedVersion: 2

Assets/Scripts/Bootstrap.cs

@@ -10,6 +10,9 @@ public class Bootstrap : MonoBehaviour
 
     private UniQuake uq;
 
+    [SerializeField]
+    private Camera mainCamera;
+    
     [SerializeField]
     private List<VisualStyle> visualStyles = new List<VisualStyle>();
     
@@ -26,7 +29,7 @@ public class Bootstrap : MonoBehaviour
             uq.BaseGame = MissionPack.Quake;
             uq.ModDirectory = mod;
             uq.AdditionalArguments = ParseArgs();
-            uq.Camera = Camera.main;    // This can be any one of four cameras for split-screen, each with its own culling layer
+            uq.Camera = mainCamera;    // This can be any one of four cameras for split-screen, each with its own culling layer
             uq.SetVisualStyle(visualStyles[0]);
         }
         
@@ -36,7 +39,7 @@ public class Bootstrap : MonoBehaviour
             uq.BaseGame = MissionPack.Hipnotic;
             uq.ModDirectory = mod;
             uq.AdditionalArguments = ParseArgs();
-            uq.Camera = Camera.main;
+            uq.Camera = mainCamera;
             uq.SetVisualStyle(visualStyles[0]);
         }
         
@@ -46,7 +49,7 @@ public class Bootstrap : MonoBehaviour
             uq.BaseGame = MissionPack.Rogue;
             uq.ModDirectory = mod;
             uq.AdditionalArguments = ParseArgs();
-            uq.Camera = Camera.main;
+            uq.Camera = mainCamera;
             uq.SetVisualStyle(visualStyles[0]);
         }
 

Assets/Scripts/Game/Entity.cs

@@ -28,7 +28,10 @@ public class Entity
 
     private void CreateGameObject()
     {
-        gameObject = new GameObject($"Entity_{entityNum}");
+        gameObject = new GameObject($"Entity_{entityNum}")
+        {
+            layer = entityNum == 0 ? (int)Layers.View1 : (int)Layers.Game1
+        };
         
         skinnedMeshRenderer = gameObject.AddComponent<SkinnedMeshRenderer>();
         skinnedMeshRenderer.enabled = false;

Assets/Scripts/Game/GameState.cs

@@ -27,7 +27,7 @@ public class GameState
         Destroy();
         Resources.UnloadUnusedAssets();
         
-        worldGameObject = new GameObject(worldModel.Name);
+        worldGameObject = new GameObject(worldModel.Name) { layer = (int)Layers.Game1 };
 
         // The first sub-model contains all of the static geometry
         var subModel = worldModel.GetSubModel(0);
@@ -37,11 +37,11 @@ public class GameState
 
     private GameObject CreateBrushGameObject(BrushModel.SubModel subModel)
     {
-        var subModelGO = new GameObject(subModel.Name);
+        var subModelGO = new GameObject(subModel.Name) { layer = (int)Layers.Game1 };
         
         foreach (var surfaceMesh in subModel.SurfaceMeshes)
         {
-            var meshGO = new GameObject(surfaceMesh.Mesh.name);
+            var meshGO = new GameObject(surfaceMesh.Mesh.name) { layer = (int)Layers.Game1 };
             meshGO.transform.SetParent(subModelGO.transform);
 
             var mf = meshGO.AddComponent<MeshFilter>();
@@ -107,7 +107,7 @@ public class GameState
             return;
         }
 
-        var brushModelGO = new GameObject(brushModel.Name);
+        var brushModelGO = new GameObject(brushModel.Name) { layer = (int)Layers.Game1 };
         for (int i = 0; i < brushModel.SubModelCount; ++i)
         {
             var subModelGO = CreateBrushGameObject(brushModel.GetSubModel(i));

Assets/Scripts/Layers.cs

@@ -0,0 +1,13 @@
+public enum Layers
+{
+    Game1 = 6,
+    View1 = 7,
+}
+
+public static class LayerExtensions
+{
+    public static int ToLayerMask(this Layers layer)
+    {
+        return 1 << (int)layer;
+    }
+}

ProjectSettings/TagManager.asset

@@ -11,8 +11,8 @@ TagManager:
   - 
   - Water
   - UI
-  - 
-  - 
+  - Game1
+  - ViewModel1
   - 
   - 
   -