Fixed #2783

src/Math/babylon.math.ts

@@ -4415,51 +4415,75 @@
             return frustumPlanes;
         }
 
+        public static GetNearPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] + transform.m[2];
+            frustumPlane.normal.y = transform.m[7] + transform.m[6];
+            frustumPlane.normal.z = transform.m[11] + transform.m[10];
+            frustumPlane.d = transform.m[15] + transform.m[14];
+            frustumPlane.normalize();
+        }
+
+        public static GetFarPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] - transform.m[2];
+            frustumPlane.normal.y = transform.m[7] - transform.m[6];
+            frustumPlane.normal.z = transform.m[11] - transform.m[10];
+            frustumPlane.d = transform.m[15] - transform.m[14];
+            frustumPlane.normalize();
+        }
+
+        public static GetLeftPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] + transform.m[0];
+            frustumPlane.normal.y = transform.m[7] + transform.m[4];
+            frustumPlane.normal.z = transform.m[11] + transform.m[8];
+            frustumPlane.d = transform.m[15] + transform.m[12];
+            frustumPlane.normalize();
+        }       
+        
+        public static GetRightPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] - transform.m[0];
+            frustumPlane.normal.y = transform.m[7] - transform.m[4];
+            frustumPlane.normal.z = transform.m[11] - transform.m[8];
+            frustumPlane.d = transform.m[15] - transform.m[12];
+            frustumPlane.normalize();
+        }     
+        
+        public static GetTopPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] - transform.m[1];
+            frustumPlane.normal.y = transform.m[7] - transform.m[5];
+            frustumPlane.normal.z = transform.m[11] - transform.m[9];
+            frustumPlane.d = transform.m[15] - transform.m[13];
+            frustumPlane.normalize();
+        }      
+        
+        public static GetBottomPlaneToRef(transform: Matrix, frustumPlane: Plane): void {
+            frustumPlane.normal.x = transform.m[3] + transform.m[1];
+            frustumPlane.normal.y = transform.m[7] + transform.m[5];
+            frustumPlane.normal.z = transform.m[11] + transform.m[9];
+            frustumPlane.d = transform.m[15] + transform.m[13];
+            frustumPlane.normalize();
+        }           
+
         /**
          * Sets the passed array "frustumPlanes" with the 6 Frustum planes computed by the passed transformation matrix.  
          */
         public static GetPlanesToRef(transform: Matrix, frustumPlanes: Plane[]): void {
             // Near
-            frustumPlanes[0].normal.x = transform.m[3] + transform.m[2];
-            frustumPlanes[0].normal.y = transform.m[7] + transform.m[6];
-            frustumPlanes[0].normal.z = transform.m[11] + transform.m[10];
-            frustumPlanes[0].d = transform.m[15] + transform.m[14];
-            frustumPlanes[0].normalize();
+            Frustum.GetNearPlaneToRef(transform, frustumPlanes[0]);
 
             // Far
-            frustumPlanes[1].normal.x = transform.m[3] - transform.m[2];
-            frustumPlanes[1].normal.y = transform.m[7] - transform.m[6];
-            frustumPlanes[1].normal.z = transform.m[11] - transform.m[10];
-            frustumPlanes[1].d = transform.m[15] - transform.m[14];
-            frustumPlanes[1].normalize();
+            Frustum.GetFarPlaneToRef(transform, frustumPlanes[1]);
 
             // Left
-            frustumPlanes[2].normal.x = transform.m[3] + transform.m[0];
-            frustumPlanes[2].normal.y = transform.m[7] + transform.m[4];
-            frustumPlanes[2].normal.z = transform.m[11] + transform.m[8];
-            frustumPlanes[2].d = transform.m[15] + transform.m[12];
-            frustumPlanes[2].normalize();
+            Frustum.GetLeftPlaneToRef(transform, frustumPlanes[2]);
 
             // Right
-            frustumPlanes[3].normal.x = transform.m[3] - transform.m[0];
-            frustumPlanes[3].normal.y = transform.m[7] - transform.m[4];
-            frustumPlanes[3].normal.z = transform.m[11] - transform.m[8];
-            frustumPlanes[3].d = transform.m[15] - transform.m[12];
-            frustumPlanes[3].normalize();
+            Frustum.GetRightPlaneToRef(transform, frustumPlanes[3]);
 
             // Top
-            frustumPlanes[4].normal.x = transform.m[3] - transform.m[1];
-            frustumPlanes[4].normal.y = transform.m[7] - transform.m[5];
-            frustumPlanes[4].normal.z = transform.m[11] - transform.m[9];
-            frustumPlanes[4].d = transform.m[15] - transform.m[13];
-            frustumPlanes[4].normalize();
+            Frustum.GetTopPlaneToRef(transform, frustumPlanes[4]);
 
             // Bottom
-            frustumPlanes[5].normal.x = transform.m[3] + transform.m[1];
-            frustumPlanes[5].normal.y = transform.m[7] + transform.m[5];
-            frustumPlanes[5].normal.z = transform.m[11] + transform.m[9];
-            frustumPlanes[5].d = transform.m[15] + transform.m[13];
-            frustumPlanes[5].normalize();
+            Frustum.GetBottomPlaneToRef(transform, frustumPlanes[5]);
         }
     }
 

src/babylon.scene.ts

@@ -1916,6 +1916,12 @@
                 Frustum.GetPlanesToRef(this._transformMatrix, this._frustumPlanes);
             }
 
+            if (this.activeCamera._alternateCamera) {
+                let otherCamera = this.activeCamera._alternateCamera;
+                otherCamera.getViewMatrix().multiplyToRef(otherCamera.getProjectionMatrix(), Tmp.Matrix[0]);
+                Frustum.GetRightPlaneToRef(Tmp.Matrix[0], this._frustumPlanes[3]); // Replace right plane by second camera right plane
+            }
+
             if (this._sceneUbo.useUbo) {
                 this._sceneUbo.updateMatrix("viewProjection", this._transformMatrix);
                 this._sceneUbo.updateMatrix("view", this._viewMatrix);