|= (Pipe Equals) ?

What is that? It's used in this script that Joachim Ante wrote.

Code (csharp):

1. // Storage for all active visibility culling areas
2. static var areas = ArrayList();
3. var alwaysEnabledLayers : LayerMask = 1;
4. function OnPreCull () {
5.     // Calculate the culling mask
6.     // Go through all areas and take the union of all visible layers
7.     var layerMask = 0;
8.     var cameraPos = transform.position;
9.     for (var area : VisibilityCullingArea in areas)
10.     {
11.         var areaTransform : Transform = area.transform;
12.         var relative = areaTransform.InverseTransformPoint(cameraPos);
13.         var bounds = new Bounds (Vector3.zero, transform.localScale);
14.         if (bounds.Contains(relative))
15.         {
16.             layerMask |= area.visibleLayers.value;
17.         }
18.     }
19.    
20.     // If we are not in a visibility area. We render everything
21.     layerMask |= alwaysEnabledLayers.value;
22.  
23.     camera.cullingMask = layerMask;
24. }

 

I believe it is a binary operator. The | operator computes the bitwise or logical OR of its operands depending on if the types are integral or boolean.

Bitwise OR is:

Code (csharp):

1.  
2.    0101
3. OR 0011
4. =  0111
5.  

In this case, it makes a lot of sense for the masks.

 

is also useful (distinct from ).

Code (csharp):

1.     0101
2. AND 0011
3. =   0001

--Eric

 

I took a class in discrete logic about 8 years ago, and remember a smattering of what I learned there, so I understand what is going on in your equations. Thanks for the info. However, the class didn't actually involve computers, just logic theory, so I don't know when I might find these operators useful.

 

if you want to store 8 binary states in a single byte for example to be used in a network viewed environment.