BulletSim: fix possible race condition where an prim's asset can be requested quicker than the asset fetcher returns and thus falsely reporting that an asset was not fetched and defaulting the assset to a bounding box.

OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs

@@ -86,7 +86,7 @@ public abstract class BSPhysObject : PhysicsActor
         PhysBody = new BulletBody(localID);
         PhysShape = new BulletShape();
 
-        LastAssetBuildFailed = false;
+        PrimAssetState = PrimAssetCondition.Unknown;
 
         // Default material type. Also sets Friction, Restitution and Density.
         SetMaterial((int)MaterialAttributes.Material.Wood);
@@ -133,9 +133,13 @@ public abstract class BSPhysObject : PhysicsActor
     // Reference to the physical shape (btCollisionShape) of this object
     public BulletShape PhysShape;
 
-    // 'true' if the mesh's underlying asset failed to build.
-    // This will keep us from looping after the first time the build failed.
-    public bool LastAssetBuildFailed { get; set; }
+    // The physical representation of the prim might require an asset fetch.
+    // The asset state is first 'Unknown' then 'Waiting' then either 'Failed' or 'Fetched'.
+    public enum PrimAssetCondition
+    {
+        Unknown, Waiting, Failed, Fetched
+    }
+    public PrimAssetCondition PrimAssetState { get; set; }
 
     // The objects base shape information. Null if not a prim type shape.
     public PrimitiveBaseShape BaseShape { get; protected set; }