Hello!

I tried to use trace function from superpatch and trace intersection
with mesh object, but superpatch gave access violation. I D/L SuperPatch
source code and rebuilt project and as it appears, problem is with
uninitialized mesh queue. 

Parse_Trace function calling results finally in calling function
intersect_bbox_tree (mesh.c): 
*************************************
static int intersect_bbox_tree(MESH *Mesh, RAY *Ray, RAY  *Orig_Ray, DBL
len, ISTACK *Depth_Stack)
{
  int i, found;
  DBL Best, Depth;
  RAYINFO rayinfo;
  BBOX_TREE *Node, *Root;

  /* Create the direction vectors for this ray. */

  Create_Rayinfo(Ray, &rayinfo);

  /* Start with an empty priority queue. */

  found = 0;

  Mesh_Queue->QSize = 0;
        /\
---------

But Mesh_Queue is initialized after parse (in function
Initialize_Mesh_Code) and null pointer exception occurs. I put
Initialize_Mesh_Code call before calling Parse (after Init_Blob_Queue)
in FrameRender function (povray.c)  and this seemed to fix this problem. 

Perhaps there is other uninitialized structures as well, which could
cause problems during this trace function, but at first sight I haven't
noticed such ones.

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