[IGSTK-Users] Needle object disappers during tracking

[Fucang Jia]

Hi Patrick,

I try the code you revised and it works very well! Thanks a lot!

Fucang
  



On 2006-08-04 16:08:41 Patrick Cheng
Subject:    Re: [IGSTK-Users] Needle object disappers during tracking

Hi  Fucang,

Thank  you  again  for  the  detail3e  report  on  this.

This  is  a  known  issue  has  to  do  with  the  igstkObjectRepresentation
internal  state  machine  transition  table.  There  were  discussions  on
whether  to  simplify  the  state  machine  of  this  class  or  not.  Our  chief
architect  Luis  Ibanez  is  working  on  adding  a  complete  regression  test  to
verify  and  fix  this  problem,  this  is  also  the  best  way  to  do  the
extensive  testing.

Luis  is  quite  busy  all  the  time,  I  hope  he  can  give  us  some  update  on
this  soon.

For  right  now,  in  my  local  copy,  I  put  fixes  to  get  around  the  buggy
performance  of  the  class  to  get  the  application  working.

Please  try  the  code  attached.

Thank  you,

Patrick

Fucang  Jia  wrote:
>  Hi,  Patrick,
>    
>  I  am  using  NeedleBiopsy  app  to  do  tracking.  At  first,  the  needle  and  the  
>  tip  of
>  the  needle  display  100ms  then  disappear.  When  I  change  the  line  80  in  
>  NeedleBiopsy.cxx
>  transform.SetToIdentity(  100  );
>  to
>  transform.SetToIdentity(  1e300  );
>    
>  The  needle  and  tip  display  well.
>    
>  But  the  needle  and  the  tip  will  disappear  forever  in  three  conditions:
>    
>  1.  During  tracking  by  Vicra,  if  the  passive  sphere  marker  was  blocked,  
>  then  the  transform  can  not
>  get,  then  the  needle  and  the  tip  will  disapper,  even  though  the  passive  
>  sphere  can  be  seen
>  from  the  Vicra  again.
>    
>  2.  During  tracking,  if  the  3D  scene  was  adjusted  by  mouse,  then  the  
>  needle  and  the  tip  will
>  disappear  in  a  moment.
>    
>  3.  When  press  the  "Stop"  button,  then  press  the  "Tracking"  button,  the  
>  needle
>  and  the  tip  will  not  display.
>    
>  Could  you  give  any  hints  to  solve  this  problem?
>    
>  Thank  you!
>    
>  Fucang
>    
>    
>    
>  
>  
>  ------------------------------------------------------------------------
>  
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