[IGSTK-Users] Needle object disappers during tracking

[Fucang Jia]

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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