Problem 1396

When running in check mode in a complex geometry, the following problem is reported

Solid gave DistanceToIn = 0 yet returns -kInside- for this point !


-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1001
      issued by : G4VoxelNavigation::ComputeStep()
 Conflicting response from Solid  at the projected *intersection* point with the solid: 
   Inaccurate solid DistanceToIn for solid E5AL
      Original position (-7.671422800142409,-58.39097619339464,-56.72023453210477) 
           and direction (0.9482351604406044,0.2933922475180894,-0.1215362892327454)
      Original distance to surface (Step): 0
   Solid gave DistanceToIn = 0 yet returns -kInside- for this point !
   Details of location and Solid:  
      Point = (-7.671422800142409,-58.39097619339464,-56.72023453210477)
      Safety and distance values (from this intersection point): 
          Safety   (from inside):  DistanceToOut(p) = 15.48346644107644
          Distance (from inside):  DistanceToOut(p,v)= 32.43837579867777
      Solid type: G4Trap. 
Parameters of this solid are: 
-----------------------------------------------------------
    *** Dump for solid - E5AL ***
    ===================================================
 Solid type: G4Trap
 Parameters: 
    half length Z: 126.495 mm 
    half length Y of face -fDz: 60.049 mm 
    half length X of side -fDy1, face -fDz: 21.939 mm 
    half length X of side +fDy1, face -fDz: 21.939 mm 
    half length Y of face +fDz: 71.598 mm 
    half length X of side -fDy2, face +fDz: 26.355 mm 
    half length X of side +fDy2, face +fDz: 26.355 mm 
    std::tan(theta)*std::cos(phi): 0.0003145748193832724 degrees 
    std::tan(theta)*std::sin(phi): 20.18343727892806 degrees 
    std::tan(alpha), -fDz: 0 degrees 
    std::tan(alpha), +fDz: 0 degrees 
    trap side plane equations:
        0 X + -0.956067407783281 Y + 0.2931469115896627 Z + -62.93170301622281 = 0
        0 X + 0.9291424254719876 Y + -0.3697219944607462 Z + -61.15940644305538 = 0
        -0.9998477879592079 X + 0 Y + -0.01744708895715516 Z + -24.14332453585099 = 0
        0.9998475963754998 X + 0 Y + -0.01745806467324904 Z + -24.1433199096792 = 0
-----------------------------------------------------------


*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

Dear John,
By looking into the solid definition I found that given point is really Inside.
Values of DistanceToOut(p)=15.48 and DistanceToOut(p,v)=32.44 confirm this.
For the point, situated Inside, it is normal, that DistanceToIn replay 0.
This problem seems to be more navigation problem, that solid problem. 

Best Regards,
Tatiana.

Dear John,
The given point is really Inside of G4Trap, in this case DistanceToIn returns 0.
This problem seems to be a problem of G4Naviagator.
May be tested geometry has overlaps?

Best Regards,
Tatiana.

Since it appears the problem is not in G4Trap I am closing it.