Positioning with spine posture prediction

1. Import the GHBM model using the GHBMC_M50_v4-1-1_description_LSDyna.pmr and GHBMC_M50-O_Main.dyn files (see Project menu)
2. In the module parameters (Module parameters), set bone collision off for Physics based Positioning
3. Start the Positioning module and do some spine positioning using the physiological spine predictor :
   • Fix both legs (Fixed bone controller)
   • Enable the Spine predictor from the secModulePhysPosiInterPredictors
   • For source posture select Seating erect, for target select Forward flexed, keep posture value to 0, keep align on gravity on and Update
   • Set time step to 0.01, run the positioning until it is stable, if necessary reduce the simulation time-step (Simulation control)
   • It is then advised to run several iterative predictions by gradually increasing and updating the stiffness of the spine/pelvis frame attractors until the solution is stable. This is in particular required to update the absolute orientation of the spine precisely when the 'Align on gravity' option is on
4. You should get something similar to the following screenshot:
   

   Spine posture predictor on GHBM model, fixed bones, and automatically added pelvis orientation controller
5. Now let's do some more spine positioning :
   1. Be sure the simulation is stopped
   2. Fix the pelvis to keep its posture orientation
   3. Deactivate the Spine predictor
   4. Open the Spine controller, select C1, T1, T12 and L5 as spline control points
   5. Activate the mouse spine interactor
   6. Adjust the Display settings, align a view on the back of the GHBM to be confortable to edit the spline and give it a scoliosis shape, you can obtain some thing like :
      

      Scoliosis spine shape
   7. Run the positioning until it is stable, if necessary reduce the simulation time-step
      

      Scoliosis spine shape reached