The 3D drawing is complicated by the fact that we can use multiple pass in the algorithm to draw a complete geometry.  Indeed if a 3D geometry contain to many lines or polygons to be displayed in real time, we will only draw a portion of these and come back to finish later on if the user has not interact with the 3D window.  The maximum number of passes needed to draw the geometry is controlled by the Speed parameter in the configuration menu.

 

 

 

Start of 3D Drawing

 

if the Flag_Redraw contain the bit REDRAW_3D_START:

          set "Step_Flag" to Flag_Redraw minus the REDRAW_3D_START bit

          set "Step_Current" to 0

          set "Step_Total" to the maximum number for this graphic card

 

// --- Loop for all windows ---

for all 3D windows that are "on" and need a redraw

 

          Prepare the OpenGL context

 

          // --- Draw_Clear ---

          If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_WINDOW

                    Call Draw() for all modules that registered that bit

 

 

          if the Flag_Redraw contain the bit REDRAW_3D_START

                    Clear the OpenGL window

 

 

          // --- Draw_Camera ---

          If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_CAMERA

                    Call Draw() for all modules that registered that bit

 

          // --- Draw_Light ---

          If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_LIGHT

                    Call Draw() for all modules that registered that bit

 

          // --- Draw_Transfo ---

          If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_TRANSFO

                    Call Draw() for all modules that registered that bit

 

 

          if the Flag_Redraw contain the bit REDRAW_3D_START

                    // --- Draw_Transfo ---

                    If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_PRE

                              Call Draw() for all modules that registered that bit

 

          // --- Database callback ---

          if the Step_Flag contain one of the bits of REDRAW_MASK_3D_DB

                    for all the structures in the DB, call the Draw_3D callback for this step

 

          // --- Geometries callback ---

          For all the existing "TAG" geometries (created from the TAG data in sliceO)

                    Call all the associated "Draw_Geom" callback functions

                    If none of the callback returned "2", call the default callback function for this step

 

          For all the existing "File" geometries (read as 3D file)

                    Call all the associated "Draw_Geom" callback functions

                    If none of the callback returned "2", call the default callback function for this step

 

          // --- Module's Draw functions ---

          If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_DLL

                    Call Draw() for all modules that registered that bit with the current step number

 

          If this is the last step in the 3D redraw (Step_Current = Step_Total-1)

                    // --- Draw Post ---

                    If the Flag_Redraw contain one of the bits in REDRAW_MASK_3D_POST

                              Call Draw() for all modules that registered that bit

 

          Exit the OpenGL Context

 

Increment Step_Current

Clear the bit REDRAW_3D_START from Flag_Draw

 

If this is the last step (Step_Current = Step_Total)

          Clear Flag_Draw

 

End of 3D Drawing