3dprinting/LuaLibs/CalcSlices.lua

-- CalcSlices.lua by Egaltech s.r.l. 2022/10/12
-- Calcolo percorsi di lavoro per Stampa 3d

-- Tabella per definizione modulo
local CalcSlices = {}

-- Intestazioni
require( 'EgtBase')

EgtOutLog( ' CalcSlices started', 1)

-- Dati
local AMD = require( 'AddManData')

---------------------------------------------------------------------
local s_nPartId

---------------------------------------------------------------------
local function ComputeZSlices( dSliceStep, dZmin, dDeltaZ, dZmax)
   
   local ptSlices = { dZmin + dDeltaZ}
   local dPosZ = dZmin + dSliceStep
   while dPosZ < dZmax do
      table.insert( ptSlices, dPosZ)
      dPosZ = dPosZ + dSliceStep
   end 
   return ptSlices
end

--------------------------------------------------------------------
local function ComputeMaxH( vIds, frSlicing, HMax, dSliceStep)
   
   -- calcolo il box globale
   local b3BoxGlob = BBox3d()
   for i = 1, #vIds do
      local b3Box = EgtGetBBoxGlob( vIds[i], GDB_BB.STANDARD)
      b3BoxGlob:Add( b3Box)
   end
   
   if b3BoxGlob:getMax():getZ() < b3BoxGlob:getMin():getZ() + HMax + GEO.EPS_SMALL then
      return GEO.INFINITO
   end
   
   if AreSameVectorApprox( frSlicing:getVersZ(), Z_AX()) then
      return HMax
   else   
      -- se slicing inclinato
      local nGrpTmp = EgtGroup( s_nPartId)
      for i = 1, #vIds do
         EgtPlaneSurfTmInters( Point3d( 0, 0, HMax), Z_AX(), vIds[i], nGrpTmp, GDB_RT.GLOB)
      end
      local b3Box = EgtGetBBoxGlob( nGrpTmp, GDB_BB.STANDARD)
      EgtErase( nGrpTmp)
      if not b3Box then
         return GEO.INFINITO
      end
      local ptMin = b3Box:getMin()
      local ptMax = b3Box:getMax()
      -- la quota dell'ultimo slice è più bassa di dSliceStep rispetto alla quota dell'ultimo toolpath
      -- ( andrebbe anche considerata dCorrZ)
      ptMin = ptMin - dSliceStep * frSlicing:getVersZ()
      ptMax = ptMax - dSliceStep * frSlicing:getVersZ()
      ptMin:toLoc( frSlicing)
      ptMax:toLoc( frSlicing)
      
      return min( ptMin:getZ(), ptMax:getZ())
   end
   
   return GEO.INFINITO
end

--------------------------------------------------------------------
local function AdjustAuxSolids( nSolidsLay)
   
   -- gestisce intersezioni fra solidi ausiliari unendoli
   local nCurr = EgtGetFirstInGroup( nSolidsLay or GDB_ID.NULL)
   if not nCurr then return end
   
   local nGrpTmp = EgtGroup( nSolidsLay)
   while nCurr do
      if EgtGetType( nCurr) == GDB_TY.SRF_MESH then 
         -- verifico se interseca uno dei solidi successivi
         local bInters = true -- per entrare nel loop
         while bInters do
            bInters = false
            local nNext = EgtGetNext( nCurr)
            while nNext do
               if EgtGetType( nNext) == GDB_TY.SRF_MESH then
                  -- verifico se le due superfici si intersecano
                  local nFirst = EgtSurfTmSurfTmInters( nCurr, nNext, nGrpTmp)
                  -- se intersezione unisco i due solidi e ripeto il check
                  if nFirst then
                     EgtSurfTmAdd( nCurr, nNext)
                     EgtErase( nNext)
                     bInters = true
                  end
               end
               nNext = EgtGetNext( nNext)
            end
         end
      end
      nCurr = EgtGetNext( nCurr)
   end
   EgtErase( nGrpTmp)
end

--------------------------------------------------------------------
local function ReadParam( nId, sKey, sType, defVal, table)
   -- verifico se info nell'oggetto specifico
   local info = EgtGetInfo( nId, sKey, sType)
   -- altrimenti recupero info dai parametri generali
   if info == nil then info = EgtGetInfo( s_nPartId, sKey, sType) end
   -- o assegno valore di default
   if info == nil then info = defVal end
   
   -- se presente, inserisco l'info nella tabella
   if table then table[sKey] = info end
   
   return info
end

--------------------------------------------------------------------
local function GetRibParams( nId)

   local RibParam = {}
   ReadParam( nId, KEY_RIBS_SHELLS_NBR, 'i', 0, RibParam)
   ReadParam( nId, KEY_RIBS_INVERT_DIR, 'b', false, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_IN_INVERT, 'b', false, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_IN_LEN, 'd', 0, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_OUT_INVERT, 'b', false, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_OUT_LEN, 'd', 0, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_OUT_COASTING, 'd', 0, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_OUT_WIPE, 'd', 0, RibParam)
   ReadParam( nId, KEY_RIBS_LEAD_OUT_WIPE_DIR, 'd', 0, RibParam)
   ReadParam( nId, KEY_RIBS_OVERLAP, 'i', 0, RibParam)
   ReadParam( nId, KEY_RIBS_LINK, 'b', false, RibParam)
   ReadParam( nId, KEY_RIBS_TYPE, 'i', RIB_TYPE.INTERNAL, RibParam)
   ReadParam( nId, KEY_RIBS_INVERT_STRAND_ORDER, 'b', false, RibParam)
  
   return RibParam
end

-------------------------------------------------------------------
local function GetShellNumberParams( nId)
   
   local ShellNumberParam = {}
   ReadParam( nId, KEY_SHELL_NBR_DIFF, 'i', 0, ShellNumberParam)
   ReadParam( nId, KEY_SHELL_NBR_COASTING, 'd', 0, ShellNumberParam)
   ReadParam( nId, KEY_SHELL_NBR_WIPE, 'd', 0, ShellNumberParam)
   ReadParam( nId, KEY_SHELL_NBR_WIPE_DIR, 'd', 0, ShellNumberParam)
   
   return ShellNumberParam
end

--------------------------------------------------------------------
local function GetAuxSolidsParams( nId)
   
   local AuxSolidsParam = {}
   ReadParam( nId, KEY_AUX_SOLIDS_OVERLAP, 'i', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_LINK_PARAM, 'd', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_SP_OFFSET, 'd', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_COASTING_LEN, 'd', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_WIPE_LEN, 'd', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_WIPE_DIR, 'd', 0, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_INFILL, 'i', INFILL_TYPE.NONE, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_PRINT_ORDER, 'i', PRINT_ORDER.EXT_INT, AuxSolidsParam)
   ReadParam( nId, KEY_AUX_SOLIDS_LINK_TYPE, 'i', LINK_TYPE.NONE, AuxSolidsParam)
  
   return AuxSolidsParam
end

--------------------------------------------------------------------
local function SlicingExtraObjects( vtSlicing, nLay, nType, sNameGrp, sName)
   
   -- recupero gli oggeti di cui fare slicing
   local vIds = EgtGetAllInGroup( nLay)
   if not vIds or #vIds == 0 then return end
   
   -- rimuovo gli indici che non corrispondono a trimesh
   local k = 1
   while k <= #vIds do
      local nType = EgtGetType( vIds[k])
      if nType ~= GDB_TY.SRF_MESH then
         table.remove( vIds, k)
      else
         k = k + 1
      end
   end
   if #vIds == 0 then return end
 
   -- recupero i parametri di ogni oggetto
   local tabParams = {}
   local vToBeDone = {}
   for i = 1, #vIds do
      local vParams = {}
      local bToBeDone = true
      if nType == TYPE.RIB then
         vParams = GetRibParams( vIds[i])
         if vParams[ KEY_RIBS_SHELLS_NBR] == 0 then bToBeDone = false end
      elseif nType == TYPE.EXTRA_SHELL then
         vParams = GetShellNumberParams( vIds[i])
         if vParams[KEY_SHELL_NBR_DIFF] == 0 then bToBeDone = false end
      elseif nType == TYPE.AUX_SOLID then
         vParams = GetAuxSolidsParams( vIds[i])
         if vParams[KEY_AUX_SOLIDS_INFILL] == INFILL_TYPE.NONE then bToBeDone = false end
      end
      table.insert( tabParams, vParams)
      table.insert( vToBeDone, bToBeDone)
   end

   local nLayId = EgtGetFirstNameInGroup( s_nPartId, SLICE_LAYER .. '*')
   while nLayId do
      -- recupero quota per slicing
      local dZ = EgtGetInfo( nLayId, KEY_SLICE_REAL_Z, 'd')
      local dDeltaZ = EgtGetInfo( nLayId, KEY_SLICE_DELTAZ, 'd')
      -- creo gruppo per le costolature
      local nGrp = EgtGroup( nLayId)
      EgtSetName( nGrp, sNameGrp)
      EgtSetStatus( nGrp, GDB_ST.OFF)

      for i = 1, #vIds do
         if vToBeDone[i] then
            -- slicing oggetto
            local nNewId, nPntCnt, nCrvCnt, nSrfCnt = EgtPlaneSurfTmInters( ORIG() + ( dZ + dDeltaZ) * vtSlicing, vtSlicing, vIds[i], nGrp, GDB_RT.GLOB, TOLER)
            
            -- verifico se necessario ricalcolo
            local dCorr = 0
            local bOpen = false
            if nType ~= TYPE.RIB and nNewId then
               for nId = nNewId + nPntCnt, nNewId + nPntCnt + nCrvCnt - 1 do
                  if not EgtCurveIsClosed( nId) then
                     bOpen = true
                     break
                  end
               end
            end

            if nSrfCnt > 0 or bOpen then
               -- elimino vecchio risultato
               for j = nNewId, nNewId + nPntCnt + nCrvCnt + nSrfCnt - 1 do
                  EgtErase( j)
               end
               dCorr = 0.01
               nNewId, nPntCnt, nCrvCnt, nSrfCnt = EgtPlaneSurfTmInters( ORIG() + ( dZ + dDeltaZ + dCorr) * vtSlicing, vtSlicing, vIds[i], nGrp, GDB_RT.GLOB, TOLER)
            end
            
            if nNewId then
               -- rimuovo punti
               for nId = nNewId, nNewId + nPntCnt -1 do
                  EgtErase( nId)
               end
               -- rinomino le curve, correggo di DeltaZ e assegno parametri
               for nId = nNewId + nPntCnt, nNewId + nPntCnt + nCrvCnt - 1 do
                  EgtSetName( nId, sName .. tostring( i))
                  EgtMove( nId, - ( dDeltaZ + dCorr) * vtSlicing)
                  for sKey, sVal in pairs( tabParams[i]) do
                     EgtSetInfo( nId, sKey, sVal)
                  end
               end
               -- rimuovo superfici
               for nId = nNewId + nPntCnt + nCrvCnt, nNewId + nPntCnt + nCrvCnt + nSrfCnt - 1 do
                  EgtErase( nId)
               end
            end
         end
      end

      -- verifico che il gruppo non sia vuoto
      if not EgtGetFirstInGroup( nGrp) then
         EgtErase( nGrp)
      end
      nLayId = EgtGetNextName( nLayId, SLICE_LAYER .. '*')
   end

   return true
end

---------------------------------------------------------------------
local function ValueInArray( vArr, nValue)
   for _, val in ipairs( vArr) do
      if val == nValue then
         return true
      end
   end
   return false
end

---------------------------------------------------------------------
local function SlicingNoSolid( nRibsLay, vZSlices, dDeltaZStart, dZmin, frSlicing, vErr)
   
   local vtSlicing = frSlicing:getVersZ()
   
   -- contatore per il calcolo delle intersezioni
   if EgtProcessEvents( 100, 0) == 1 then return false end

   -- creo i layer dello slicing
   for i = 1, #vZSlices do
      local nLayGrp = EgtGroup( s_nPartId)
      EgtSetName( nLayGrp, SLICE_LAYER .. tostring( i))
      
      local dDeltaZ = EgtIf( i == 1, dDeltaZStart, 0)
      local dPosZ = vZSlices[i]- dDeltaZ
      EgtSetInfo( nLayGrp, KEY_SLICE_Z, dPosZ - dZmin)
      EgtSetInfo( nLayGrp, KEY_SLICE_REAL_Z, dPosZ)
      EgtSetInfo( nLayGrp, KEY_SLICE_DELTAZ, dDeltaZ)
      EgtSetInfo( nLayGrp, KEY_SLICE_NBR, i)
      
      local nGrpCrv = EgtGroup( nLayGrp)
      EgtSetName( nGrpCrv, CONTOUR_GRP .. EgtNumToString( 0))
   end
   if EgtProcessEvents( EgtIf( PRINT, 100, 0) + 20, 0) == 1 then return false end
    
   -- slicing dei setti
   SlicingExtraObjects( vtSlicing, nRibsLay, TYPE.RIB, RIBS_GRP, RIBS_CRV)
   if EgtProcessEvents( EgtIf( PRINT, 100, 0) + 100, 0) == 1 then return false end
   
   return true
end

---------------------------------------------------------------------
local function SlicingWithSolid( nStmId, vZSlices, dDeltaZStart, dZmin, frSlicing, vErr)
      
   -- costanti
   local TOLER = 0.05 
   local MID_TOLER = 0.1
   local BIG_TOLER = 2.0
   local MIN_LEN = 20.0
   local MIN_AREA = 25.0

   local vtSlicing = frSlicing:getVersZ()
   
   -- calcolo delle intersezioni
   if EgtProcessEvents( 1, 0) == 1 then return false end
   local nLayId = EgtParPlanesSurfTmInters( ORIG(), vtSlicing, vZSlices, nStmId, s_nPartId, GDB_RT.GLOB, TOLER)
   if EgtProcessEvents( 100, 0) == 1 then return false end
   
   local vPrevCen = {}
   local nLayCnt = 1
   
   -- scorro i risultati dello slicing
   while nLayId do
      
      local dDeltaZ = EgtIf( nLayCnt == 1, dDeltaZStart, 0)
      local dPosZ = vZSlices[nLayCnt]- dDeltaZ
      EgtSetInfo( nLayId, KEY_SLICE_Z, dPosZ - dZmin)
      EgtSetInfo( nLayId, KEY_SLICE_REAL_Z, dPosZ)
      EgtSetInfo( nLayId, KEY_SLICE_NBR, nLayCnt)
      
      -- verifico se necessario ricalcolo
      local nId = EgtGetLastInGroup( nLayId)
      local bRecalc = not nId
      local vtRecalc
      local nRecalc = 0
      while nId and not bRecalc do
         local nType = EgtGetType( nId)
         if nType == GDB_TY.SRF_MESH then 
            bRecalc = true
            vtRecalc = EgtSurfTmFacetNormVersor( nId, 0)
         elseif nType == GDB_TY.GEO_POINT then
            bRecalc = true
         end 
         nId = EgtGetPrev( nId)
      end
      -- eseguo eventuale ricalcolo
      ::RECALC::
      if bRecalc then
         nRecalc = nRecalc + 1
         EgtEmptyGroup( nLayId)
         dDeltaZ = dDeltaZ + EgtIf( vtRecalc and vtRecalc:getZ() > 0, -0.01, 0.01)
         -- eseguo il ricalcolo solo a quella quota
         EgtPlaneSurfTmInters( ORIG() + ( dPosZ + dDeltaZ) * vtSlicing, vtSlicing, nStmId, nLayId, GDB_RT.GLOB, TOLER)
         EgtOutLog( 'Warning : Recalc at Lay'.. EgtNumToString( nLayCnt))
      end
      EgtSetInfo( nLayId, KEY_SLICE_DELTAZ, dDeltaZ)
   
      -- salvo i risultati nel layer
      local vClosedId = {}
      local vOpenId = {}
      nId = EgtGetFirstInGroup( nLayId)
      while nId do 
         if EgtGetType( nId) == GDB_TY.GEO_POINT or EgtGetType( nId) == GDB_TY.SRF_MESH then
            -- se punto o superficie lo elimino
            EgtErase( nId)
         else
            -- correggo eventuali spostamenti in Z
            if abs( dDeltaZ) > GEO.EPS_SMALL then 
               EgtMove( nId, - dDeltaZ * vtSlicing)
            end
            -- verifico presenza contorni aperti
            if EgtCurveIsClosed( nId) then
               table.insert( vClosedId, nId)
            else
               table.insert( vOpenId, nId)
            end
         end  
         
         nId = EgtGetNext( nId)
      end     
      
      -- se presenti percorsi aperti, provo a concatenarli
      if #vOpenId > 0 then
         local nRordId, nRordCnt = EgtCurveCompoByReorder( nLayId, vOpenId, ORIG(), true, GDB_RT.LOC, BIG_TOLER)
         if nRordId then
            vOpenId = {}
            for nId = nRordId, nRordId + nRordCnt - 1 do
               if EgtCurveIsClosed( nId) then
                  table.insert( vClosedId, nId)
               else
                  table.insert( vOpenId, nId)
               end
            end
         end
      end
      -- chiudo percorsi aperti praticamente chiusi ed elimino quelli troppo corti
      for i = #vOpenId, 1, -1 do
         local ptStart = EgtSP( vOpenId[i])
         local ptEnd = EgtEP( vOpenId[i])
         if EgtCurveLength( vOpenId[i]) < MIN_LEN then
            EgtErase( vOpenId[i])
            table.remove( vOpenId, i)
         elseif AreSamePointEpsilon( ptStart, ptEnd, BIG_TOLER) then
            local ptMid = ( ptStart + ptEnd) / 2
            EgtModifyCurveStartPoint( vOpenId[i], ptMid)
            EgtModifyCurveEndPoint( vOpenId[i], ptMid)
            table.insert( vClosedId, vOpenId[i])
            table.remove( vOpenId, i)
         end
      end
      local bAllClosed = ( #vOpenId == 0)
      -- elimino percorsi chiusi di area troppo piccola
      for i = #vClosedId, 1, -1 do
         local _, _, dArea = EgtCurveArea( vClosedId[i])
         if dArea and dArea < MIN_AREA then
            EgtErase( vClosedId[i])
            table.remove( vClosedId, i)
         end
      end
   
      -- se necessario e possibile, torno a ricalcolo
      if not bAllClosed and nRecalc < 2 then
         bRecalc = true
         goto RECALC
      end
   
      -- imposto dati ausiliari
      EgtSetName( nLayId, EgtIf( bAllClosed, '', '__') .. SLICE_LAYER .. EgtNumToString( nLayCnt))
      EgtSetInfo( nLayId, 'CrvCnt', #vClosedId + #vOpenId)
      EgtSetColor( vClosedId or {}, 'TEAL')
      EgtSetColor( vOpenId or {}, 'RED')
   
      -- creo flat region a partire dalle curve chiuse ottenute con lo slicing
      local nGrp = EgtGroup( nLayId, frSlicing, GDB_RT.GLOB)
      for i = 1, #vClosedId do
         EgtRelocateGlob( vClosedId[i], nGrp)
         EgtApproxCurve( vClosedId[i], GDB_CA.ARCS, MID_TOLER)
         EgtRelocateGlob( vClosedId[i], nLayId)
      end
      EgtErase( nGrp)
      local nSurfFR, nSrfNbr = EgtSurfFlatRegion( nLayId, vClosedId)
   
      if nSurfFR then
         -- verifico orientamento della normale
         local vtN = EgtSurfFrNormVersor( nSurfFR, GDB_ID.ROOT)
         if AreOppositeVectorApprox( vtN, vtSlicing) then
            EgtInvertSurf( nSurfFR)
         end
         -- elimino le curve originali
         for i = 1, #vClosedId do
            EgtErase( vClosedId[i])
         end
         -- esplodo in superfici elementari
         local vSrfId = {}
         for j = 1, nSrfNbr do
            local nCurrSfrId = nSurfFR + j - 1
            local nSfrId, nSfrCnt = EgtExplodeSurf( nCurrSfrId)
            for nId = nSfrId, nSfrId + nSfrCnt - 1 do
               table.insert( vSrfId, nId)
            end
         end
         -- calcolo i centri delle superfici
         local vCen = {}
         for j = 1, #vSrfId do
            local nId = vSrfId[j]
            local ptCen = EgtCP( nId, GDB_ID.ROOT)
            table.insert( vCen, ptCen)
         end
         -- ordino le superfici rispetto ai centri del layer precedente
         local vOrd = {}
         if #vPrevCen > 1 then
            for j = 1, #vPrevCen do
               local nMin = 0
               local dMinDist = GEO.INFINITO
               for k = 1, #vCen do
                  if not ValueInArray( vOrd, k) then
                     local dDist = dist( vPrevCen[j], vCen[k])
                     if dDist < dMinDist then
                        dMinDist = dDist
                        nMin = k
                     end
                  end
               end
               if nMin ~= 0 then
                  vOrd[j] = nMin
               end
            end
            -- se necessario, completo il vettore di ordine
            if #vOrd < #vSrfId then
               for j = 1, #vSrfId do
                  if not ValueInArray( vOrd, j) then
                     table.insert( vOrd, j)
                  end
               end
            end
         else
            EgtSpInit()
            for j = 1, #vSrfId do
               EgtSpAddPoint( vCen[j]:getX(), vCen[j]:getY())
            end
            vOrd = EgtSpCalculate( SHP_TY.OPEN)
            EgtSpTerminate()
            if not vOrd then
               for j = 1, #vSrfId do
                  vOrd[j] = j
               end
            end
         end
         -- salvo i nuovi centri
         for j = 1, #vSrfId do
            vPrevCen[j] = vCen[vOrd[j]]
         end
         -- creo i gruppi di percorsi
         for j = 1, #vSrfId do
            local nId = vSrfId[vOrd[j]]
            -- per ogni chunk creo un gruppo di percorsi 
            local nGrpCrv = EgtGroup( nLayId)
            EgtSetName( nGrpCrv, CONTOUR_GRP .. EgtNumToString( j, 1))
            EgtRelocateGlob( nId, nGrpCrv)
            EgtSetName( nId, LAYER_SRF)
            EgtSetStatus( nId, GDB_ST.OFF)
            -- estraggo i contorni della superficie
            local nCsId, nCsCnt = EgtExtractSurfFrChunkLoops( nId, 0, nGrpCrv) 
            for nId2 = nCsId, nCsId + nCsCnt - 1 do
               EgtSetName( nId2, OUTER_CRV)
               EgtSetStatus( nId2, GDB_ST.OFF)
               EgtSetColor( nId2, 'BLACK')
            end
         end
      else
         
         local bErr = true
         -- se nessuna curva
         if #vClosedId == 0 and #vOpenId == 0 then
            bErr = false
         -- se una sola curva, ne verifico larghezza media
         elseif #vClosedId == 1 then
            local dLen = EgtCurveLength( vClosedId[1])
            local _, _, dArea = EgtCurveArea( vClosedId[1])
            if not dArea or dArea / dLen < MID_TOLER then bErr = false end
         end
         
         -- se vero errore lo segnalo
         if bErr then
            table.insert( vErr, nLayCnt)
            -- cambio nome al layer
            EgtSetName( nLayId, '__' .. SLICE_LAYER .. EgtNumToString( nLayCnt))
         else
            -- altrimenti creo il CrvGrp da utilizzare nel CalcPath
            local nGrpCrv = EgtGroup( nLayId)
            EgtSetName( nGrpCrv, CONTOUR_GRP .. EgtNumToString( 1))
         end
      end
      
      -- passo al layer successivo
      if EgtProcessEvents( EgtIf( PRINT, 100, 0) + nLayCnt / ( #vZSlices + 3) * 100, 0) == 1 then
         -- elimino i layer non ancora analizzati
         local nNext = EgtGetNext( nLayId)
         while nNext do
            local nCurr = nNext
            nNext = EgtGetNext( nCurr)
            EgtErase( nCurr)
         end
         return false
      end
      
      nLayCnt = nLayCnt + 1
      nLayId = EgtGetNext( nLayId)
   end

   local bSpiralVase = EgtGetInfo( s_nPartId, KEY_SPIRAL_VASE, 'b') or false
   if not bSpiralVase then
      -- costolature
      local nRibsLay = EgtGetFirstNameInGroup( s_nPartId, LAY_RIBS)
      if nRibsLay then
         SlicingExtraObjects( vtSlicing, nRibsLay, TYPE.RIB, RIBS_GRP, RIBS_CRV)
      end
      if EgtProcessEvents( EgtIf( PRINT, 100, 0) + ( #vZSlices + 1) / ( #vZSlices + 3) * 100, 0) == 1 then return false end
      
      -- solidi per regioni con diverso numero di passate
      local nShellNbrLay = EgtGetFirstNameInGroup( s_nPartId, LAY_SHELL_NBR)
      if nShellNbrLay then
         SlicingExtraObjects( vtSlicing, nShellNbrLay, TYPE.EXTRA_SHELL, SHELL_NBR_GRP, SHELL_NBR_CRV)
      end
      if EgtProcessEvents( EgtIf( PRINT, 100, 0) + ( #vZSlices + 2) / ( #vZSlices + 3) * 100, 0) == 1 then return false end
      
      -- solidi ausiliari
      local nAuxSolidsLay = EgtGetFirstNameInGroup( s_nPartId, LAY_AUX_SOLIDS)
      if nAuxSolidsLay then
         AdjustAuxSolids( nAuxSolidsLay)
         SlicingExtraObjects( vtSlicing, nAuxSolidsLay, TYPE.AUX_SOLID, AUX_SOLIDS_GRP, AUX_SOLIDS_CRV)
      end
      if EgtProcessEvents( EgtIf( PRINT, 100, 0) + ( #vZSlices + 3) / ( #vZSlices + 3) * 100, 0) == 1 then return false end
   end
   
   return true
end

---------------------------------------------------------------------
function CalcSlices.Exec( nPartId, nStmId, HMax)

   s_nPartId = nPartId

   -- recupero la direzione dello slicing
   local vtSlicing = Z_AX()
   local nSlicingType = EgtGetInfo( s_nPartId, KEY_SLICING_TYPE, 'i')
   if nSlicingType == SLICING_TYPE.DEG45_X then
      vtSlicing =  VectorFromSpherical( 1, 45, 0)
   elseif nSlicingType == SLICING_TYPE.DEG45_Y then
      vtSlicing = VectorFromSpherical( 1, 45, -90)
   elseif nSlicingType == SLICING_TYPE.HORIZONTAL then
      vtSlicing = X_AX()
   end

   EgtSetInfo( s_nPartId, KEY_SLICING_DIR, vtSlicing)
   local frSlicing = Frame3d( ORIG(), vtSlicing)
   
   -- recupero la superficie ed eventuali setti esterni/unbounded da usare come riferimenti per quote slicing
   local vRefIds = {}
   if nStmId then table.insert( vRefIds, nStmId) end
   local nRibsLay = EgtGetFirstNameInGroup( s_nPartId, LAY_RIBS) 
   local vRibsIds = EgtGetAllInGroup( nRibsLay)
   for i = 1, #vRibsIds do
      if EgtGetType( vRibsIds[i]) == GDB_TY.SRF_MESH then
         local nType = ReadParam( vRibsIds[i], KEY_RIBS_TYPE, 'i', RIB_TYPE.INTERNAL)
         if nType == RIB_TYPE.EXTERNAL or nType == RIB_TYPE.UNBOUNDED then
            table.insert( vRefIds, vRibsIds[i])
         end
      end
   end
   
   -- recupero il box
   local b3Box = BBox3d()
   for i = 1, #vRefIds do
      local b3Tmp = EgtGetBBoxRef( vRefIds[i], GDB_BB.STANDARD, frSlicing)
      b3Box:Add( b3Tmp)
   end
   if not b3Box or b3Box:isEmpty() then
      EgtOutBox( "No part to be sliced!", 'Error', 'ERROR')
      return
   end
   
   -- Parametri di slicing
   local dSliceStep = EgtGetInfo( s_nPartId, KEY_SLICE_STEP, 'd') or 10000
   if dSliceStep < GEO.EPS_SMALL then
      EgtOutLog( 'Warning : SliceStep is 0')
      return
   end

   local dZmin = b3Box:getMin():getZ()
   local dZmax = b3Box:getMax():getZ()
   local dMaxH = ComputeMaxH( vRefIds, frSlicing, HMax, dSliceStep)
   dZmax = min( dZmax, dMaxH)
   --dZmin = 708
   --dZmax = 712
   
   -- Eseguo slicing
   local nLayCnt = 1 
   local nRecalc = 0
   local dDeltaZStart = 0.2
   
   local vZSlices = ComputeZSlices( dSliceStep, dZmin, dDeltaZStart, dZmax)

   local vErr = {}
   local bOk = true
   if not nStmId then
      -- caso senza solido e solo setti
      bOk = SlicingNoSolid( nRibsLay, vZSlices, dDeltaZStart, dZmin, frSlicing, vErr)
   else
      -- caso con solido
      bOk = SlicingWithSolid( nStmId, vZSlices, dDeltaZStart, dZmin, frSlicing, vErr)
   end
   
   -- eventuale segnalazione errori
   if bOk and #vErr > 0 then
      EgtOutBox( 'Slicing Error on layers :\n' .. table.concat( vErr, ','), 'SlicingCalc')
    end
    
    return bOk
end

---------------------------------------------------------------------
return CalcSlices