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could I write something like this? 'take a map Private Sub Petadasar_Click() Dim p1MxDoc As IMxDocument Set p1MxDoc = ThisDocument Dim p1GxDialog As IGxDialog Set p1GxDialog = New GxDialog p1GxDialog.AllowMultiSelect = True p1GxDialog.Title = "Select Feature Classes to Add To Map" Dim p1GxFilter As IGxObjectFilter Set p1GxFilter = New GxFilterFeatureClasses Set p1GxDialog.ObjectFilter = p1GxFilter Dim p1GxObjects As IEnumGxObject p1GxDialog.DoModalOpen Thisdocument.Parent.hWnd, p1GxObjects If (p1GxObjects Is Nothing) Then Exit Sub p1GxObjects.Reset Dim p1Layer As IFeatureLayer Dim p1GxDataset As IGxDataset Set p1GxDataset = p1GxObjects.Next Do Until (p1GxDataset Is Nothing) Set p1Layer = New FeatureLayer Set p1Layer.FeatureClass = p1GxDataset.Dataset p1Layer.Name = p1Layer.FeatureClass.AliasName p1MxDoc.FocusMap.Addlayer p1Layer Set p1GxDataset = p1GxObjects.Next Loop p1MxDoc.ActiveView.PartialRefresh esriViewGeography, Nothing, Nothing End Sub 'determining a process Public Sub ComboBox1_DropButtonclick() With ComboBox1 .AddItem "Flood region" .AddItem "Urban distance" .AddItem "Roadway distance" .AddItem "Topograph" .AddItem "Slope" .AddItem "Environmental load" End With End Sub Private Sub CommandButton2_Click() Dim pDoc As IMxDocument Dim pLayer As IFeatureLayer Dim pFeatClass As IFeatureClass Dim GP As Object Set pDoc = ThisDocument Set pLayer = pDoc.SelectedLayer Set GP = CreateObject("esriGeoprocessing.GpDispatch.1") If ComboBox1 = "Flood region" Then GP.Buffer_analysis FCPath, pLayer, "50000" end if end sub

umm... not an engineer myself, i think most of the users here are more or less geographers and researchers and most of the cases ArcGIS is the best they got (including me). Mapping and spatial analysis is easy with AG but C3D is more focused at BIM. Both has their own facilities and drawbacks. I think it is safe to use a package for what it can do best. 1.I see that C3D can handle up to 2 billion point, will it do? 2. Stronger GPU/CPU is always an obvious issue for model building and batch operations. I guess the subjected person will know best what he is up to. 3. The perception of the phrase 'sophisticated GIS analysis' is still unclear. So far we couldn't find a reason to desert our beloved ArcGIS (except few 'minor' glitches ). Whenever we find one, believe me, I'll be the first to through it away. You had your experience already, so will not be difficult to understand what names stand for.