   SlimDX - Mesh.Simplify and Progressive Meshes
  Can someone confirm if either simplify or progressive meshes work in SlimDX.  I know they probably do but the calls take very few parameters but they fail everytime (no matter what I pass).  Is there something I need to know/change about the 'source' mesh before calling either ?Thanks for any help.   
  "Fail" isn't an problem description, unfortunately. What do they return/throw? Does the debug DX runtime report anything?   ;  You are right, when I say 'fail' I mean crash my app.  I dont know how to get any more info out of directx.  If you tell me I will do it.  The only error reported is 'invalid call' everytime - SlimDX.Direct3D9.Direct3D9Exception: D3DERR_INVALIDCALL: Invalid call (-2005530516)   at SlimDX.Result.Throw[T](Object dataKey, Object dataValue)   at SlimDX.Result.Record[T](Int32 hr, Boolean failed, Object dataKey, Object dataValue)   at SlimDX.Direct3D9.ProgressiveMesh..ctor(Mesh mesh, Int32 minimumValue, MeshSimplification options)   at WindowsApplication1.clsGame3.LoadContent(Boolean pDeviceReset) in C:\Source\SlimDX\Simple\Simple\Game 3\clsGame3Main.vb:line 762;  Check out this document.   ;  And this is the call I make -Dim pm As New ProgressiveMesh(cGeometry, 1, MeshSimplification.Vertex)cGeometry has position, normal, texture coord, tangent and birnormal for its vertex declaration.Does this help ?   ;  i am running the debug version and have installed the debugview.  I am getting a load of warnings/output for other stuff (not related), but my simplify and progressive mesh calls dont produce any output.  Just the invalid call errors.Any ideas ?;  SOLVED - You have to 'clean' the mesh first before calling either.Thanks for your tips on debugging though, very usefull.   