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Concave polygons are not rendered as expected with vtkPolyDataMapper and vtkActor2D (see below). Is it by design or is it a bug? If it's by design, is there any flag can be set to alter the rendering behaviour?<BR>
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Thanks!<BR><BR>Xiaofeng<BR><BR>
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Hi all,<BR> <BR>How do I make uniform transparency in a concave polygon, instead of getting multiple shades, e.g. in the attached graph?<BR> <BR>The polygon are created with:<BR> <BR><FONT size=2 face=Consolas><FONT size=2 face=Consolas>vtkPoints* points = vtkPoints::New();<BR>vtkCellArray* cells = vtkCellArray::New();<BR>points->SetNumberOfPoints(4);<BR> <BR>// create a concave polygon (equilateral with a cutout at the bottom)</FONT></FONT> <BR>
<FONT color=#008000 size=2 face=Consolas><FONT color=#008000 size=2 face=Consolas><FONT color=#008000 size=2 face=Consolas><BR></FONT></FONT></FONT><FONT size=2 face=Consolas><FONT size=2 face=Consolas>points->SetPoint(0, 10.0, 10.0, 0.0);<BR>points->SetPoint(1, 110.0, 183.2, 0.0);<BR>points->SetPoint(2, 210.0, 10.0, 0.0);<BR>points->SetPoint(3, 110.0, 110.0, 0.0);<BR>cells->Allocate(1, 5);<BR>cells->InsertNextCell(5);<BR>cells->InsertCellPoint(0);<BR>cells->InsertCellPoint(1);<BR>cells->InsertCellPoint(2);<BR>cells->InsertCellPoint(3);<BR>cells->InsertCellPoint(0);<BR>vtkPolyData* poly = vtkPolyData::New();<BR>poly->Initialize();<BR>poly->SetGlobalWarningDisplay(1);<BR>poly->SetPoints(points);<BR>poly->SetPolys(cells);<BR></FONT></FONT> <BR>A vtkActor2D and a vtkPolyDataMapper2D was used for the rendering.<BR><BR>Many thanks!<BR>Xiaofeng<BR><BR><BR><BR>
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