vtkTextActor will render very tiny wrong block if empty string/space is set as the input
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Detected this issue in VTK 5.10, i guess it is old issue related to #10905 (closed) When empty string("")/space(" ") is set as vtkTextActor Input, got some error report as "No scalar values found for texture input!" from vtkOpenGLTexture. I discovered there is some tiny block rendered on the screen.
I think the simple fix is not render vtkTextActor if Texture input data is empty(0). Maybe better approach is correct some image data in vtkFreeTypeUtilities.