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  • error: forward declaration of ‘struct vtkXYZ’


<source lang="cpp"> actor->GetProperty()->SetColor(0, 1, 0); </source>

error: forward declaration of ‘struct vtkProperty’

Explanation The GetProperty() function returns a vtkProperty object. Even though you didn't need to reference it explicitly, the compiler still needs to know what it is!

Solution This is solved by simply including vtkProperty.h:

<source lang="cpp">

  1. include <vtkProperty.h>