设置颜色1
vessel_actors->GetProperty()->SetColor(0.75, 0.75, 0.75);
此时，会显示蓝色
需要设置对应的mapper1
vessel_mappers->ScalarVisibilityOff();
参考：
http://vtk.1045678.n5.nabble.com/vtkActor-GetProperty-gt-SetColor-not-working-for-me-td5722373.html
vtk设置actor颜色问题
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