How to change the volume rendering setting to make the rendering effect from picture1 to picture2

picture1:obtain the vessel scalar volume node from VMTK,use preset [Vesselness]

picture2:change vessel to segmentation,the rendering segmentation in 3D

You could try simpleitk sigmoidfilter (adjusting the parameters). It may help to enhance the vessels for later segmentation if the threshold is selected correctly…
I think that effect you got is because you used islands effect to keep part of the vessels and not all of them

I can change the vessel volume rendering to model rendering and segmentation rendering to avoid this problem , maybe is the vmtk [vesselness] preset cause the opacity rendering , CT and MRI preset is fine

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