How to render a model transparently in pytorch3d

[Teklaw7]

Hi all, I have 2 objects to vizualise in pytorch3d with plot_scene, in one hand a fiber which is a vtkpolydata and on an other hand a shape of a brain which is also a vtkpolydata. So when I want to render these two objects, I would like to get my fiber which is within my brain. Is there a function in pytorch3d or other to render my brain transparent to be able to see my fiber ?
Thank you for your help

[Teklaw7]

By the way I use the function plot_scene from pytorch3d.vis.plotly_vis to vizualise my objects