render normal map but in eye coordinate

[mate-huaboy]

I would appreciate it actually, there have been some issues about rendering normals, but I found that they all seem to render normals below the object coordinate system,sach as #865

    def phong_normal_shading(self, meshes, fragments) -> torch.Tensor:
        faces = meshes.faces_packed()  # (F, 3)
        vertex_normals = meshes.verts_normals_packed()  # (V, 3)
        faces_normals = vertex_normals[faces]
        ones = torch.ones_like(fragments.bary_coords)
        pixel_normals = interpolate_face_attributes(
            fragments.pix_to_face, ones, faces_normals
        )
        return pixel_normals

here meshes.verts_normals_packed() return the normal is in object(the mesh) coordinate system,so Z is -1 to 1 but not0 to -1, In order for it to be able to render normals in the camera coordinate system,I Reorganizing the mesh,

mesh_nv=mesh.verts_normals_list()[0]
normals=R.view(1,3,3)@mesh_nv[...,None] #trans to eye coordinate
normals.squeeze_()
normals=nv[None]
mesh1=Meshes(verts=mesh.verts_list(),faces=mesh.faces_list(),verts_normals=nv)

then I let mash1 as input to get the normals map. But I don't know if MY understanding and practice are right and I dont konw how to Verify that it is correct. Could sameone please give me some advice,I would appreciate it.thanks!!