How to render point cloud as spheres

[Lapayo]

Hi,
I would like to render a point cloud using Pytorch3D as spheres of constant size in world. So a sphere far away should be much smaller than a sphere very close. I try using the PerspectiveCamera+PointRasterizer+Renderer for this.
However, it seems like every sphere has a constant size in the image plane in the end.
How can I specify a radius (preferably in world units) that will scale with depth using the PointRenderer?

Thanks in advance!