Dear @Kiran_Ikram, Mesh R-CNN used both Pix3d and ShapeNet.
For shapenet you can register here https://www.shapenet.org/ 1
It is around 1TB when you unzip it,  ( considering all the different subdatasets they have Sem, Core etc) .
You can also see a great list of Datasets here https://github.com/timzhang642/3D-Machine-Learning 5
Depends on your task