  Given a single image of a 3D object, this paper proposes a novel method
(named ConsistNet) that is able to generate multiple images of the same object,
as if seen they are captured from different viewpoints, while the 3D
(multi-view) consistencies among those multiple generated images are
effectively exploited. Central to our method is a multi-view consistency block
which enables information exchange across multiple single-view diffusion
processes based on the underlying multi-view geometry principles. ConsistNet is
an extension to the standard latent diffusion model, and consists of two
sub-modules: (a) a view aggregation module that unprojects multi-view features
into global 3D volumes and infer consistency, and (b) a ray aggregation module
that samples and aggregate 3D consistent features back to each view to enforce
consistency. Our approach departs from previous methods in multi-view image
generation, in that it can be easily dropped-in pre-trained LDMs without
requiring explicit pixel correspondences or depth prediction. Experiments show
that our method effectively learns 3D consistency over a frozen Zero123
backbone and can generate 16 surrounding views of the object within 40 seconds
on a single A100 GPU. Our code will be made available on
https://github.com/JiayuYANG/ConsistNet
