  Recent remarkable advances in large-scale text-to-image diffusion models have
inspired a significant breakthrough in text-to-3D generation, pursuing 3D
content creation solely from a given text prompt. However, existing text-to-3D
techniques lack a crucial ability in the creative process: interactively
control and shape the synthetic 3D contents according to users' desired
specifications (e.g., sketch). To alleviate this issue, we present the first
attempt for text-to-3D generation conditioning on the additional hand-drawn
sketch, namely Control3D, which enhances controllability for users. In
particular, a 2D conditioned diffusion model (ControlNet) is remoulded to guide
the learning of 3D scene parameterized as NeRF, encouraging each view of 3D
scene aligned with the given text prompt and hand-drawn sketch. Moreover, we
exploit a pre-trained differentiable photo-to-sketch model to directly estimate
the sketch of the rendered image over synthetic 3D scene. Such estimated sketch
along with each sampled view is further enforced to be geometrically consistent
with the given sketch, pursuing better controllable text-to-3D generation.
Through extensive experiments, we demonstrate that our proposal can generate
accurate and faithful 3D scenes that align closely with the input text prompts
and sketches.
