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Shap-E

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Shap-E

The Shap-E model was proposed in Shap-E: Generating Conditional 3D Implicit Functions by Alex Nichol and Heewon Jun from OpenAI.

The abstract from the paper is:

We present Shap-E, a conditional generative model for 3D assets. Unlike recent work on 3D generative models which produce a single output representation, Shap-E directly generates the parameters of implicit functions that can be rendered as both textured meshes and neural radiance fields. We train Shap-E in two stages: first, we train an encoder that deterministically maps 3D assets into the parameters of an implicit function; second, we train a conditional diffusion model on outputs of the encoder. When trained on a large dataset of paired 3D and text data, our resulting models are capable of generating complex and diverse 3D assets in a matter of seconds. When compared to Point-E, an explicit generative model over point clouds, Shap-E converges faster and reaches comparable or better sample quality despite modeling a higher-dimensional, multi-representation output space.

The original codebase can be found at openai/shap-e.

Make sure to check out the Schedulers guide to learn how to explore the tradeoff between scheduler speed and quality, and see the reuse components across pipelines section to learn how to efficiently load the same components into multiple pipelines.

Usage Examples

In the following, we will walk you through some examples of how to use Shap-E pipelines to create 3D objects in gif format.

Text-to-3D image generation

We can use ShapEPipeline to create 3D object based on a text prompt. In this example, we will make a birthday cupcake for :firecracker: diffusers library’s 1 year birthday. The workflow to use the Shap-E text-to-image pipeline is same as how you would use other text-to-image pipelines in diffusers.

import torch

from diffusers import DiffusionPipeline

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

repo = "openai/shap-e"
pipe = DiffusionPipeline.from_pretrained(repo, torch_dtype=torch.float16)
pipe = pipe.to(device)

guidance_scale = 15.0
prompt = ["A firecracker", "A birthday cupcake"]

images = pipe(
    prompt,
    guidance_scale=guidance_scale,
    num_inference_steps=64,
    frame_size=256,
).images

The output of ShapEPipeline is a list of lists of images frames. Each list of frames can be used to create a 3D object. Let’s use the export_to_gif utility function in diffusers to make a 3D cupcake!

from diffusers.utils import export_to_gif

export_to_gif(images[0], "firecracker_3d.gif")
export_to_gif(images[1], "cake_3d.gif")

img img

Image-to-Image generation

You can use ShapEImg2ImgPipeline along with other text-to-image pipelines in diffusers and turn your 2D generation into 3D.

In this example, We will first genrate a cheeseburger with a simple prompt “A cheeseburger, white background” 

from diffusers import DiffusionPipeline
import torch

pipe_prior = DiffusionPipeline.from_pretrained("kandinsky-community/kandinsky-2-1-prior", torch_dtype=torch.float16)
pipe_prior.to("cuda")

t2i_pipe = DiffusionPipeline.from_pretrained("kandinsky-community/kandinsky-2-1", torch_dtype=torch.float16)
t2i_pipe.to("cuda")

prompt = "A cheeseburger, white background"

image_embeds, negative_image_embeds = pipe_prior(prompt, guidance_scale=1.0).to_tuple()
image = t2i_pipe(
    prompt,
    image_embeds=image_embeds,
    negative_image_embeds=negative_image_embeds,
).images[0]

image.save("burger.png")

img

we will then use the Shap-E image-to-image pipeline to turn it into a 3D cheeseburger :)

from PIL import Image
from diffusers.utils import export_to_gif

repo = "openai/shap-e-img2img"
pipe = DiffusionPipeline.from_pretrained(repo, torch_dtype=torch.float16)
pipe = pipe.to("cuda")

guidance_scale = 3.0
image = Image.open("burger.png").resize((256, 256))

images = pipe(
    image,
    guidance_scale=guidance_scale,
    num_inference_steps=64,
    frame_size=256,
).images

gif_path = export_to_gif(images[0], "burger_3d.gif")

img

Generate mesh

For both ShapEPipeline and ShapEImg2ImgPipeline, you can generate mesh output by passing output_type as mesh to the pipeline, and then use the ShapEPipeline.export_to_ply utility function to save the output as a ply file. We also provide a ShapEPipeline.export_to_obj function that you can use to save mesh outputs as obj files.

import torch

from diffusers import DiffusionPipeline
from diffusers.utils import export_to_ply

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

repo = "openai/shap-e"
pipe = DiffusionPipeline.from_pretrained(repo, torch_dtype=torch.float16, variant="fp16")
pipe = pipe.to(device)

guidance_scale = 15.0
prompt = "A birthday cupcake"

images = pipe(prompt, guidance_scale=guidance_scale, num_inference_steps=64, frame_size=256, output_type="mesh").images

ply_path = export_to_ply(images[0], "3d_cake.ply")
print(f"saved to folder: {ply_path}")

Huggingface Datasets supports mesh visualization for mesh files in glb format. Below we will show you how to convert your mesh file into glb format so that you can use the Dataset viewer to render 3D objects.

We need to install trimesh library.

pip install trimesh

To convert the mesh file into glb format, 

import trimesh

mesh = trimesh.load("3d_cake.ply")
mesh.export("3d_cake.glb", file_type="glb")

By default, the mesh output of Shap-E is from the bottom viewpoint; you can change the default viewpoint by applying a rotation transformation

import trimesh
import numpy as np

mesh = trimesh.load("3d_cake.ply")
rot = trimesh.transformations.rotation_matrix(-np.pi / 2, [1, 0, 0])
mesh = mesh.apply_transform(rot)
mesh.export("3d_cake.glb", file_type="glb")

Now you can upload your mesh file to your dataset and visualize it! Here is the link to the 3D cake we just generated https://huggingface.co/datasets/hf-internal-testing/diffusers-images/blob/main/shap_e/3d_cake.glb

ShapEPipeline

class diffusers.ShapEPipeline

< >

( prior: PriorTransformer text_encoder: CLIPTextModelWithProjection tokenizer: CLIPTokenizer scheduler: HeunDiscreteScheduler shap_e_renderer: ShapERenderer )

Parameters

  • prior (PriorTransformer) — The canonincal unCLIP prior to approximate the image embedding from the text embedding.
  • text_encoder (CLIPTextModelWithProjection) — Frozen text-encoder.
  • tokenizer (CLIPTokenizer) — A CLIPTokenizer to tokenize text.
  • scheduler (HeunDiscreteScheduler) — A scheduler to be used in combination with prior to generate image embedding.
  • shap_e_renderer (ShapERenderer) — Shap-E renderer projects the generated latents into parameters of a MLP that’s used to create 3D objects with the NeRF rendering method.

Pipeline for generating latent representation of a 3D asset and rendering with NeRF method with Shap-E.

This model inherits from DiffusionPipeline. Check the superclass documentation for the generic methods implemented for all pipelines (downloading, saving, running on a particular device, etc.).

__call__

< >

( prompt: str num_images_per_prompt: int = 1 num_inference_steps: int = 25 generator: typing.Union[torch._C.Generator, typing.List[torch._C.Generator], NoneType] = None latents: typing.Optional[torch.FloatTensor] = None guidance_scale: float = 4.0 frame_size: int = 64 output_type: typing.Optional[str] = 'pil' return_dict: bool = True ) → ShapEPipelineOutput or tuple

Parameters

  • prompt (str or List[str]) — The prompt or prompts to guide the image generation.
  • num_images_per_prompt (int, optional, defaults to 1) — The number of images to generate per prompt.
  • num_inference_steps (int, optional, defaults to 25) — The number of denoising steps. More denoising steps usually lead to a higher quality image at the expense of slower inference.
  • generator (torch.Generator or List[torch.Generator], optional) — A torch.Generator to make generation deterministic.
  • latents (torch.FloatTensor, optional) — Pre-generated noisy latents sampled from a Gaussian distribution, to be used as inputs for image generation. Can be used to tweak the same generation with different prompts. If not provided, a latents tensor is generated by sampling using the supplied random generator.
  • guidance_scale (float, optional, defaults to 4.0) — A higher guidance scale value encourages the model to generate images closely linked to the text prompt at the expense of lower image quality. Guidance scale is enabled when guidance_scale > 1. usually at the expense of lower image quality.
  • frame_size (int, optional, default to 64) — The width and height of each image frame of the generated 3D output.
  • output_type (str, optional, defaults to "pt") — The output format of the generate image. Choose between: "pil" (PIL.Image.Image), "np" (np.array),"latent" (torch.Tensor), mesh (MeshDecoderOutput).
  • return_dict (bool, optional, defaults to True) — Whether or not to return a ShapEPipelineOutput instead of a plain tuple.

Returns

ShapEPipelineOutput or tuple

If return_dict is True, ShapEPipelineOutput is returned, otherwise a tuple is returned where the first element is a list with the generated images.

The call function to the pipeline for generation.

Examples:

>>> import torch
>>> from diffusers import DiffusionPipeline
>>> from diffusers.utils import export_to_gif

>>> device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

>>> repo = "openai/shap-e"
>>> pipe = DiffusionPipeline.from_pretrained(repo, torch_dtype=torch.float16)
>>> pipe = pipe.to(device)

>>> guidance_scale = 15.0
>>> prompt = "a shark"

>>> images = pipe(
...     prompt,
...     guidance_scale=guidance_scale,
...     num_inference_steps=64,
...     frame_size=256,
... ).images

>>> gif_path = export_to_gif(images[0], "shark_3d.gif")

enable_model_cpu_offload

< >

( gpu_id = 0 )

Offload all models to CPU to reduce memory usage with a low impact on performance. Moves one whole model at a time to the GPU when its forward method is called, and the model remains in GPU until the next model runs. Memory savings are lower than using enable_sequential_cpu_offload, but performance is much better due to the iterative execution of the unet.

ShapEImg2ImgPipeline

class diffusers.ShapEImg2ImgPipeline

< >

( prior: PriorTransformer image_encoder: CLIPVisionModel image_processor: CLIPImageProcessor scheduler: HeunDiscreteScheduler shap_e_renderer: ShapERenderer )

Parameters

  • prior (PriorTransformer) — The canonincal unCLIP prior to approximate the image embedding from the text embedding.
  • image_encoder (CLIPVisionModel) — Frozen image-encoder.
  • image_processor (CLIPImageProcessor) — A CLIPImageProcessor to process images.
  • scheduler (HeunDiscreteScheduler) — A scheduler to be used in combination with prior to generate image embedding.
  • shap_e_renderer (ShapERenderer) — Shap-E renderer projects the generated latents into parameters of a MLP that’s used to create 3D objects with the NeRF rendering method.

Pipeline for generating latent representation of a 3D asset and rendering with NeRF method with Shap-E from an image.

This model inherits from DiffusionPipeline. Check the superclass documentation for the generic methods implemented for all pipelines (downloading, saving, running on a particular device, etc.).

__call__

< >

( image: typing.Union[PIL.Image.Image, typing.List[PIL.Image.Image]] num_images_per_prompt: int = 1 num_inference_steps: int = 25 generator: typing.Union[torch._C.Generator, typing.List[torch._C.Generator], NoneType] = None latents: typing.Optional[torch.FloatTensor] = None guidance_scale: float = 4.0 frame_size: int = 64 output_type: typing.Optional[str] = 'pil' return_dict: bool = True ) → ShapEPipelineOutput or tuple

Parameters

  • image (torch.FloatTensor, PIL.Image.Image, np.ndarray, List[torch.FloatTensor], List[PIL.Image.Image], or List[np.ndarray]) — Image or tensor representing an image batch to be used as the starting point. Can also accept image latents as image, if passing latents directly, it will not be encoded again.
  • num_images_per_prompt (int, optional, defaults to 1) — The number of images to generate per prompt.
  • num_inference_steps (int, optional, defaults to 100) — The number of denoising steps. More denoising steps usually lead to a higher quality image at the expense of slower inference.
  • generator (torch.Generator or List[torch.Generator], optional) — A torch.Generator to make generation deterministic.
  • latents (torch.FloatTensor, optional) — Pre-generated noisy latents sampled from a Gaussian distribution, to be used as inputs for image generation. Can be used to tweak the same generation with different prompts. If not provided, a latents tensor is generated by sampling using the supplied random generator.
  • guidance_scale (float, optional, defaults to 4.0) — A higher guidance scale value encourages the model to generate images closely linked to the text prompt at the expense of lower image quality. Guidance scale is enabled when guidance_scale > 1.
  • frame_size (int, optional, default to 64) — The width and height of each image frame of the generated 3D output.
  • output_type (str, optional, defaults to "pt") — (np.array),"latent" (torch.Tensor), mesh (MeshDecoderOutput).
  • return_dict (bool, optional, defaults to True) — Whether or not to return a ShapEPipelineOutput instead of a plain tuple.

Returns

ShapEPipelineOutput or tuple

If return_dict is True, ShapEPipelineOutput is returned, otherwise a tuple is returned where the first element is a list with the generated images.

The call function to the pipeline for generation.

Examples:

>>> from PIL import Image
>>> import torch
>>> from diffusers import DiffusionPipeline
>>> from diffusers.utils import export_to_gif, load_image

>>> device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

>>> repo = "openai/shap-e-img2img"
>>> pipe = DiffusionPipeline.from_pretrained(repo, torch_dtype=torch.float16)
>>> pipe = pipe.to(device)

>>> guidance_scale = 3.0
>>> image_url = "https://hf.co/datasets/diffusers/docs-images/resolve/main/shap-e/corgi.png"
>>> image = load_image(image_url).convert("RGB")

>>> images = pipe(
...     image,
...     guidance_scale=guidance_scale,
...     num_inference_steps=64,
...     frame_size=256,
... ).images

>>> gif_path = export_to_gif(images[0], "corgi_3d.gif")

ShapEPipelineOutput

class diffusers.pipelines.shap_e.pipeline_shap_e.ShapEPipelineOutput

< >

( images: typing.Union[typing.List[typing.List[PIL.Image.Image]], typing.List[typing.List[numpy.ndarray]]] )

Parameters

  • images (torch.FloatTensor) — A list of images for 3D rendering.

Output class for ShapEPipeline and ShapEImg2ImgPipeline.

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