MODEL IDmicrosoft:trellis-2@4b
live

TRELLIS.2

Microsoft
by Microsoft

TRELLIS.2 is a 4-billion-parameter 3D generative model that transforms 2D images into fully textured 3D assets with complex topology, sharp features, and physically based rendering materials. It uses a novel field-free sparse voxel representation and scalable structured latent space to enable efficient, high-resolution 3D generation from single image input.

TRELLIS.2

API Options

Platform-level options for task execution and delivery.

taskType

stringrequiredvalue: 3dInference

Identifier for the type of task being performed

taskUUID

stringrequiredUUID v4

UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

outputType

stringdefault: URL

3D output type.

Allowed values1 value

outputFormat

stringdefault: GLB

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

  • `GLB`: Binary glTF format for 3D models, including geometry, textures, and PBR materials.
Allowed values1 value

webhookURL

stringuri

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

Learn more1 resource

deliveryMethod

stringdefault: async

Determines how the API delivers task results.

Allowed values2 values
Returns complete results directly in the API response.
Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.
Learn more1 resource

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

Common use cases:

  • Cloud storage: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
  • CDN integration: Upload to content delivery networks for immediate distribution.
// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg

The content data will be sent as the request body to the specified URL when generation is complete.

ttl

integermin: 60

Time-to-live (TTL) in seconds for generated content. Only applies when outputType is URL.

Include task cost in the response.

numberResults

integermin: 1max: 4default: 1

Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

Inputs

Input resources for the task (images, audio, etc). These must be nested inside the inputs object.

inputs » image

image

stringrequired

Image input (UUID, URL, Data URI, or Base64).

inputs » meshFile

meshFile

string

3D model to re-texture (UUID or URL). Skips geometry generation and applies new textures using the reference image.

Core Parameters

Primary parameters that define the task output.

model

stringrequiredvalue: microsoft:trellis-2@4b

Identifier of the model to use for generation.

Learn more3 resources

seed

integermin: 0max: 9223372036854776000

Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range.

Learn more1 resource

Settings

Technical parameters to fine-tune the inference process. These must be nested inside the settings object.

settings » resolution

resolution

integerdefault: 1024

Voxel grid resolution for 3D generation. Higher values capture finer geometric detail.

Allowed values3 values
settings » alphaMode

alphaMode

stringdefault: OPAQUE

Material alpha mode for the output mesh.

Allowed values3 values
settings » decimationTarget

decimationTarget

integermin: 5000max: 1000000default: 500000

Target polygon count for mesh simplification. Lower values produce lighter models at the cost of geometric detail.

settings » dracoCompression

Apply KHR_draco_mesh_compression to the output GLB. Reduces geometry size 5-10x with no triangle loss.

Properties5 properties
settings » dracoCompression » enabled

enabled

boolean

Compress the output GLB geometry with Draco.

settings » dracoCompression » level

level

integermin: 0max: 10default: 7

Encoding effort for Draco compression. Higher values reduce file size further but encode more slowly.

settings » dracoCompression » quantizationNormal

quantizationNormal

integermin: 8max: 30default: 14

Quantization bits for vertex normals. Higher values produce smoother shading at the cost of file size.

settings » dracoCompression » quantizationPosition

quantizationPosition

integermin: 8max: 30default: 16

Quantization bits for vertex positions. Higher values preserve more positional detail at the cost of file size.

settings » dracoCompression » quantizationTexCoord

quantizationTexCoord

integermin: 8max: 30default: 14

Quantization bits for texture coordinates. Higher values keep textures sharper at UV seams at the cost of file size.

settings » meshCluster

UV chart clustering settings for the output mesh.

Properties4 properties
settings » meshCluster » globalIterations

globalIterations

integermin: 0max: 64default: 1

Global iterations for chart clustering.

settings » meshCluster » refineIterations

refineIterations

integermin: 0max: 64default: 0

Local refinement iterations for chart clustering.

settings » meshCluster » smoothStrength

smoothStrength

integermin: 0max: 10default: 1

Smoothing strength applied during chart clustering.

settings » meshCluster » thresholdConeHalfAngleRad

thresholdConeHalfAngleRad

floatmin: 0max: 3.141592653589793default: 1.5707963267948966

Cone half-angle threshold in radians used during UV chart clustering.

settings » remesh

remesh

booleandefault: true

Whether to remesh the output for cleaner topology.

settings » remeshBand

remeshBand

floatmin: 0max: 16default: 1

Narrow-band width in voxels used for dual-contouring remeshing.

settings » remeshProject

remeshProject

floatmin: 0max: 1default: 0

Projection factor for snapping remeshed vertices back to the original surface.

settings » shapeSlat

shapeSlat

object

Sampler for the Structured Latent stage that refines the 3D geometry.

Properties6 properties
settings » shapeSlat » steps

steps

integermin: 1max: 50default: 12

Number of denoising steps. More steps improve quality but increase generation time.

settings » shapeSlat » guidanceIntervalEnd

guidanceIntervalEnd

floatmin: 0max: 1default: 1

End of the sampling schedule fraction over which guidance is applied.

settings » shapeSlat » guidanceIntervalStart

guidanceIntervalStart

floatmin: 0max: 1default: 0.6

Start of the sampling schedule fraction over which guidance is applied.

settings » shapeSlat » guidanceRescale

guidanceRescale

floatmin: 0max: 1default: 0.5

Dampens oversaturation from high guidance values. Lower values apply more correction.

settings » shapeSlat » guidanceStrength

guidanceStrength

floatmin: 1max: 10default: 7.5

How closely the output follows the input image. Higher values enforce stricter adherence to the visible geometry.

settings » shapeSlat » rescaleT

rescaleT

floatmin: 1max: 6default: 3

Timestep rescaling factor for the sampling schedule. Controls how guidance strength is distributed across steps.

settings » sparseStructure

Sampler for the initial sparse voxel grid that establishes the basic 3D geometry.

Properties6 properties
settings » sparseStructure » steps

steps

integermin: 1max: 50default: 12

Number of denoising steps. More steps improve quality but increase generation time.

settings » sparseStructure » guidanceIntervalEnd

guidanceIntervalEnd

floatmin: 0max: 1default: 1

End of the sampling schedule fraction over which guidance is applied.

settings » sparseStructure » guidanceIntervalStart

guidanceIntervalStart

floatmin: 0max: 1default: 0.6

Start of the sampling schedule fraction over which guidance is applied.

settings » sparseStructure » guidanceRescale

guidanceRescale

floatmin: 0max: 1default: 0.7

Dampens oversaturation from high guidance values. Lower values apply more correction.

settings » sparseStructure » guidanceStrength

guidanceStrength

floatmin: 1max: 10default: 7.5

How closely the output follows the input image. Higher values enforce stricter adherence to the visible geometry.

settings » sparseStructure » rescaleT

rescaleT

floatmin: 1max: 6default: 5

Timestep rescaling factor for the sampling schedule. Controls how guidance strength is distributed across steps.

settings » texSlat

texSlat

object

Sampler for the Structured Latent stage that generates surface appearance.

Properties6 properties
settings » texSlat » steps

steps

integermin: 1max: 50default: 12

Number of denoising steps. More steps improve quality but increase generation time.

settings » texSlat » guidanceIntervalEnd

guidanceIntervalEnd

floatmin: 0max: 1default: 0.9

End of the sampling schedule fraction over which guidance is applied.

settings » texSlat » guidanceIntervalStart

guidanceIntervalStart

floatmin: 0max: 1default: 0.6

Start of the sampling schedule fraction over which guidance is applied.

settings » texSlat » guidanceRescale

guidanceRescale

floatmin: 0max: 1default: 0

Dampens oversaturation from high guidance values. Lower values apply more correction.

settings » texSlat » guidanceStrength

guidanceStrength

floatmin: 1max: 10default: 1

How closely the output follows the input image. Higher values enforce stricter adherence to the visible geometry.

settings » texSlat » rescaleT

rescaleT

floatmin: 1max: 6default: 3

Timestep rescaling factor for the sampling schedule. Controls how guidance strength is distributed across steps.

settings » textureFormat

textureFormat

stringdefault: WEBP

Texture format for the output mesh.

Allowed values2 values
settings » textureSize

textureSize

integermin: 1024max: 4096step: 1024default: 2048

Resolution of the output texture map in pixels. Higher values produce finer surface detail.