GDnT

GDnT represents a single geometric dimensioning and tolerancing callout extracted from a drawing. The model bundles the controlled characteristic, the tolerance zone, feature modifiers, the reference element, material condition, state, and the datums referenced by the frame, giving you a holistic view of how form, fit, and function are controlled. It serves as the root structure that connects the individual GD&T components so downstream software can analyze them together, determine compliance with standards, or simulate permissible variation. The object also stores the raw label and a detection confidence, supporting auditability. Use this object when you need to extract the complete GD&T schema for digital twin analysis, inspection planning, process capability studies, or change management across drawing revisions.

Bases: Feature

Represents a GD&T (Geometric Dimensioning and Tolerancing) cue in a technical drawing.

PARAMETER	DESCRIPTION
`reference_id`	Reference ID to identify the object. TYPE: `int`
`label`	A short description of the feature in a human-readable format. TYPE: `str`
`confidence`	Confidence in the feature extraction or interpretation. TYPE: `Confidence \| None`
`characteristic`	The GD&T characteristic being controlled (e.g., flatness, circularity). TYPE: `GDnTCharacteristic`
`zone`	The tolerance zone defined for the characteristic. TYPE: `GDnTZone \| None`
`feature`	The feature being controlled by the GD&T characteristic. TYPE: `GDnTFeature \| None`
`reference`	The reference for the GD&T characteristic. TYPE: `GDnTReference \| None`
`material_condition`	Material condition (e.g., maximum material condition). TYPE: `GDnTMaterialCondition \| None` DEFAULT: `None`
`state`	State of the feature (e.g., free state). TYPE: `GDnTState \| None` DEFAULT: `None`
`datums`	List of datums used as references for the GD&T characteristic. TYPE: `list[GDnTDatum]` DEFAULT: `<dynamic>`

Source code in werk24/models/v2/models.py

class GDnT(Feature):
    """
    Represents a GD&T (Geometric Dimensioning and Tolerancing) cue in a technical drawing.
    """

    characteristic: GDnTCharacteristic = Field(
        ...,
        description="The GD&T characteristic being controlled (e.g., flatness, circularity).",
    )
    zone: Optional[GDnTZone] = Field(
        ..., description="The tolerance zone defined for the characteristic."
    )
    feature: Optional[GDnTFeature] = Field(
        ..., description="The feature being controlled by the GD&T characteristic."
    )
    reference: Optional[GDnTReference] = Field(
        ..., description="The reference for the GD&T characteristic."
    )
    material_condition: Optional[GDnTMaterialCondition] = Field(
        None, description="Material condition (e.g., maximum material condition)."
    )
    state: Optional[GDnTState] = Field(
        None, description="State of the feature (e.g., free state)."
    )
    datums: list[GDnTDatum] = Field(
        default_factory=list,
        description="List of datums used as references for the GD&T characteristic.",
    )