cad sketch

what is a CAD sketch

In CAD, you can use the Sketch tools to create the sketch profiles that drive the shape of solid, surface, and T-Spline bodies in your design. Sketches are the underlying geometry that support the creation of 3D solid, surface, and T-Spline bodies in your design.

Sketch is a geometric profile that forms the foundation of 3D geometry in a design .

Before you can create 3D objects in your design, you first need to create the underlying sketch profiles that drive the overall shapes of the parametric solid, surface, or T-spline bodies that make up your design. Sketches are the backbone of any subsequent parametric modeling. If you create a robust sketch profile, you can improve your workflow and minimize potential downstream issues in your design.
You can create sketches on a plane or existing planar face on a body, and create geometry in relation to the XYYZ, and ZX planes, or at any arbitrary point in 3D space.

Types of geometry

You can create several different line types you can use as you create geometry in a sketch.

Geometry TypeDescription
Sketch GeometryThe default line type used to create geometry in a sketch.

Contributes to the sketch profile.

Displays as a solid blue line when unconstrained.
Construction GeometryA line type used as a reference for sketch geometry, constraints, and dimensions.

Does not contribute to the sketch profile.

Displays as dashed orange geometry when unconstrained.
Centerline GeometryA line type used to revolve sketch profiles or define symmetry.

Contributes to the sketch profile.

Displays as dashed orange centerline geometry when unconstrained.
Projection GeometryAn associative reference to profiles of 2D or 3D geometry from outside the sketch that are projected onto the sketch plane.

Contributes to the sketch profile.

Displays as purple geometry.

Updates to reflect changes you make to referenced geometry.
Fixed GeometryAny sketch, construction, or centerline geometry that you’ve locked in place with the Fix/Unfix constraint.

Contributes to the sketch profile.

Displays as green geometry.

Use the Fix/Unfix constraint to unlock fixed geometry if you need to edit or move it.

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