Sketching in Shapr3D

Sketching is the foundation of 3D modeling in Shapr3D. You can create precise 2D sketches that define the shape and structure of 3D bodies. With constraints, dimensions, and snapping options, you can accurately control your geometry and maintain design intent.

Shapr3D’s sketching and modeling workflow follows familiar CAD principles while offering a more intuitive and streamlined experience. You can directly interact with geometry and apply constraints or dimensions as needed. This approach simplifies creating and modifying 3D bodies with tools like Extrude (commonly known as the Push/Pull method), Loft, and Revolve, allowing you to refine designs efficiently while keeping sketches adaptable for future modifications.

Understanding sketch items

Sketches in Shapr3D consist of various 2D items, including lines, arcs, circles, and splines. These items can be freely drawn or precisely defined using numerical input, constraints, and dimensions.

When creating sketches, it's important to distinguish between:

• Closed sketches – Fully enclosed shapes that can be extruded, revolved, or used as cut profiles.
• Open sketches – Unenclosed shapes that can be used for sweeps, guide rails, or projected curves.

Sketch constraints, dimensions, and sketch states

Sketches in Shapr3D can be precisely controlled using constraints and dimensions. These tools help maintain relationships between sketch items and ensure accuracy in your designs.

Constraints

Constraints define geometric relationships between sketch items. They automatically adjust the sketch when modifications are made, maintaining consistent proportions and alignment.

To learn more, visit Constraints overview.

Dimensions

Dimensions specify exact measurements for sketch items, such as lengths, angles, and distances. Adding dimensions allows you to define precise values, ensuring your sketches remain accurate and scalable.

To learn more, visit Defining and calculating numerical values.

Sketch states

The state of a sketch indicates whether it is fully constrained or still has undefined elements. 

In Shapr3D, sketches can be in one of two states:

• Fully-defined: A fully-defined sketch has all its geometric relationships and dimensions constrained, preventing any sketch items from moving independently. The sketch remains fixed unless a constraint is removed, a dimension is modified, or a parameter is adjusted.
• Under-defined: An under-defined sketch has sketch items that are not fully constrained, allowing them to move or change size. You can apply additional constraints and dimensions to control the geometry and fully define the sketch.

Sketching workflow

When sketching in Shapr3D, follow these general steps:

1. Select a sketch plane or face to draw on.
2. Use sketch tools like Line, Circle, or Spline to create the desired geometry.
3. Apply constraints and dimensions to define relationships.

Using sketches to create 3D bodies

Once a sketch is complete, you can turn it into a 3D body using Shapr3D’s modeling tools. For example, use Extrude to add depth to a shape, or use Revolve to create cylindrical or spherical shapes, such as bottle bodies, shafts, or rounded enclosures.

Sketches also play a key role in more complex workflows:

• Loft and Sweep: Use sketches as profiles and guide curves to create smooth, organic shapes for ergonomic grips or fluid containers.
• Offset and Projection: Generate precise outlines by offsetting existing sketches or projecting edges onto new planes.
• Cutouts and Details: Create cut features like vent openings, custom engravings, or embossed text directly from sketches.
• Construction Geometry: Use sketches to define centerlines, reference curves, or alignment guides for precise feature placement.

To learn more about the available Shapr3D tools for creating 3D bodies, visit the Tools menu.