Hide Table of Contents

Differences Between 2D and 3D Sketching

With 2D sketching, all geometry is projected onto the plane you selected to sketch. Silhouette edges become planar entities, so that from certain angles, fillets and cylinders appear as arcs and lines.

In the sketch below, though you do not view normal to the sketch plane, you can still perceive how the model is projected onto the sketch plane.
In a 2D sketch, model geometry is projected onto the sketch plane in this manner.

In the sketch below, the 3D sketch in red (created on one of the edges of the chamfer) is a model edge that is not parallel to the 2D sketch plane. The 2D sketch in red is a projection of the 3D sketch.

In the 2D sketch, you can sketch a line that is parallel to other lines and add end points that are coincident. However, parallel and coincident refer to the projected edge and not the real edge. The 2D sketch in blue represents this condition. The end of the line is not coincident with the real model edge, nor is the line parallel to it.
In 3D sketching, there are no such projections. If you add a parallel relation to the red 3D sketch, it is parallel in 3D space.
In 3D sketches with nested contours, you can select the internal boundaries, but their profiles are not subtracted from the overall extrusion as is the case in 2D sketches.

Provide feedback on this topic

SOLIDWORKS welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. Use the form below to send your comments and suggestions about this topic directly to our documentation team. The documentation team cannot answer technical support questions. Click here for information about technical support.

* Required

Subject:   Feedback on Help Topics
Page:   Differences Between 2D and 3D Sketching
*   I acknowledge I have read and I hereby accept the privacy policy under which my Personal Data will be used by Dassault Systèmes

Print Topic

Select the scope of content to print:


We have detected you are using a browser version older than Internet Explorer 7. For optimized display, we suggest upgrading your browser to Internet Explorer 7 or newer.

 Never show this message again

Web Help Content Version: SOLIDWORKS 2013 SP05

To disable Web help from within SOLIDWORKS and use local help instead, click Help > Use SOLIDWORKS Web Help.

To report problems encountered with the Web help interface and search, contact your local support representative. To provide feedback on individual help topics, use the “Feedback on this topic” link on the individual topic page.