When working with a 3d solid modeling solution like TopSolid, it is very important that you understand how its sketcher functions. Most 3d modeling solutions have one way to create and work with sketches. And that one way is supposed to fit every need you have.
The problem with that notion is that your needs change all of the time. The way you define geometry within a sketch needs to be completely flexible. What do I mean? Sometimes you may want to create a simple sketch, while other times you may want to create a really intelligent sketch. Perhaps you want to create a sketch that allows you to apply operations to it that really allow you to capture your design intent more cleanly. Thankfully for you, you use TopSolid and have the freedom to do both.
Understanding a sketcher
Let’s start by understanding what a sketcher is first. A sketcher allows you to create wire-frame based geometry. In TopSolid there is a 2d Sketcher and a 3d Sketcher. For this discussion, we will be focusing on the 2d sketcher.
A 2d sketcher allows you to create wire-frame on a specific plane. The sketcher environment at the solving level, allows you to define the sketch using dimensional relationships as well as geometric relationships. These are known as constraints. In the image to the right, you will see a sample of a constrained sketch. This image shows both dimensional and geometric constraints. Continue reading Sketcher: Constraint based sketch vs. sketch operations