## Question

**What are Tangential, Parallel, and Sweep Lock options?**

## Answer

**Tangential, Parallel, and Sweep Lock options allow you to generate a variety of 3D-shapes.****You can control it by setting the constraint of the cross section that creates the shape along the path.**

Assume that there are cross sections and paths as follows.

Create a 3D-shape according to the option, as shown in the table below.

## [Advance] Lock Option: Description of Direction

Let's look at how features are created in three identical paths along the direction of the **Lock Direction.**

Step1.

** **Find the **Cross product** of **Path Tangent** and **Lock Direction**.

Step2.

** **Generate the final shape by placing the cross section on the three axis space formed by the **Path Tangent** and the **Cross product**.

## [Advance] Lock Option: Description of Path&Direction

Let's look at how features are created in three identical paths along the direction of the **Lock Direction.**

Step1.

** **Find the **vector** for the **Path Tangent** projection on a plane with the **Lock Direction** as its axis.

(The subsequent process is the same as the Directions option.)

Step2.

** **Find the **Cross product** of **projected vector** and **Lock Direction**.

Step3.

** **Generate the final shape by placing the cross section on the three axis space formed by the **Path Tangent** and the **Cross product**.