Constraints help you to create accurate, precise sketches easily.

**Using constraints**

In Shapr3D you only have to keep yourself to a small set of rules to use our constraints efficiently.

**Just start sketching:**You can access the constraints in the**Sketching**menu, just select any sketch and the Menu will appear.**Always pre-select**: Select the lines, points, arcs, circles first and only then add the constraints. Simple as that.**Other tools in the constraints menu:**Trim and Offset are not constraints, but they are used with sketches.**Dimension & Auto-lock:**Tap on any line, circle or combination of points and give them length, radius or create a distance between them. These dimensions will be auto-locked.

**TIP: Create a rough sketch first and only then add constraints. This workflow will make your job easier!**

**How can I delete constraints?**

- Select the sketch you want to change
- Tap on the constraint icon you want to delete
- Tap on the "X"

**List of available constraints:**

**Parallel: **It makes 2 or more lines parallel to each other.

**Perpendicular: **It creates a 90**° **connection between 2 or more lines. The lines don't have to share a common point or cross each other.

** Tangent: **You can make a circle&circle; line&circle and a line&line tangent to each other.

**Concentric: **It makes two or more circles share their center point.

**Horizontal / Vertical: **This command will make your lines parallel to the X or Y axis of the sketch plane, whichever takes fewer adjustments.

**Equal: **Makes your lines the same length and your circles having the same radius.

**Lock: **Simply locks your points. Select any number of lines, circles or points and this tool will lock all the points related. Locking a single point can be achieved by selecting the point and tapping on the lock icon on top of it.

**Symmetry: **Makes your lines, circles or points symmetric to each other, in relation to a given axis.

- Lines: Their vectors will be mirrored to a given axis
- Circles: Their radius will be the same, and their center point will be on the same imaginary line, perpendicular to the axis of symmetry.

Note: if you apply the symmetry constraint on your lines, it won't make the end points of the lines symmetric, only the lines.

**Dimensions **

There are multiple dimensions you can control by simply tapping on the sketch you want to change, and entering the right dimension. Here are the options you have:

- length: select a line, tap on the annotation and enter a value

- radius: select a circle or an arc, tap on the annotation and enter a value

- distance: select the points you want to dimension, choose from the distance types: horizontal, vertical or absolute and enter a value.

- angle: you can set the angle between any two connected curves. You can modify this angle by selecting the two lines/arcs, tapping on the annotation and entering the final angle.

- Point-Point distances: Define the distance by two points by selecting them, and entering the desired length. 3 different distances are available:

- Absolute
- Horizontal
- Vertical

- point-line distances: Define the length between a point and a line

**Tutorial**

In this video you can learn how to use all the tools in this article, and with that how to finish up your sketches.

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