What kinds of dimension constraints does Revit use?

What are Revit constraints?

Constraints build intelligence into the model, defining relationships and interdependencies between elements. Create constraints by applying locked dimensions and alignments, or attaching elements together (such as walls and roofs).

What are dimension constraints?

Dimensional Constraints control the distance, length, diameter, radius, and angle values of entities. Changing the value of Dimensional Constraints changes the dimension of the related entities.

How do you use constraints in Revit?

Lock a permanent dimension to create a constraint. When you place a permanent dimension, you can click the lock icon for the dimension and create a constraint. A constraint (dashed blue line) appears when you select its references, as shown in the following image.

How many dimensions are there in Revit?

There are 2 types of dimensions: Temporary dimensions are the measurements that display in the drawing as you place elements or sketch lines, or when you select an element. These dimensions disappear when you complete the action or deselect the element.

How do you change level constraints in Revit?

Reveal Constraints

1. On the View Control Bar, click (Reveal Constraints). …
2. Select a constraint to highlight the elements that are constrained. …
3. Optional: Remove the constraint by simply deleting it, or by unlocking it. …
4. On the View Control Bar, click to exit Reveal Constraints mode.

What are the types of geometric constraints?

For example, the Fix, Horizontal, and Vertical Geometric Constraints act on a single entity, whereas Perpendicular, Parallel, Tangent, and others control two entities.

What are the two major types of constraints used in 3d modeling?

There are two constraints: the distance and angle between geometric elements. These correspond to dimensions in drawings.

What two basic types of constraints are used to control features?

There are two types of constraints: geometric and dimensional.

How do you remove a constraint dimension in Revit?

Remove Constraints

1. Select a dimension.
2. Do any of the following: Click a lock to unlock it. Click the EQ symbol to remove an equality constraint. The EQ symbol appears with a slash through it when the equality constraint is not applied. Delete the dimension that corresponds to the constraint.

How do I add a constraint in Revit family?

Constrain Family Geometry

1. Use the Align tool and select the specific reference plane and the sketch line to establish the constraint.
2. When the lock symbol displays, click it to lock the constraint.

Why are dimension not showing in Revit?

Causes: This can occur for multiple reasons: Multiple elements are selected. If it takes more than 200 milliseconds for Revit to calculate the temporary dimensions, when selecting an element, then to maintain good performance Revit will abort this calculation and the temporary dimensions will not be displayed.

How do you set dimensions in Revit?

Change a Dimension Value

1. Select an element that the dimension references.
2. Click the dimension value. If the dimension is locked, the lock control appears next to it. …
3. In the edit box, type a new value for the dimension, and press Enter . The element moves to satisfy the new dimension requirement.