This project will show you how to create parametric table and chairs blocks, with visibility states. This tutorial is split into two parts: a circular table and a rectangular table. These are practical projects, designed to help get you started with 2D parametric drawing, nested blocks and visibility states in BricsCAD. In this post, learn how to create a circular table.
This project will cover:
- How to add constraints to a 2D drawing
- How to create and edit the value of parameters
- Simple animation of constraints and parameters
- Working with visibility states
- How to use a design sheet (Excel, Google Docs or similar) to create design variations
Before we begin…
- If you need to manually enter a value during the exercise, it will be shown in green.
- All dimensions are shown in mm however you can use any unit you like.
- 2D Geometric Constraints and 2D Dimensional Constraints are located in The Parametric tab of The Ribbon.
- You must have an understanding of how to draw basic shapes in BricsCAD. If you are not yet familiar, please see our Beginner CAD Course.
- These are the chair blocks used for this project.
Quick guide to terminology:
- Parameter – defines the position, distance, and angle of geometry
- Constraint – a rule: position, slope, tangency, dimension, and relationship of geometry
- Expression – formula or absolute value of a parameter or constraint
Time to complete: 30 mins
Create a circular table and chairs:
- Draw a circle with a radius of 100. This will be the table.
- Add a Fix Constraint to the center of the table.
- Insert a chair, as a block in line with the top quadrant of the table.
- Use ARRAYPOLAR on the chair. Use the center point of the table as the center of the array.
- Repeat steps 3-4 with two other chairs.
- Add a radius constraint to the table.
- In the Mechanical Browser, add two new parameters. Right-click Parameters and choose Add New Parameter from the drop-down menu.
- In the Mechanical Browser, click on the parameters and change the value of the parameters in the bottom of the panel:
(for the size of the table)
(for the number of chairs in relation to the table size)
- Change the rad1 parameter Expression to r.
- In the Mechanical Browser, click on the arrays and edit the value at the bottom of the panel:
Angle between items: 360/i
You should now have something that looks like this:
- In the Mechanical Browser, right-click the r parameter and select Animate from the drop down menu.
- Enter VISIBILITYSTATES. A dialog box will display.
- Click New Parameter and give it a name.
- Right-click the Parameter and select Add State.
- Repeat step 14, two more times. Name them Economy, Mid, and Premium.
- Select one of the visibility states.
- Right-click and use the Select invisible entities/Select visible entities options to hide and show the table and correct chair arrays for each state.
- Select the next visibility state.
- Rick-click and select Show invisible.
- Repeat steps 16-19 for the remaining visibility states.
- Rick-click and uncheck Show invisible, to hide the entities.
- Try clicking on the different visibility states to see what happens.
If you have completed all the steps above, you should now have something like this:
Come back next time and learn how to create a parametric table and chairs arrangement, with variable spacing.
Get started using 2D parametric blocks in BricsCAD
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