All classes Dynamo for Revit Intermediate Syllabus · Episode 2 of 7

Dynamo for Revit Intermediate #9: Logic and Element Filtering

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Episode nine of the Dynamo for Revit series: logic, true/false masks, and filtering elements with FilterByBoolMask. Content: Comparison operators and true/false results; Creating a mask from wall area; List.FilterByBoolMask; Complete Revit course from zero to expert (BIM); Script creation services for Dynamo & BIM Revit modeling; A two-story house project file (.rvt) is available. Complete with PDF steps and files

Software: Revit 2027 + Dynamo
Level: Intermediate
Duration: ± 4 min
Series total: 33 min · 7 videos
Published: October 15, 2026

Episode 2 of 7 · view syllabus

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Transcript

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Introduction

In this episode, we learn how to filter elements using logic. We will take only walls that are larger than 20 square meters. Let's start. Hello. In episode 9, we learn about logic and filtering in Dynamo.

Step 1: Open Dynamo from the Manage tab in Revit

Open Dynamo from the Manage tab in Revit, then click Launch Dynamo. Wait until the window opens.

Step 2: Create a new workspace with the New button

On the initial page, click New to create an empty workspace. Comparison operators produce True or False.

Step 3: Comparison operators produce true or false

The list 5, 12, 8, 20, 3 compared with greater than 8 results in False, True, False, True, False for each item.

Step 4: Get all walls and read their area

Take all walls, right-click, find Categories, select Walls, then All Elements of Category. Then read the area using Code Block Area and Node Get Parameter Value by Name. Create a Code Block containing A greater than 20.

Step 5: Create a mask - walls with area greater than 20

Connect the area list to port A. The result is a list of True and False, called a Mask, where True represents walls larger than 20.

Step 6: Filter with List.FilterByBoolMask, the count appears in Watch

Add the node list.filter by Ball Mask. Connect the wall list and the Mask. The first output contains the walls that pass the filter. Connect it to Watch, and the number in the bottom right corner of Watch shows the count of walls larger than 20. Done.

Done! Elements can be filtered with logic

You now know how to filter elements using logic. In the next episode, we will automatically number doors and windows. Goodbye. Want to master Dynamo and Revit? Cerdas Inovasi Digital offers Revit and Dynamo courses, BIM modeling and script creation services for Dynamo, as well as selling project files and Dynamo grabs from this tutorial series. Contact us via WhatsApp, or visit cerdasinovasidigital.com See you in the next episode.

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Transcript

0:03Introduction

0:22Step 1: Open Dynamo from the Manage tab in Revit

0:53Step 2: Create a new workspace with the New button

1:11Step 3: Comparison operators produce true or false

1:33Step 4: Get all walls and read their area

2:33Step 5: Create a mask - walls with area greater than 20

2:55Step 6: Filter with List.FilterByBoolMask, the count appears in Watch

3:29Done! Elements can be filtered with logic

Ask the class material

My notes

Questions & answers

Your instructor

Recommended classes for you

Need more than a video?

Transcript

0:03Introduction

0:22Step 1: Open Dynamo from the Manage tab in Revit

0:53Step 2: Create a new workspace with the New button

1:11Step 3: Comparison operators produce true or false

1:33Step 4: Get all walls and read their area

2:33Step 5: Create a mask - walls with area greater than 20

2:55Step 6: Filter with List.FilterByBoolMask, the count appears in Watch

3:29Done! Elements can be filtered with logic

Ask the class material

My notes

Questions & answers

Your instructor

Introduction

Step 1: Open Dynamo from the Manage tab in Revit

Step 2: Create a new workspace with the New button

Step 3: Comparison operators produce true or false

Step 4: Get all walls and read their area

Step 5: Create a mask - walls with area greater than 20

Step 6: Filter with List.FilterByBoolMask, the count appears in Watch

Done! Elements can be filtered with logic

Introduction

Step 1: Open Dynamo from the Manage tab in Revit

Step 2: Create a new workspace with the New button

Step 3: Comparison operators produce true or false

Step 4: Get all walls and read their area

Step 5: Create a mask - walls with area greater than 20

Step 6: Filter with List.FilterByBoolMask, the count appears in Watch

Done! Elements can be filtered with logic