Autodesk Inventor 2018 - iLogic – Change iPart Member

This video explains how to adjust the iPart member in an iPart family, based on an assembly parameter. This example shows how to adjust a draw.

Are you an iLogic or an iPart person? Well they’ve each got their place – iLogic certainly allows greater flexibility, whereas iParts just can’t be beaten for catalogues of part numbers for standard parts. But did you know they’re not mutually exclusive? You definitely can’t include embedded iLogic in your iParts, but if you want to incorporate a few cheeky iParts in your iLogic assemblies that’s no problem.

My key tip for this would be some sensible naming for the member names of your iPart. This should allow you to avoid having a very long ‘If’ statement choosing between different iPart members, and should just allow you to concatenate the name of the iPart member you need based on assembly parameters.

Also, whenever you’re switching between a finite number of options, there is always a chance that someone will select an option that isn't available. Therefore, I’ve included a helpful error message, telling the user what iPart members are available, instead of simply telling them they’ve picked one that isn’t permitted.

Watch the video below to find out how this works.

Note: the below video was created by Excitech prior to becoming Symetri in January 2021, following its acquisition by Addnode Group. All Excitech products, services and solutions mentioned in this recording are available through Symetri.

You can download the example iLogic code here.


5 Ways Chaos Is Using AI to Transform Design Visualisation

28 January 2026

Artificial intelligence is reshaping the way Architects, Designers, and Visualisation professionals bring ideas to life. Chaos, a global leader in rendering and visualisation technology, is at the forefront of this transformation. By integrating AI into its ecosystem of tools - Veras, Enscape, V-Ray, Corona, and Vantage - Chaos is streamlining workflows, accelerating creativity, and redefining what’s possible in design visualisation. This blog explores 5 ways Chaos solutions are supporting AI technology.

Chaos V-Ray vs Chaos Corona: Which Renderer Fits Your Workflow?

21 January 2026

Visualisation has changed dramatically over the past twenty five years. With so many powerful tools now available, choosing the right rendering engine has become a crucial decision for architects, designers, and visualisation specialists. Among the leading options, Chaos offers two standout solutions - Chaos V-Ray and Chaos Corona - each delivering exceptional photorealism in its own way. This blog outlines how they compare.

Including Visualisation as Part of Your BIM Strategy

19 January 2026

I am sure we have all heard the question “are you a visual learner” at some point, this is because today there is a greater appreciation that most of us learn and understand the world around us, including new concepts more easily via visuals.