Autodesk Alias Tutorials I Q&A 19 - Fillet over Fillet

[@tinydiccbandito4953]

Damn that is impressive. I am coming from rhino as I feel I might have hit a wall with its surfacing capabilities so I wanted to learn alias. But there are so many more factors taken into consideration here that I am having a hard time trying to keep up with what's happening. Any tips?

[@iiTunz]

May want to check out the Cyberstrak plugin if you want to expand the surface capabilities of rhino.

[@3DDesignAcademy]

Thank you! Well, there are several principles that one needs to be aware of, but like you said, there are a lot of factors and exceptions to consider. I might try to make a video that focuses on general guidelines when putting fillets in.

[@prahar112]

What is the rational flag surface?

[@3DDesignAcademy]

Rational flags, when checked on, allows you to create a perfect circle. The circles and/or cylinders in Alias, by default, are not perfect circles which means they have varying radius all the way around. They also have a different cv structure. You may want to see this for the difference between the two. kzbin.info/www/bejne/q3WvkKSmfrmqpqs That said, I thought this was made with rational flags on, but it looks like it's just got multiple spans.

[@prahar112]

Just watched the video, well what to say. This explains a lot about why my wheel was off when i did the duplicate coz according to my understanding its like a pattern and I should not be worried since its based on degrees and i trimmed the surfaces with the correct segments. I should not have done that but it does. Also i don’t understand why there was a option of rational surfaces on or off, shouldn’t it be like that all the time? I mean whats the use of imperfect circle? Is there any use case scenario?

[@3DDesignAcademy]

@@prahar112 Yes there is a use case for that. In fact, you should only use perfect circles only when you need to have one, such as creating a wheel. Otherwise, you should stick to regular circle, because working with a rational flag circle is actually difficult. For example, if you try to extend the edge, it becomes broken.

[@prahar112]

I see, that makes sense. Thank you

[@3DDesignAcademy]

@@prahar112 You're welcome!