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Wrong Loft profile surfacing

6 REPLIES 6
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Message 1 of 7
cekuhnen
271 Views, 6 Replies

Wrong Loft profile surfacing

Looks like Fusion has a problem with lofting across cross sections correclty.

 

1 to 2 should be square to ring transition

2 to 3 should be ring to ring transition

 

but in image 1 you see that the space between 2 and 3 is reflecting the shape from 1.

 

In Rhino you see how I would expect this to work.

 

Screen Shot 2014-07-28 at 11.42.33 AM.png

 

 

Claas Kuhnen

Faculty Industrial Design – Wayne State Universit

Chair Interior Design – Wayne State University

Owner studioKuhnen – product : interface : design

6 REPLIES 6
Message 2 of 7
jeff_strater
in reply to: cekuhnen

Interesting case!  I will pass this on to our modeling folks for comment.  You might try splitting it into two lofts (one from the square profile to the first circle, and a second from circle edge to the second circle).  You will have to set the condition to "smooth" on the first circle.  Worth a try.

 

Jeff Strater (Fusion development).


Jeff Strater
Engineering Director
Message 3 of 7
cekuhnen
in reply to: jeff_strater

Same result when I do solid lofts in two steps.

Claas Kuhnen

Faculty Industrial Design – Wayne State Universit

Chair Interior Design – Wayne State University

Owner studioKuhnen – product : interface : design

Message 4 of 7
jeff_strater
in reply to: cekuhnen

OK, thanks for checking.  I've sent this off to our friendly modeling experts, let's see what they say.

 

Jeff


Jeff Strater
Engineering Director
Message 5 of 7
cekuhnen
in reply to: jeff_strater

Also when the loft at once produces a bad result
the two step version will produce something similar because of how
curvature flow is calculated in Fusion - just dawned to me.

Looking forward to a fix for this. This is a really basic surfacing function
and such tasks have to work without work arounds which are complicated
and time consuming ($$).

Claas

- - -

*Claas Kuhnen*


*(715) 513-9118 *
*www.ckbrd.de*
*info@ckbrd.de*

Claas Kuhnen

Faculty Industrial Design – Wayne State Universit

Chair Interior Design – Wayne State University

Owner studioKuhnen – product : interface : design

Message 6 of 7
jeff_strater
in reply to: cekuhnen

It turns out that the answer (to paraphrase a lot of stuff I don't understand), is that the loft will be influenced by all the profiles that are selected.  Our modeler has settings for controlling this (called "tilt angle" and "tilt weight", in case you are interested).  We currently expose these settings only at the start/end profiles of a loft (as "DirControl" under "Continuity" in the dialog).  To really fix this, we would need to expose this for middle profiles, too.  We'll put that on the list of improvements.

 

The workaround does work (two step loft), if you enable DirControl on the end of the first loft, and the beginning of the second loft.

 

Without DirControl:

loft without dir control 1.png

loft without dir control 2.png

 

two-stage loft with DirControl:

Loft 1:

loft with dir control 1.png

 

Loft 2:

loft with dir control 2.png

 

result:

loft with dir control 3.png

 


Jeff Strater
Engineering Director
Message 7 of 7
cekuhnen
in reply to: jeff_strater

I see - looking forward to fix this

Claas Kuhnen

Faculty Industrial Design – Wayne State Universit

Chair Interior Design – Wayne State University

Owner studioKuhnen – product : interface : design

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