Hello everyone, during loft feature I got a twist (Image.2) beetween two sketches (image.1). How can avoid it?
Even though in the loft feature it has you select "profiles" you are actually selecting a corner.
Edit the loft, kill the profiles selected in there and select two points that you want to loft to each other - make sure they are points. See attached pic for example.
When ever I have done lofts I was told to make sure all of my sketches that were used in the
loft have the same amount of segments. When I was told that years ago I have done it with great success
and it eliminated the twists.
I make all of my sketches with one entity by using the following tool.
Under the Spline toolbar there is a command called "Fit Spline"
This command basically like convert entities in that it takes the existing segments and make them
one. Make sure when you do this the first segment selected in the first sketch should be the same
segment in the same corresponding location of the next sketch. For example if both sketches are
squares the first one selected is the left vertical, so the left vertical is the first one selected in the
second sketch as well.
This has worked for me.
Thank you Scott, I didn't knew that. In the current loft, each of the sketches was apart from the same amount of segmets, but your advice should be very helpful for my next projects since sketches are more complex.
Beautiful! It worked. Thank you everyone for your advices. Much appreciated.
I think the twist looks kind of cool
I agree, I vote for leaving the twist in.
Also, paying attention to where and how your connectors are placed is what will cause or eliminate twists.
Right click on the preview of the loft (while the tool is open), and select "show all connectors".
Then you can move your connectors until everything looks right. Fit Spline works well when you can use it, but often it creates unsuitable geometry. Readjusting your connectors would be the "proper" way to fix it. SW makes assumptions that are sometimes wrong, and hand adjusting the connectors corrects those assumptions. "Always using profiles with the same number of segments" is just a way to help SW overcome its connector assumptions. It is not required if you hand adjust the connectors afterwards.
I also don't love the method of using a fit spline for everything, because it makes one big smooth (periodic) curve.
Which can be less flexible for downstream modeling, depending on what you plan to do.
I typically use guide curves to control twist. The connectors do not snap to the geometry so with changes they may wander. I hope this helps.
Adjusting the connectors is certainly the best way to approach lofts, especially when dealing with different number of segments. The connectors are available in many different features such as Boundary Surfaces. You can choose not to use the entire curve or curves selected so you can "snap" to other geometry. Depending on the desired end result, the connector location adjustments will be neccessary. Understanding and playing with the available options is a very powerful tool when dealing with this type of geometry and you can create some very complex and stable parts with very little in the way of guide curves or median loft cross sections.
Hi, got any suggestions when I get the twist when trying to follow my guidelines?
It looks like your guide line is in the center of each profile. Use this sketch in the center line drop down box instead of the guide curve selection box.
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