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Fill Surface and constraint curves

Question asked by Tom Russell on Jun 26, 2014
Latest reply on Jun 28, 2014 by Peter Hunstein

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Hi,

I'm attempting to create a surface model based on a foam model that I have created. I am having trouble creating the top surface.

My process so far:

1. create 3D curve (using projected curve, sketch on sketch, based on pictures of the foam model) to define surface boundary

2. create 3 constraint curves

3. Create fill surface: here is my problem, while the feature does build, the resulting geometry is super wacky and not symetrical.

Anyone have any ideas as to how to remedy this problem?

Attached is the SW model and an image that may help to explain what i am trying to achieve. (I want the surface to be smooth over most of it but have a slight sharp trailing edge)

Cheers,

Tom

Jamil Snead Jun 26, 2014 2:19 PM

Correct Answer

I think you'll need to break it up into two sections. This will require new sketches where you convert parts of the existing curves. First do the back portion where you do not need it continuous:

Then do the front portion. When you select the top arc where you want it continuous set it to "Normal To Profile", and when you select the edge of the surface you already created set it to "Tangency To Face".

Then if you knit the surfaces and mirror them you will see it is continuous.

See the reply in context

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Surfacingmaster.SLDPRT.zip6.3 MB
IMG_0597.JPG1,019.4 KB

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Jamil Snead Jun 26, 2014 12:08 PM

Usually when modeling a symmetrical part is is easier to do half first and then mirror it all at the end. So for starters on your part I would trim all of your sketches to be on one side only. Then I had more success using a Boundary Surface for the top. See if that works for you.

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Tom Russell @ Jamil Snead on Jun 26, 2014 1:47 PM

Ah I see, that makes sense, thanks for the tip. I succesfully managed to get the boundary surface to build but after mirroring the surface, the front of the part is not curvature continous, do you know of any ways to do this?

Thanks,

Tom

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Jamil Snead @ Tom Russell on Jun 26, 2014 2:19 PM

I think you'll need to break it up into two sections. This will require new sketches where you convert parts of the existing curves. First do the back portion where you do not need it continuous:

Then if you knit the surfaces and mirror them you will see it is continuous.

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Mark Biasotti @ Jamil Snead on Jun 27, 2014 2:16 PM

Jamil,

Fill surface rarely works well with two or more constraint curves - period. The key to getting Fill surface to work correctly is t do well-crafted reference surfaces at the boundaries of the fill surface in order to "guide" the flow of the Fill.

Mark

Attachments

fill-surface-example.SLDPRT.zip315.8 KB

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Tom Russell @ Jamil Snead on Jun 27, 2014 10:20 AM

Thanks so much for that, that seems to have done it

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Piotr Regula Jun 26, 2014 12:09 PM

Filled surface is not the best feature for what you are tying to do.

Boundry surface works much better.

I would send you the file but I have a newer version of SW so i doubt you'll be able to open it.

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Mark Biasotti @ Piotr Regula on Jun 27, 2014 2:18 PM

With all due respect, this is actually a very bad implimentation of Boundary for this solution. By creating a Boundary where 1st or 2nd direction curves endpoints meet each other, while creating a surface will create a surface with de-generate end point - that most probably will not shell.

Regards

Mark

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Douglas French @ Mark Biasotti on Jun 27, 2014 5:07 PM

Agreed. Overbuild the surface with 4 sides and trim it back to the curved shape.

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Peter Hunstein @ Douglas French on Jun 28, 2014 9:45 AM

I'm trying to do this right now and have a question. How do you creat the end guide curves so that the surface curvature would match what you would get with just the 2 boundry curves? What I mean is, you have to seperate the two boundry curves with end guide curves (though I understand that seperation can be small) to create a 4 sided surface. If you have two 3D boundry curves that meet at a point Mine were created by projecting two 2D sketches to create a projected curve) how do you add a curve between them and still maintain the privious shape? What is the method for offsetting the boundry curves so that you can sketch giude curves between them? Am I making sense?

Thanks

Peter~

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9 Replies

Jamil Snead Jun 26, 2014 12:08 PM
Mark Correct
Correct Answer
Usually when modeling a symmetrical part is is easier to do half first and then mirror it all at the end. So for starters on your part I would trim all of your sketches to be on one side only. Then I had more success using a Boundary Surface for the top. See if that works for you.
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- Tom Russell @ Jamil Snead on Jun 26, 2014 1:47 PM
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  Ah I see, that makes sense, thanks for the tip. I succesfully managed to get the boundary surface to build but after mirroring the surface, the front of the part is not curvature continous, do you know of any ways to do this?
  
  Thanks,
  Tom
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  - Jamil Snead @ Tom Russell on Jun 26, 2014 2:19 PM
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    Correct Answer
    I think you'll need to break it up into two sections. This will require new sketches where you convert parts of the existing curves. First do the back portion where you do not need it continuous:
    
    Then do the front portion. When you select the top arc where you want it continuous set it to "Normal To Profile", and when you select the edge of the surface you already created set it to "Tangency To Face".
    
    Then if you knit the surfaces and mirror them you will see it is continuous.
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    - Mark Biasotti @ Jamil Snead on Jun 27, 2014 2:16 PM
      Mark Correct
      Correct Answer
      Jamil,
      
      Fill surface rarely works well with two or more constraint curves - period. The key to getting Fill surface to work correctly is t do well-crafted reference surfaces at the boundaries of the fill surface in order to "guide" the flow of the Fill.
      
      Mark
      Attachments
      fill-surface-example.SLDPRT.zip315.8 KB
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- Tom Russell @ Jamil Snead on Jun 27, 2014 10:20 AM
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  Thanks so much for that, that seems to have done it
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Piotr Regula Jun 26, 2014 12:09 PM
Mark Correct
Correct Answer
Filled surface is not the best feature for what you are tying to do.

Boundry surface works much better.

I would send you the file but I have a newer version of SW so i doubt you'll be able to open it.
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- Mark Biasotti @ Piotr Regula on Jun 27, 2014 2:18 PM
  Mark Correct
  Correct Answer
  With all due respect, this is actually a very bad implimentation of Boundary for this solution. By creating a Boundary where 1st or 2nd direction curves endpoints meet each other, while creating a surface will create a surface with de-generate end point - that most probably will not shell.
  
  Regards
  
  Mark
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  - Douglas French @ Mark Biasotti on Jun 27, 2014 5:07 PM
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    Agreed. Overbuild the surface with 4 sides and trim it back to the curved shape.
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    - Peter Hunstein @ Douglas French on Jun 28, 2014 9:45 AM
      Mark Correct
      Correct Answer
      I'm trying to do this right now and have a question. How do you creat the end guide curves so that the surface curvature would match what you would get with just the 2 boundry curves? What I mean is, you have to seperate the two boundry curves with end guide curves (though I understand that seperation can be small) to create a 4 sided surface. If you have two 3D boundry curves that meet at a point Mine were created by projecting two 2D sketches to create a projected curve) how do you add a curve between them and still maintain the privious shape? What is the method for offsetting the boundry curves so that you can sketch giude curves between them? Am I making sense?
      
      Thanks
      
      Peter~
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Fill Surface and constraint curves

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