Reconstruct a volume from a face

3D Design Surface Modeling
1

Hello, I have a little puzzle to offer you, and its resolution would help me a lot for my future projects.

Question: What would be your approach if you had to recreate/recover this torus with only a portion of its surface as a reference? (It is assumed that the volume is not aligned with the original plans)

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Surface fragment. WWTP (17.3 KB)

2

Can you supply the part in Step or earlier 2022?

1 Like
3

I added him to the post!

4

Extend the surfaces, but we need less complex shapes, there they will intersect

5

Surface fragment. WWTP (8.0 KB)

If it works
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6

Well congratulations and thank you! I had the same intuition as you about the interweaving of surfaces, so I had never tried to push the function to the point of recovering the entire geometry, but it seems that the function is more robust than I thought.

I have another question that arises from this: The function gives us back the complete geometry of the volume but in the form of a surface. The " sew" function with the " create volume " option apparently does not work on a single surface. Are we therefore obliged, in order to recover the volume of our torus, to go through an encompassing volume and then to cut it thanks to the surface thus created?

7

Hello,

To create volume, there must be no holes in the surface.
In the step made available by @FRED78 there remains an unclosed surface.

image

8

Even if you fill in the hole, the " Stitched Surface" function shows you this message:
image

NB: I just found the solution by writing this message, you have to use the " Thicken " function with the option " Create a solid from the closed volume"

9

Surface fragment. SLDPRT (618.0 KB)
Surface fragment 2.SLDPRT (139.1 KB)

I got there, well after I don't know what you want to do with it.
With the fragment I created a thickness.
From the reconstructed form, I created a profile and created a revolution.
I inserted the fragment into my main shape which I then subtracted (the bodies)

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image1011×726 190 KB

1 Like
10

Hello @Léo_SABATIER ,

I propose a geometric construction that can be used even if the surface fragment is not strictly a portion of a torus (imported surface for example).
The goal is to build a torus approaching the fragment, finding the section and the axis...

Step 1
Select [Tools] > [Sketch Tools] > [Face Curves].
Select the surface fragment, and set the desired number of curves.
The curves obtained are splines within 3D sketches...
Some are parallel to each other (in pink), others are convergent and constitute the sections of the future torus (in turquoise).

image
image694×375 131 KB

Step 2
Open the 3D sketch of one of the " Parallel" sketches (the longest...).
Insert a sketch point (point P) at the intersection with one of the " Sections " sketches (the longest...).
To get out of the sketch.

Step 3
Open a new 3D sketch (Sketch3D0) and trace:

  • a first circle C1 passing through points A, P and B,
  • a second circle C2 passing through the points M, P and N
  • a construction line L1 joining the point P to the center of the circle C2.
    Moving beyond the sketch
    image

Step 4
Create a plane through points A, P, and B (Plan1).
Open a 2D sketch in this plane, intended for the generation of the torus, and draw:

  • a coradial circle to circle C1. This is the section of the torus;
  • a construction line perpendicular to the L1 line of the 3D sketch, and passing through the center of C2. This is the axis of the torus.

Step 5
It remains to generate the torus per revolution...
image