Using Split Body - Error

[middleofthebeach]

Hello,

I had an error that mentions "No intersection between target(s) and split tool." when I apply split body to stp file. Would you tell me why it happens?

Below is the detail situation. 

I am trying to measure a volume of a hole generated on a pipe using 3d scanner because the planned hole and the actual hole sizes are slightly different. The 3d scanned data is converted to stp file and imported in Fusion. 

This is the procedure I was planning to do. This is based on a question: https://forums.autodesk.com/t5/fusion-design-validate-document/measure-the-volume-of-a-hole/m-p/1290.... 

1, Make a pipe body that have same curvature and diameter with the data.

2, Use Split Body for the pipe with the scanned data. 

3, The portion that is cut out is the volume of the hole.

However, the Split Body does not work. Error message "No intersection between target(s) and split tool." occurs. Would you tell me how can I fix this problem?

I have attached the file. Please let me know if you need more information to solve the problem. 

[johnsonshiue]

Hi! The toolbody looks like a body converted from a mesh model with excessive number of edges. The mesh model is an approximated representation of a precise model. When you try to operate an approximated geometry on a precise body (Fusion), it will be problematic.

I personally think you might be better of recreating the toolbody using Fusion features based on the measurement. Then try to split the body. Another approach to consider is to convert the mesh body to smooth geometry (available in Fusion Extension).

Many thanks!

[middleofthebeach]

Hi Johnson,

Thank you so much for letting me know. Could you please provide more details about the Fusion Extension? Also, which version supports this function?

[TrippyLighting]

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@johnsonshiue wrote:

... Another approach to consider is to convert the mesh body to smooth geometry (available in Fusion Extension)...

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Clearly, that has already been done with the organic mesh conversion, and an extension is unnecessary.

One significant drawback in Fusion of converting a triangulated mesh (.stl, for instance) into a CAD (NURBS) surface or BRep is the unavailability of the intermediate quad-mesh.

@middleofthebeach I would recommend starting from scratch and enable the timeline. That makes subsequent edits much easier and allows us to provide better help.

[TrippyLighting]

I am not entirely sure this is what you are looing for, but here's a screencast:

[johnsonshiue]

Hi! I could be wrong but I thought "Organic" mesh conversion required "Design Extension" subscription.

Many thanks!

[TrippyLighting]

@johnsonshiue You might be correct. As an Autodesk Expert Elite and early adopter, I am not always clear what "normal" users have access to.

However, in this case, the conversion form mesh is already completed 😉  

[middleofthebeach]

Hello,

Thank you so much for sharing. It exactly what I wanna do.

Additionally, I would like to project the inner surface of the split body to the wall of the cylinder like the figure. is it possible? 

[CGBenner]

@TrippyLighting 

Hello!  Do you have any more ideas for this user on the latest post?

[TrippyLighting]

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@middleofthebeach wrote:

Hello,

Thank you so much for sharing. It exactly what I wanna do.

Additionally, I would like to project the inner surface of the split body to the wall of the cylinder like the figure. is it possible? 

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Do you still need help with this?

After "projecting" the outline onto the cylinder, what do you wan to do with the projection?

[middleofthebeach]

@TrippyLighting and @CGBenner Thank you so much. I still need helps. 

[TrippyLighting]

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@middleofthebeach wrote:

@TrippyLighting and @CGBenner Thank you so much. I still need helps. 

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Cool! Please answer my 2nd question:

After "projecting" the outline onto the cylinder, what do you wan to do with the projection?

[middleofthebeach]

@TrippyLightingI want to make a cylinder and measure the volume like the figure below. 

Since the laser is emitted from outside the pipe, the deeper side of the wall is not measured accurately. So I divided the hole volume into two regions: accurate region and extrapolate region. 

cross section of the pipe

To measure the extrapolated area, I use surface offset => Loft => split body with inner wall. However, the offset surface is somehow vertical ellipse (I guess this is because of pipe). I want to project it with the same shape or shrink them with same ratio. 

[TrippyLighting]

And what would you do with that measured value for the volume?

[middleofthebeach]

I have several hole data. I will compare the volumes. 

[TrippyLighting]

How are these holes created?
What is the purpose of these holes?

What are you trying to gain from comparing the different hole volumes?

Scanning a physical artifact already is an approximation.
Then converting the scanned mesh into a Quad mesh->T-Spline->BRep is an approximation.

Continued modeling is an approximation.

[middleofthebeach]

If I flow water and sand through the pipe, the hole enlarges. I want to evaluate how much the hole enlarges due to the flow. 

[CGBenner]

@middleofthebeach Hello, do you still need help with this question?