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Body2.GetFaces Is very slow with imported bodies

Question asked by James Hall on Feb 17, 2021
Latest reply on Feb 17, 2021 by Josh Brady

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Imported bodies may be arranged in the Part as one Face per facet/polygon.

Parts may then have thousands of faces. When imported bodies have thousands

of faces The Body2.GetFaces() function can take many minutes.

Additionally Body2.GetFirstFace() and Face2.GetNextFace() suffers similarly.

This code can take 10 minutes per body. An unexpected and prohibitive amount of time.

object[] faces = body.GetFaces();

foreach (Face2 f in faces) {

}

I would like to access tessellation data per face.

Can this performance issue be addressed somehow?

Tessellation objects require passing a face in to get the facets, is there a way to get full body tessellation without getting the faces first?

Josh Brady Feb 17, 2021 4:33 PM

Correct Answer

Please see:

SOLIDWORKS Stand-Alone API: do not compromise on performance

I'm pretty over my head on this, but my guess would be that using the separate thread is causing your API calls to be out-of-process. Artem Taturevich may be able to shed a spotlight vs. my dim candle.

See the reply in context

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Diamond Prism - D.SLDPRT.zip2.5 MB

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Josh Brady Feb 17, 2021 11:50 AM

Sorry... Are you asking a question? It sounds like you are talking about bodies imported from STL or something that actually have thousands of faces. I would expect any sort of Get[ThousandsOfThings] function to be pretty slow. I have not experienced this with Parasolid/SAT/IGES/etc files that have a reasonable number of faces. Can you upload an example?

Edit: The question was entirely rewritten after my post above.

In the future, please do not edit your original post. It makes the thread harder to follow. Post additional content in additional posts.

Also, see the help for GetTesselation:

GetTessellation Method (IBody2)

Parameters

FaceList: Array of faces to tessellate; if this is empty, then SOLIDWORKS will tessellate the body

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James Hall @ Josh Brady on Feb 17, 2021 11:01 AM

Sorry josh I hit ctrl-s while typing the question and it posed it. I have updated the post with my questions

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James Hall @ Josh Brady on Feb 17, 2021 11:58 AM

How I see that GetTessellation can tessellate the whole body but it appears i need Face objects to get the facets out.

Is there a way to get facets out of the tessellation object with out passing in the Face objects?

Are the Facet id's predictable in some way?

I tried to access the facets by indexes "for(int i=0; i< FacetCount; i++)" but these were invalid facet IDs ?

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James Hall @ James Hall on Feb 17, 2021 12:02 PM

*Now

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Josh Brady @ James Hall on Feb 17, 2021 12:17 PM

Seems to work pretty quickly for me:

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Josh Brady @ James Hall on Feb 17, 2021 12:26 PM

James Hall wrote:

How I see that GetTessellation can tessellate the whole body but it appears i need Face objects to get the facets out.

Is there a way to get facets out of the tessellation object with out passing in the Face objects?
Are the Facet id's predictable in some way?
I tried to access the facets by indexes "for(int i=0; i< FacetCount; i++)" but these were invalid facet IDs ?

What do you mean by "Get the facets out"? What do you want to do with the facets? Get the coordinates of their vertices? Normals? Edges?

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James Hall Feb 17, 2021 3:22 PM

Your GetFaces call timing is closer to what i would expect. In our c# addin that call for this part takes many minutes.

We are doing this in a separate thread, could this be a problem?

"Get the facets out"? means getting the triangles of the tessellation as vertices.

We are currently using Face2.GetTessTriangles but the GetFaces call is so slow I was looking for work-arounds.

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Josh Brady @ James Hall on Feb 17, 2021 4:33 PM

Please see:

SOLIDWORKS Stand-Alone API: do not compromise on performance

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8 Replies

Josh Brady Feb 17, 2021 11:50 AM
Mark Correct
Correct Answer
Sorry... Are you asking a question? It sounds like you are talking about bodies imported from STL or something that actually have thousands of faces. I would expect any sort of Get[ThousandsOfThings] function to be pretty slow. I have not experienced this with Parasolid/SAT/IGES/etc files that have a reasonable number of faces. Can you upload an example?

Edit: The question was entirely rewritten after my post above.

In the future, please do not edit your original post. It makes the thread harder to follow. Post additional content in additional posts.

Also, see the help for GetTesselation:
GetTessellation Method (IBody2)
Parameters
FaceList
Array of faces to tessellate; if this is empty, then SOLIDWORKS will tessellate the body
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- James Hall @ Josh Brady on Feb 17, 2021 11:01 AM
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  Sorry josh I hit ctrl-s while typing the question and it posed it. I have updated the post with my questions
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- James Hall @ Josh Brady on Feb 17, 2021 11:58 AM
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  Correct Answer
  How I see that GetTessellation can tessellate the whole body but it appears i need Face objects to get the facets out.
  
  Is there a way to get facets out of the tessellation object with out passing in the Face objects?
  Are the Facet id's predictable in some way?
  I tried to access the facets by indexes "for(int i=0; i< FacetCount; i++)" but these were invalid facet IDs ?
  Like • Show 0 Likes0
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  - James Hall @ James Hall on Feb 17, 2021 12:02 PM
    Mark Correct
    Correct Answer
    *Now
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  - Josh Brady @ James Hall on Feb 17, 2021 12:17 PM
    Mark Correct
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    Seems to work pretty quickly for me:
    Like • Show 0 Likes0
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  - Josh Brady @ James Hall on Feb 17, 2021 12:26 PM
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    James Hall wrote:
    
    How I see that GetTessellation can tessellate the whole body but it appears i need Face objects to get the facets out.
    
    Is there a way to get facets out of the tessellation object with out passing in the Face objects?
    Are the Facet id's predictable in some way?
    I tried to access the facets by indexes "for(int i=0; i< FacetCount; i++)" but these were invalid facet IDs ?
    What do you mean by "Get the facets out"? What do you want to do with the facets? Get the coordinates of their vertices? Normals? Edges?
    Like • Show 0 Likes0
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James Hall Feb 17, 2021 3:22 PM
Mark Correct
Correct Answer
Your GetFaces call timing is closer to what i would expect. In our c# addin that call for this part takes many minutes.
We are doing this in a separate thread, could this be a problem?

"Get the facets out"? means getting the triangles of the tessellation as vertices.
We are currently using Face2.GetTessTriangles but the GetFaces call is so slow I was looking for work-arounds.
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- Josh Brady @ James Hall on Feb 17, 2021 4:33 PM
  Unmark Correct
  Correct Answer
  Please see:
  SOLIDWORKS Stand-Alone API: do not compromise on performance
  
  I'm pretty over my head on this, but my guess would be that using the separate thread is causing your API calls to be out-of-process. Artem Taturevich may be able to shed a spotlight vs. my dim candle.
  Like • Show 0 Likes0
  Actions

Body2.GetFaces Is very slow with imported bodies

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