Is there an API endpoint for checking interference between two parts?

md_al_mamun316

I am using onshape through API request and I have a question regarding Interence check functionality. 

For UI, we have interence check option in both Assembly studio and Part studio, but I cannot find the enpoint that does the same functionality. 

Can someone help me to locate the endpoint that checks the interence of two parts? 

Thanks in advance.

MichaelPascoe

I'm not sure this is possible. @caden_armstrong will know.

The only way I know of currently is to use a custom feature like this: 
https://forum.onshape.com/discussion/comment/45646/#Comment_45646

caden_armstrong2

Michael is correct, there is no API end point for the interference check.
You can do it with a featurescript and call the featurescript via the API, but this only works inside of a part studio.

md_al_mamun316

@caden_armstrong

Thanks for the answer. I still have follow-up questions.

• I have to use featurescript POST endpoint. Right? 

• If I look at the request body, it is not clear to me. Can you explain me how I should send the request?  Should I fill the part_ids in "additionalProp1" field as a list? Below I included the request body. 
• If I look at the response as well, I also don't know which parameter is indicating interference. Can you point-out parameter indicating interfence in the response? 

Thanks a lot.

}
{
  "libraryVersion": 0,
  "microversionSkew": true,
  "queries": {
    "additionalProp1": [
      "string"
    ],
    "additionalProp2": [
      "string"
    ],
    "additionalProp3": [
      "string"
    ]
  },
  "rejectMicroversionSkew": true,
  "script": "string",
  "serializationVersion": "string",
  "sourceMicroversion": "string"

md_al_mamun316

@caden_armstrong @MichaelPascoe

I am new to onshape and still learning a lot. I think you can ingnore my previous question as I have undestood Feature Script and Feature Studio. First I need to create a featurescript that checks the interference of given two parts then make API call to the featurescript. That is clear.

However, I still have one problem.

I have tried to create my featurescript for interference check but I am stuck after I got the part Ids as a precondition. There is interference function but I don't know how to use it. I hope you can help me on this one. Thanks in advance.

You can see my featurescript below: 

FeatureScript 1913;
import(path : "onshape/std/geometry.fs", version : "1913.0");

annotation { "Feature Type Name" : "Interference" }
export const interference = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "part1_id", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 1 }
        definition.part1_id is Query;
        annotation { "Name" : "part2_id", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 1 }
        definition.part2_id is Query;
    }
    {
        interference(context, id, definition);
    });

MichaelPascoe

I'm not sure interference() is an op that is available. In your code you are trying to call your own feature into it's own definition. This course should get you started with FeatureScript: Learning Center - FeatureScript

Try evCollision() instead of interference().

evCollision(context, {
                "tools" : tools,
                "targets" : targets
        });

md_al_mamun316

Thanks for your reply. 

My custom Collision feature works on UI. Here is the script:

annotation { "Feature Type Name" : "Collision" }
export const collisionFeature = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        // Define the parameters of the feature type
        annotation { "Name" : "part1", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 1 }
        definition.part1 is Query;

        annotation { "Name" : "part2", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 1 }
        definition.part2 is Query;
    }
    {
        // Define the function's action
        var arrs = evCollision(context, {
                "tools" : definition.part1,
                "targets" : definition.part2
            });
        var count = 0;
        for (var ar in arrs)
        {
            if (ar['type'] == ClashType.INTERFERE)
            {
                count = count + 1;
            }
        }
        return count;
    });

It works as I have checked it with script notices. 

Now, my real question was to do it through API calls. I am testing it on API explorer (https://cad.onshape.com/glassworks/explorer#/ ). Here is request body that I am sending for featurescript POST endpoint:

{
  "queries": {"part1": ["JFD"], "part2": ["JFL"]},
  "script": "function (context is Context, definition is map) { var arrs = evCollision(context,{tools: definition.part1, targets: definition.part2}); var count = 0; for(var ar in arrs){if(ar['type'] == ClashType.INTERFERE){count = count + 1;}}return count;}"
}

This also works as I get the following response:

{
  "btType": "BTFeatureScriptEvalResponse-1859",
  "result": {
    "btType": "com.belmonttech.serialize.fsvalue.BTFSValueNumber",
    "value": 14,
    "typeTag": ""
  },
  "console": "",
  "notices": [],
  "libraryVersion": 1930,
  "serializationVersion": "1.1.23",
  "rejectMicroversionSkew": false,
  "microversionSkew": false,
  "sourceMicroversion": ""
}

However, when I do it using onshape_client package on Python it doesn't work. Here is my code:

body = {
    "queries": {"part1": ["JFD"], "part2": ["JFL"]},
    "script": "function (context is Context, definition is map) { var arrs = evCollision(context,{tools: definition.part1, targets: definition.part2}); var count = 0; for(var ar in arrs){if(ar['type'] == ClashType.INTERFERE){count = count + 1;}}return count;}"
    }

response = client.part_studios_api.eval_feature_script(did=document.id,
                                                            wvm=document.w_or_v,
                                                            wvmid=document.workspace_id,
                                                            eid=document.element_id,
                                                            bt_feature_script_eval_call_2377=body,
                                                            _preload_content=False)

I got the following error:

{\n  "message" : "Error processing json",\n  "moreInfoUrl" : "",\n  "status" : 400,\n  "code" : 0\n}

Can you help me on this? @caden_armstrong @MichaelPascoe

MichaelPascoe

I'm not sure on this one.

md_al_mamun316

@MichaelPascoe can you suggest someone who can help?  

MichaelPascoe

Caden is the best API guy I know. I stick to FeatureScript. If you are setting this up for your company, then I suggest having CADSharp do it. If this is for research or a personal project, try the resource below.

Here is a neat API resource I noticed the other day: https://forum.onshape.com/discussion/19547/app-to-help-with-app-development#latest
Sounds like it will be perfect for what you are trying to do. Contact @Aaron_Magnin to get in on the beta.

Aaron_Magnin

Thanks for plugging that, @MichaelPascoe! I think it'll be released very soon...once it does, I'll try to update this conversation. 

md_al_mamun316

@MichaelPascoe

Thanks for the information.