Create a sketch and get all intersection curve with all the parts.

CHUNG_MING_CHANG · August 2025

Dear all,

The CAD process I'm doing now is using "intersection curve" to get all the curves, then create a sketch and project them.

("intersection curve" and project with USE, I can use mouse to select a window.)

I want to create a FS, maybe there is another efficiency way to do this. (The input is a selected Plane)

how to create sketch to get all intersection curves
how to use for loop with all part.

If there is a similar FS could be a reference, please also provide and I could study it.

Thanks all

Steven

CHUNG_MING_CHANG · August 2025

Update: Simplify, using body to do intersect.

FeatureScript 2737;
import(path : "onshape/std/common.fs", version : "2737.0");

annotation { "Feature Type Name" : "Section Curves", "Feature Type Description" : "Intersect a plane with all faces" }
export const SectionCurves = defineFeature(function(context is Context, id is Id, definition is map)
precondition
{
// Pick Plane
annotation { "Name" : "Cut Plane", "Filter" : EntityType.FACE && GeometryType.PLANE, "MaxNumberOfPicks" : 1 }
definition.cutPlane is Query;

    // Pick Part, default pick ALL
    annotation { "Name" : "Scope (optional)", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 10 }
    definition.scope is Query;
}
{

    var targetBody =
        (definition.scope != undefined && !isQueryEmpty(context, definition.scope))
        ? qOwnedByBody(definition.scope, EntityType.BODY)   // 指定 Part → 取出所有面
        :qAllModifiableSolidBodiesNoMesh();

    opIntersectFaces(context, id + "intersectFaces1", {
            "tools" : definition.cutPlane,
            "targets" : targetBody
    });


    var PLN1 = evPlane(context, { "face" : definition.cutPlane }); // definition.CutPln is a Query, not a plane
    var sketch1 = newSketchOnPlane(context, id + "sketch1", {
    "sketchPlane" :  PLN1
    }); 

   

    skSolve(sketch1);   
    
    
});

Question:

Sketch generated by FS, can't be used in Assembly. Is this fixed or any way to do it?
How to project all the curves to sketch?

CHUNG_MING_CHANG · August 2025

FeatureScript 2737;
import(path : "onshape/std/common.fs", version : "2737.0");

annotation { "Feature Type Name" : "Section Curves", "Feature Type Description" : "Intersect a plane with all faces" }
export const SectionCurves = defineFeature(function(context is Context, id is Id, definition is map)
precondition
{
// pick plane
annotation { "Name" : "Cut Plane", "Filter" : EntityType.FACE && GeometryType.PLANE, "MaxNumberOfPicks" : 1 }
definition.cutPlane is Query;

    // option, default all parts
    annotation { "Name" : "Scope (optional)", "Filter" : EntityType.BODY, "MaxNumberOfPicks" : 10 }
    definition.scope is Query;
}
{

    var targetFaces =
        (definition.scope != undefined && !isQueryEmpty(context, definition.scope))
        ? qOwnedByBody(definition.scope, EntityType.FACE)   // 指定 Part → 取出所有面
        :qOwnedByBody(qEverything(EntityType.BODY), EntityType.FACE);
        //: qEverything(EntityType.FACE);                      // 全工作室

    // 避免把自己這個平面也放進 targets（平面和自己相交會退化）
    targetFaces = qSubtraction(targetFaces, definition.cutPlane);
    targetFaces = qSubtraction(targetFaces, qCreatedBy(makeId("Right"), EntityType.FACE));
    targetFaces = qSubtraction(targetFaces, qCreatedBy(makeId("Front"), EntityType.FACE));
    targetFaces = qSubtraction(targetFaces, qCreatedBy(makeId("Top"), EntityType.FACE));
    //qCreatedBy(makeId("Right"), EntityType.FACE)



    // 呼叫標準 operation：Plane × Faces → Curves
    opIntersectFaces(context, id + "ic", {
        "tools"   : definition.cutPlane,
        "targets" : targetFaces
    });

    // 交線結果會是新產生的 edges (Curves)，可以用 qCreatedBy 抓出來
    var resultEdges = qCreatedBy(id + "ic", EntityType.EDGE);

    // 也可以在這裡輸出 log 看看
    println("Created curves: " ~ size(evaluateQuery(context, resultEdges)));

    // Define the function's action
    var PLN1 = evPlane(context, { "face" : definition.cutPlane }); // definition.CutPln is a Query, not a plane
    var sketch1 = newSketchOnPlane(context, id + "sketch1", {
    "sketchPlane" :  PLN1
    }); 
   
   


    skSolve(sketch1);   
    
    
});

I debug from GhatGPT, and now it could generate the curves.
Question:

two box →8 curves (if I select 2 parts, correct, but default will generate 10 curves, some duplicate)
1. Curve 1 and Curve 3 are the same
How to create sketch with projection these curves?

Create a sketch and get all intersection curve with all the parts.

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