how to query for all vertexes in a mesh

tommie_berry · April 2019

kevin_o_toole_1 · April 2019

Unfortunately I don't think there is a method of doing that in FeatureScript. If you'd like, you can submit an improvement request for this functionality.

lana · April 2019

@tommie_berry
If you can get point coordinates as csv file this feature can be used to build a spline

philip_thomas · April 2019

There is an updated XYZ custom feature that takes advantage of 'Reference Parameters' (the ability to point a custom feature to different data sources)

https://cad.onshape.com/documents/a5566bc4a7c123d4958fd925/w/de9e3b016a0232b5b8ec183d/e/97994fc552ad661c4611715d

Image: https://us.v-cdn.net/5022071/uploads/editor/as/ha8g4om7wslu.png

tommie_berry · April 2019

Yes, it is easy to extract all vertex points from the .stl file. Sorting them into each plane of the original scan is very difficult. The original scan planes are all parallel. I used the 3D points program in featurescript to create 3D splines, but you can only loft between 2D splines. So you have to create 2D closed splines from all the points close (<0.1mm) to one scan plane.
then go to the next plane. So I agree, I can use the extracted points from a csv. But it would have been so much easier to query for all the points.

billy2 · April 2019

@tommie_berry

Sorry for the late post, haven't had the time to dig up an old project I've worked on. I was working on point clouds and selecting planar points from cloud. I also had points close to faces. I also have an opinion about all this.

Cloud of points read from obj file:

Image: https://us.v-cdn.net/5022071/uploads/editor/5z/gq73fbvwl0n5.png

points close to a plane:

You iterate through cloud and evaluate distance from plane to point. I think these are 1mm close to this plane. If you wanted all points on the plane, then you would have 0 points, mathematically no points are on the plane. You could project points onto the plane and then try and create a spline. Please keep in mind that these are an unsorted list and to create a spline you're going sort points from top to bottom. Then you'll end up with a crappy looking curve.

Then I asked for points closest to some faces:

Image: https://us.v-cdn.net/5022071/uploads/editor/8q/xmh33j6tpgax.png

I don't know what you'd do with these?

I have the code and would be happy to share it with you if you want it. The command you're looking for is eval distance.

My opinion:
I don't think it's practical to expect some algorithm to look at all the chaos in a cloud of points and come up with some geometry that'll be worth any thing. I'm no mathematician, and possibly you are, but I found this to be a dead end road.

What's working for me, is to bring in a mesh and use it as a visual guide:

Image: https://us.v-cdn.net/5022071/uploads/editor/0o/5l81fsgn4nsa.png

It's so easy for a human to fit a spline through some chaotic point cloud and get a great shape.

Once again this my opinion, but I think an art student from your local community collage can out perform a $1,000,000 computer algorithm trying to do the same thing.

tommie_berry · April 2019

Thank you, that was very helpful.
if you could send that code to tom@berry.org I am very interested.

billy2 · April 2019

FeatureScript 370;
import(path : "onshape/std/geometry.fs", version : "370.0");

import(path : "c7c1d6986e28b170c61450e7", version : "e5c1f8fac7228a89a9e1153b");


function parseVertex(s is string) // Returns a unitless 3D Vector or undefined
{
    const regexp = "v\\s+" ~ REGEX_NUMBER_CAPTURE ~
        "\\s+" ~ REGEX_NUMBER_CAPTURE ~
        "\\s+" ~ REGEX_NUMBER_CAPTURE ~ "\\s*";
    const matches = match(s, regexp);
    if (!matches.hasMatch)
        return undefined;
    var result = makeArray(3);
    for (var i in [0, 1, 2])
        result[i] = stringToNumber(matches.captures[i + 1]);
    return vector(result);
}

export const MY_COUNT_BOUNDS =
{
            "min" : 0,
            "max" : 1e9,
            (unitless) : [0, 50, 1e5]
        } as IntegerBoundSpec;


annotation { "Feature Type Name" : "objData", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objData = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Reduction" }
        isInteger(definition.skip, MY_COUNT_BOUNDS);

    }
    {
        const data = BLOB_DATA.csvData;

        var str;
        var v;
        var vectors = [];
        var arrayCnt = 0;
        var totalCnt = 0;
        var cnt = 1;



        //compute total number of points and center
        for (var row in data)
        {
            //println('row[0] ' ~ row[0]);
            str = splitIntoCharacters(toString(row[0]));

            if (size(str) > 0 && str[0] == 'v' && str[1] == ' ')
            {
                if (cnt > definition.skip)
                {
                    //println(' row[0] ' ~ row[0]);
                    v = parseVertex(row[0]);
                    vectors = append(vectors, v);
                    arrayCnt += 1;
                    cnt = 0;
                }
                totalCnt += 1;
                cnt += 1;
            }
        }

        //println('data vectors ' ~ vectors);
        println('total data ' ~ totalCnt);
        println('array data ' ~ arrayCnt);

        setVariable(context, 'billysVectors', vectors);
        setVariable(context, 'billysArrayCnt', arrayCnt);

    });


annotation { "Feature Type Name" : "objCenter", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objCenter = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        // Define the parameters of the feature type
    }
    {
        var xmax = 0;
        var xmin = 0;
        var ymax = 0;
        var ymin = 0;
        var zmax = 0;
        var zmin = 0;
        var vectorCnt = 0;

        var arrayCnt = getVariable(context, 'billysArrayCnt');
        var vectors = getVariable(context, 'billysVectors');

        //println('center vectors ' ~ vectors);

        //compute offset vector
        for (var v in vectors)
        {

            if (vectorCnt == 0)
            {
                xmax = v[0];
                xmin = v[0];
                ymax = v[1];
                ymin = v[1];
                zmax = v[2];
                zmin = v[2];

            }
            else
            {

                if (v[0] > xmax)
                    xmax = v[0];
                if (v[0] < xmin)
                    xmin = v[0];
                if (v[1] > ymax)
                    ymax = v[1];
                if (v[1] < ymin)
                    ymin = v[1];
                if (v[2] > zmax)
                    zmax = v[2];
                if (v[2] < zmin)
                    zmin = v[2];
            }

            vectorCnt += 1;
        }


        //println('xmax ' ~ xmax ~ ' xmin ' ~ xmin ~ ' ymax ' ~ ymax ~ ' ymin ' ~ ymin ~ ' zmax ' ~ zmax ~ ' zmax ' ~ zmax);
        var offsetV = vector([xmin + (xmax - xmin) / 2, ymin + (ymax - ymin) / 2, zmin + (zmax - zmin) / 2]);
        //println('offsetV ' ~ offsetV);

        //println('evDistance ' ~  evDistance (context, vectors));


        for (var cnt = 0; cnt < arrayCnt; cnt += 1)
        {
            vectors[cnt] = vectors[cnt] - offsetV;
        }


        setVariable(context, 'billysVectors', vectors);

        println('center ' ~ arrayCnt);
    }, { /* default parameters */ });




export const MY_COUNT_BOUNDS2 =
{
            "min" : 1,
            "max" : 1e9,
            (unitless) : [1, 500, 1e5]
        } as IntegerBoundSpec;

annotation { "Feature Type Name" : "objDisplay", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objDisplay = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        // Define the parameters of the feature type
        annotation { "Name" : "Cloud Points" }
        isInteger(definition.count, MY_COUNT_BOUNDS2);
    }
    {
        var arrayCnt = getVariable(context, 'billysArrayCnt');
        var vectors = getVariable(context, 'billysVectors');
        //println('totalCnt ' ~ totalCnt);

        var skipNum = arrayCnt / definition.count;
        var skipCnt = 0;
        var pointCnt = 0;

        //display points
        for (var v in vectors)
        {
            //print(skipCnt ~ ' ');
            if (skipCnt > skipNum)
            {
                //println(pointCnt ~ ' ' ~ v);
                opPoint(context, id + pointCnt + "point", { "point" : v * meter, "origin" : true });
                pointCnt += 1;
                skipCnt = 0;
            }
            skipCnt += 1;
        }

        println('display ' ~ pointCnt);
    }, { /* default parameters */ });





export const MY_LENGTH_BOUNDS =
{
            "min" : -TOLERANCE.zeroLength * meter,
            "max" : 500 * meter,
            (meter) : [1e-5, 0.010, 500],
            (centimeter) : .05,
            (millimeter) : .5,
            (inch) : .01,
            (foot) : 0.001,
            (yard) : 0.0001
        } as LengthBoundSpec;

annotation { "Feature Type Name" : "objSlice", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objSlice = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Pick Face", "Filter" : EntityType.FACE }
        definition.faces is Query;

        annotation { "Name" : "Tolerance Gap" }
        isLength(definition.gap, MY_LENGTH_BOUNDS);

    }
    {
        var dist = 0;
        var pointCnt = 0;
        var vectors = getVariable(context, 'billysVectors');
        const faces = evaluateQuery(context, definition.faces);

        for (var v in vectors)
        {
            for (var face in faces)
            {
                dist = evDistance(context, { "side0" : v * meter, "side1" : face }).distance;
                //println('dist ' ~ dist.value);

                if (abs(dist.value) * meter < definition.gap)
                {
                    //println(pointCnt ~ ' ' ~ v);
                    //println('dist ' ~ dist.value);
                    opPoint(context, id + pointCnt + "point", { "point" : v * meter, "origin" : true });
                    pointCnt += 1;
                }
            }
        }
        println('slice ' ~ pointCnt);

    }, { /* default parameters */ });



annotation { "Feature Type Name" : "objRemove", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objRemove = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Pick Bodies", "Filter" : EntityType.BODY }
        definition.bodies is Query;

        //annotation { "Name" : "Tolerance Gap" }
        //isLength(definition.gap, MY_LENGTH_BOUNDS);

        annotation { "Name" : "keep points in body", "Default" : true }
        definition.keepPoints is boolean;


    }
    {
        var result = [];
        var pointCnt = 0;
        //var removeCnt = 0;
        var vectors = getVariable(context, 'billysVectors');
        const bodies = evaluateQuery(context, definition.bodies);

        for (var v in vectors)
        {
            for (var body in bodies)
            {
                /*
                   result = evCollision(context, {
                   "tools" : v * meter,
                   "targets" : body
                   });
                 */


                if (definition.keepPoints)
                {
                    //outside body
                    if (evaluateQuery(context, qContainsPoint(body, v * meter)) != [])
                    {
                        pointCnt += 1;
                        //println('false ');
                        result = append(result, v);
                    }
                }
                else
                {
                    //inside body
                    if (evaluateQuery(context, qContainsPoint(body, v * meter)) == [])
                    {
                        pointCnt += 1;
                        //println('true ');
                        result = append(result, v);
                    }
                }



            }
        }
        println('remove ' ~ pointCnt);
        //println('result' ~ result);

        setVariable(context, 'billysArrayCnt', pointCnt);
        setVariable(context, 'billysVectors', result);

    }, { /* default parameters */ });

oh yeah! remember to create block 1st & then paste into it. Thanks Jake.

tommie_berry · April 2019

I have a part studio with just an imported mesh.
I want to loop through all the vertexes in the mesh using featurescript.

philip_thomas · April 2019

Perhaps positing in the FeatureScript forum?

tommie_berry · April 2019

That’s where I thought it was, I wish I could delete it.

philip_thomas · April 2019

@TimRice - can you help Tommie get this down and moved to the FeatureScript forum - there he will get a snippet that does exactly what he needs.

tommie_berry · April 2019

I reposted over there, please delete this one, sorry😜

kevin_o_toole_1 · April 2019

Hi Tommie,

There is no direct way to iterate through every single point in a mesh in FeatureScript. A user may select individual mesh points into a query parameter, but not all at once. If you are looking to do mathematical calculations on every single point, FeatureScript may simply not be the right solution for you.

We do support many ways of identifying specific positions on a mesh surface. For instance you can find the closest point to another point/plane/body with evDistance, or find a point along a ray with evRaycast.

So, what's your use case?

Jake_Rosenfeld · April 2019

@tommie_berry

We don't expose mesh vertices to FeatureScript. If you do a qOwnedByBody on a mesh, you'll notice that a mesh is basically just one composite face:

Image: https://us.v-cdn.net/5022071/uploads/editor/ro/xmtkiifezody.png

https://cad.onshape.com/documents/f8b3df73f921b5ed6b03e0a3/w/180340618b58cdd57349a22f/e/899f59ff6132240c25fb70df

This simplification allows us to increase user performance when working with meshes. Please submit an Improvement Request for us to expose this information, or to create some kind of workaround function to expose a list of the locations of the vertices.

What is your desired feature here? Maybe we can suggest a different approach.

tommie_berry · April 2019

If I could get the list of mesh points, then I could read a 2D spline for each original plane from the scan. Then I can loft between those 2D splines, to create an object I can edit.

kevin_o_toole_1 · April 2019

Unfortunately I don't think there is a method of doing that in FeatureScript. If you'd like, you can submit an improvement request for this functionality.

lana · April 2019

@tommie_berry
If you can get point coordinates as csv file this feature can be used to build a spline

philip_thomas · April 2019

There is an updated XYZ custom feature that takes advantage of 'Reference Parameters' (the ability to point a custom feature to different data sources)

https://cad.onshape.com/documents/a5566bc4a7c123d4958fd925/w/de9e3b016a0232b5b8ec183d/e/97994fc552ad661c4611715d

tommie_berry · April 2019

Yes, it is easy to extract all vertex points from the .stl file. Sorting them into each plane of the original scan is very difficult. The original scan planes are all parallel. I used the 3D points program in featurescript to create 3D splines, but you can only loft between 2D splines. So you have to create 2D closed splines from all the points close (<0.1mm) to one scan plane.
then go to the next plane. So I agree, I can use the extracted points from a csv. But it would have been so much easier to query for all the points.

billy2 · April 2019

@tommie_berry

Sorry for the late post, haven't had the time to dig up an old project I've worked on. I was working on point clouds and selecting planar points from cloud. I also had points close to faces. I also have an opinion about all this.

Cloud of points read from obj file:

points close to a plane:

You iterate through cloud and evaluate distance from plane to point. I think these are 1mm close to this plane. If you wanted all points on the plane, then you would have 0 points, mathematically no points are on the plane. You could project points onto the plane and then try and create a spline. Please keep in mind that these are an unsorted list and to create a spline you're going sort points from top to bottom. Then you'll end up with a crappy looking curve.

Then I asked for points closest to some faces:

I don't know what you'd do with these?

I have the code and would be happy to share it with you if you want it. The command you're looking for is eval distance.

My opinion:
I don't think it's practical to expect some algorithm to look at all the chaos in a cloud of points and come up with some geometry that'll be worth any thing. I'm no mathematician, and possibly you are, but I found this to be a dead end road.

What's working for me, is to bring in a mesh and use it as a visual guide:

It's so easy for a human to fit a spline through some chaotic point cloud and get a great shape.

Once again this my opinion, but I think an art student from your local community collage can out perform a $1,000,000 computer algorithm trying to do the same thing.

tommie_berry · April 2019

Thank you, that was very helpful.
if you could send that code to tom@berry.org I am very interested.

billy2 · April 2019

FeatureScript 370;
import(path : "onshape/std/geometry.fs", version : "370.0");

import(path : "c7c1d6986e28b170c61450e7", version : "e5c1f8fac7228a89a9e1153b");


function parseVertex(s is string) // Returns a unitless 3D Vector or undefined
{
    const regexp = "v\\s+" ~ REGEX_NUMBER_CAPTURE ~
        "\\s+" ~ REGEX_NUMBER_CAPTURE ~
        "\\s+" ~ REGEX_NUMBER_CAPTURE ~ "\\s*";
    const matches = match(s, regexp);
    if (!matches.hasMatch)
        return undefined;
    var result = makeArray(3);
    for (var i in [0, 1, 2])
        result[i] = stringToNumber(matches.captures[i + 1]);
    return vector(result);
}

export const MY_COUNT_BOUNDS =
{
            "min" : 0,
            "max" : 1e9,
            (unitless) : [0, 50, 1e5]
        } as IntegerBoundSpec;


annotation { "Feature Type Name" : "objData", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objData = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Reduction" }
        isInteger(definition.skip, MY_COUNT_BOUNDS);

    }
    {
        const data = BLOB_DATA.csvData;

        var str;
        var v;
        var vectors = [];
        var arrayCnt = 0;
        var totalCnt = 0;
        var cnt = 1;



        //compute total number of points and center
        for (var row in data)
        {
            //println('row[0] ' ~ row[0]);
            str = splitIntoCharacters(toString(row[0]));

            if (size(str) > 0 && str[0] == 'v' && str[1] == ' ')
            {
                if (cnt > definition.skip)
                {
                    //println(' row[0] ' ~ row[0]);
                    v = parseVertex(row[0]);
                    vectors = append(vectors, v);
                    arrayCnt += 1;
                    cnt = 0;
                }
                totalCnt += 1;
                cnt += 1;
            }
        }

        //println('data vectors ' ~ vectors);
        println('total data ' ~ totalCnt);
        println('array data ' ~ arrayCnt);

        setVariable(context, 'billysVectors', vectors);
        setVariable(context, 'billysArrayCnt', arrayCnt);

    });


annotation { "Feature Type Name" : "objCenter", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objCenter = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        // Define the parameters of the feature type
    }
    {
        var xmax = 0;
        var xmin = 0;
        var ymax = 0;
        var ymin = 0;
        var zmax = 0;
        var zmin = 0;
        var vectorCnt = 0;

        var arrayCnt = getVariable(context, 'billysArrayCnt');
        var vectors = getVariable(context, 'billysVectors');

        //println('center vectors ' ~ vectors);

        //compute offset vector
        for (var v in vectors)
        {

            if (vectorCnt == 0)
            {
                xmax = v[0];
                xmin = v[0];
                ymax = v[1];
                ymin = v[1];
                zmax = v[2];
                zmin = v[2];

            }
            else
            {

                if (v[0] > xmax)
                    xmax = v[0];
                if (v[0] < xmin)
                    xmin = v[0];
                if (v[1] > ymax)
                    ymax = v[1];
                if (v[1] < ymin)
                    ymin = v[1];
                if (v[2] > zmax)
                    zmax = v[2];
                if (v[2] < zmin)
                    zmin = v[2];
            }

            vectorCnt += 1;
        }


        //println('xmax ' ~ xmax ~ ' xmin ' ~ xmin ~ ' ymax ' ~ ymax ~ ' ymin ' ~ ymin ~ ' zmax ' ~ zmax ~ ' zmax ' ~ zmax);
        var offsetV = vector([xmin + (xmax - xmin) / 2, ymin + (ymax - ymin) / 2, zmin + (zmax - zmin) / 2]);
        //println('offsetV ' ~ offsetV);

        //println('evDistance ' ~  evDistance (context, vectors));


        for (var cnt = 0; cnt < arrayCnt; cnt += 1)
        {
            vectors[cnt] = vectors[cnt] - offsetV;
        }


        setVariable(context, 'billysVectors', vectors);

        println('center ' ~ arrayCnt);
    }, { /* default parameters */ });




export const MY_COUNT_BOUNDS2 =
{
            "min" : 1,
            "max" : 1e9,
            (unitless) : [1, 500, 1e5]
        } as IntegerBoundSpec;

annotation { "Feature Type Name" : "objDisplay", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objDisplay = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        // Define the parameters of the feature type
        annotation { "Name" : "Cloud Points" }
        isInteger(definition.count, MY_COUNT_BOUNDS2);
    }
    {
        var arrayCnt = getVariable(context, 'billysArrayCnt');
        var vectors = getVariable(context, 'billysVectors');
        //println('totalCnt ' ~ totalCnt);

        var skipNum = arrayCnt / definition.count;
        var skipCnt = 0;
        var pointCnt = 0;

        //display points
        for (var v in vectors)
        {
            //print(skipCnt ~ ' ');
            if (skipCnt > skipNum)
            {
                //println(pointCnt ~ ' ' ~ v);
                opPoint(context, id + pointCnt + "point", { "point" : v * meter, "origin" : true });
                pointCnt += 1;
                skipCnt = 0;
            }
            skipCnt += 1;
        }

        println('display ' ~ pointCnt);
    }, { /* default parameters */ });





export const MY_LENGTH_BOUNDS =
{
            "min" : -TOLERANCE.zeroLength * meter,
            "max" : 500 * meter,
            (meter) : [1e-5, 0.010, 500],
            (centimeter) : .05,
            (millimeter) : .5,
            (inch) : .01,
            (foot) : 0.001,
            (yard) : 0.0001
        } as LengthBoundSpec;

annotation { "Feature Type Name" : "objSlice", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objSlice = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Pick Face", "Filter" : EntityType.FACE }
        definition.faces is Query;

        annotation { "Name" : "Tolerance Gap" }
        isLength(definition.gap, MY_LENGTH_BOUNDS);

    }
    {
        var dist = 0;
        var pointCnt = 0;
        var vectors = getVariable(context, 'billysVectors');
        const faces = evaluateQuery(context, definition.faces);

        for (var v in vectors)
        {
            for (var face in faces)
            {
                dist = evDistance(context, { "side0" : v * meter, "side1" : face }).distance;
                //println('dist ' ~ dist.value);

                if (abs(dist.value) * meter < definition.gap)
                {
                    //println(pointCnt ~ ' ' ~ v);
                    //println('dist ' ~ dist.value);
                    opPoint(context, id + pointCnt + "point", { "point" : v * meter, "origin" : true });
                    pointCnt += 1;
                }
            }
        }
        println('slice ' ~ pointCnt);

    }, { /* default parameters */ });



annotation { "Feature Type Name" : "objRemove", "UIHint" : "NO_PREVIEW_PROVIDED" }
export const objRemove = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Pick Bodies", "Filter" : EntityType.BODY }
        definition.bodies is Query;

        //annotation { "Name" : "Tolerance Gap" }
        //isLength(definition.gap, MY_LENGTH_BOUNDS);

        annotation { "Name" : "keep points in body", "Default" : true }
        definition.keepPoints is boolean;


    }
    {
        var result = [];
        var pointCnt = 0;
        //var removeCnt = 0;
        var vectors = getVariable(context, 'billysVectors');
        const bodies = evaluateQuery(context, definition.bodies);

        for (var v in vectors)
        {
            for (var body in bodies)
            {
                /*
                   result = evCollision(context, {
                   "tools" : v * meter,
                   "targets" : body
                   });
                 */


                if (definition.keepPoints)
                {
                    //outside body
                    if (evaluateQuery(context, qContainsPoint(body, v * meter)) != [])
                    {
                        pointCnt += 1;
                        //println('false ');
                        result = append(result, v);
                    }
                }
                else
                {
                    //inside body
                    if (evaluateQuery(context, qContainsPoint(body, v * meter)) == [])
                    {
                        pointCnt += 1;
                        //println('true ');
                        result = append(result, v);
                    }
                }



            }
        }
        println('remove ' ~ pointCnt);
        //println('result' ~ result);

        setVariable(context, 'billysArrayCnt', pointCnt);
        setVariable(context, 'billysVectors', result);

    }, { /* default parameters */ });

oh yeah! remember to create block 1st & then paste into it. Thanks Jake.

Jake_Rosenfeld · April 2019

@billy2

The code block should be fine as long as you create the code block first and then paste into it. If you paste and then highlight and click code, it looks bad.

GregBrown · March 19

Just for correctness/completeness, now (March 2025) we have evMeshPoints that will help a lot of the things you've been wanting to do.

how to query for all vertexes in a mesh

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