Edge selector advanced example

[neri-engineering]

Hi, I've been looking for this code for a while, have not found it.

I start with a basic timing belt pulley sort of shape:

I would like to round the sharp edges.  So I add this line:

pulley = pulley.edges("|Z").fillet(radius=fillet_r)

Which produces this:

While this is acceptable in my case I would really rather only round the outside edges and not the ones in the cavity.  I have tried various things, but only superficially, e.g. some sort of "objects closest to a point" selector and the possible use of an inverse selector.  I have not figured out how to chain one of the custom selectors with the '|Z', through use of 'and'.

Basically I want to select all edges that are parallel to Z, which are maximally far away from the origin.  The edges on the outside of teeth happen to be at same distance from origin in my case.

While I can come up with a real cludge of a code to do this, i.e. by referencing hardcoded indices in 'all()', I was wondering if there is some elegant way to do this.

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[Lorenz]

Could you move the fillet to 2D (say with cq.Sketch)? It might be easier that way.

#example based on code from https://groups.google.com/g/cadquery/c/3bfr1eoP7sI/m/l_LdWUJZAAAJ

w = 10
h = 1
r = 2
rc = 0.4

s = (
    cq.Sketch()
    .circle(r)
    .parray(0, 0, 135, 4)
    .rect(w, h, tag="rect")
    .clean()
    .reset()
    .vertices(tag="rect")
    .fillet(rc)
)

[Lorenz]

FYI, new additional special methods are coming with PR 1514.  After this is checked in, the new filter method might be used to select on 3D:

import cadquery as cq

w = 10
h = 1
r = 2
rc = 0.4

dz = 10

s = cq.Sketch().circle(r).parray(0, 0, 135, 4).rect(w, h).clean()

result = cq.Workplane().placeSketch(s).extrude(dz)


def get_outer_edges(pnt, d):
    """Select edges with center distance to point less than d"""

    def callback(obj):
        dist = obj.Center() - cq.Vector(pnt)
        if dist.Length > d:
            return True

    return callback


result = result.edges("|Z").filter(get_outer_edges((0, 0, dz / 2), r + 1))
result = result.fillet(rc)

[Lorenz]

To correct docstring typo, it should say select edges with distance *greater* than d (filtering out the inner edges). 

[Adam Urbanczyk]

Filter was just merged to master. You could also try good old RadiusNthSelector https://cadquery.readthedocs.io/en/latest/apireference.html#selectors

[neri-engineering]

Great.  Thanks.

One of these days I have to get more familiar with PRs and Git.  I sort of only sort of know it.

In particular I need to eventually commit my "animator module", which allows you to programmatically position the camera etc. and take a PNG snapshot of specified dimensions.

Winter projects... winter projects...

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[neri-engineering]

I got the changes from your PR.  In particular Workplane.filter() seems to work nicely.

The code I ended up using was this:

def __z_get_outer_edges(radial_min):

    def callback(obj):

        radial_d = math.sqrt(pow(obj.Center().x, 2) +

                             pow(obj.Center().y, 2))

        if (radial_d >= radial_min):

            return True

    return callback

Now I get nice fillets but only on the outsides of teeth.

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On Wednesday, July 3rd, 2024 at 4:34 PM, Lorenz <lorenzjn...@gmail.com> wrote:

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