Full Version: Lots of unkown

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any tips how to use shrink trimmed surface, or where it can be used ?

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Hi Tudor, if you start with a complex surface and then boolean or trim away a large portion of it:






the original full surface is still there as the "underlying surface":




If you apply ShrinkTrimmedSrf to this, it will shrink down the underlying surface and cut out areas outside of the trim curve boundaries:



This can reduce surface complexity in cases like this and sometimes there can be problematic things like self intersections in other areas of the underlying surface that could interfere with some kinds of calculations.

Usually it is good to keep the full original surfaces because it makes repair operations by untrimming easier but if it's a very complex surface it can carry a lot of data size.

- Michael

Image Attachments:
shrinktrimmedsrf_example1.jpg  shrinktrimmedsrf_example2.jpg  shrinktrimmedsrf_example3.jpg  shrinktrimmedsrf_example4.jpg 

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problems with export as fbx/obj
fillets are not native

Attachments:
ring2.3dm

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Hi Tudor, it looks like maybe the object is inside-out. Try selecting it, then run Edit > Separate followed by Edit > Join. That seems to get its orientation set up ok.

Also your object is at a very small scale of only 0.02 units across. Try scaling it up by 100 times before meshing it, that will avoid some points from getting merged together.

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constant fillet fails on curves and not on surfaces, weird

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Hi Tudor,

re:
> constant fillet fails on curves and not on surfaces, weird

Prior to v4, constant radius fillet was not available for curves at all, as of v4 it works on line segments:

https://moi3d.com/wiki/V4Beta#Feb-27-2019


- Michael

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could be implemented in next version ?

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Hi Tudor,

re:
> could be implemented in next version ?

Sorry, no probably not, it's not supported by the geometry library currently.

- Michael

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can't find script for "select similar edge length"

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Hi Tudor,

re:
> can't find script for "select similar edge length"

Is it one in this thread? :
http://moi3d.com/forum/lmessages.php?webtag=MOI&msg=8905.1

- Michael

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not quite that i'm searching for
there's a filter for curves biggest, smallest, or min/max , but I'm searching for edges
example - extrude taped, select one side edge of taped - run the script -> fillet/chamfer
or draw a rectangle, extrude by x amount, select 1 edge of height - run the script, or select the edge of original rectangle run the script

i've forgot lots of moi's scripting
select desired edge
moi.geometryDatabase.getSelectedObjects().getEdges().item(0).getLength(); get's edge selection length
get parent object(want only for current selection, in case there are duplicates of same object), get edges, loop through edges, if there's similar length - select

or if i Have a selected edge how can i get object numEdges count for the loop
by my understanding it should be ~ moi.geometryDatabase.getSelectedObjects().getTopLevelObjects().item(0).getEdges().numEdges
moi.geometryDatabase.getSelectedObjects() -> selected
.getTopLevelObjects() -> object itself
.item(0) - object nr
.getEdges() - all the edges
.numEdges - count edges
that doesn't work

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Hi Tudor, the problem in your script there is this part:

> .getTopLevelObjects() -> object itself

All the " getXXXXX()" methods on an object list do are filtering mechanisms, they make a new list that only contains the given types that are already present in the current list.

So if you had an object list with 2 objects in it, an edge and a brep, when you call getTopLevelObjects() it would return a list with just the brep in it, that's the only top level object currently in the list.

If you have an object list with just one edge in it, calling getTopLevelObjects() on it will return an empty list because there are no top level objects directly in the list currently.

You need to instead do something like this:

var objs = moi.geometryDatabase.getSelectedObjects(); if ( objs.numEdges == 1 ) { var edge = objs.item(0); var edges = edge.getParentBRep().getEdges(); moi.ui.alert( edges.length); }

So get the edge object, call getParentBRep() on it to get the parent brep, then call getEdges() on that.

- Michael

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thanks !

/* select similar length edge*/
var edgeSelected = moi.geometryDatabase.getSelectedObjects().getEdges().item(0).getLength();
var objs = moi.geometryDatabase.getSelectedObjects();
var tollerance = 1000;
if ( objs.numEdges == 1 ) {
var edge = objs.item(0);
var edgeL = objs.item(0).getLength();
var min = edgeL - edgeL/tollerance;
var max = edgeL + edgeL/tollerance;
var edges = edge.getParentBRep().getEdges();
for ( var i = 0; i < edges.length; ++i ) {
var edgeLoopL = edges.item(i).getLength();
if ( edgeLoopL> min && edgeLoopL< max)
edges.item(i).selected = true;
}
}

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idk if fillets will be changed for v5
~ an addition - last created on fillet failed, but building the supported faces - to select new created faces

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Hi Tudor, you can select faces that were created by the last run command by using this script in v4:

script: /* Select fillet surfaces */ moi.geometryDatabase.deselectAll(); var breps = moi.geometryDatabase.getLastCreated().getBReps();
for ( var i = 0; i < breps.length; ++i ) { var faces = breps.item(i).getFaces(); for ( var j = 0; j < faces.length; ++j )
{ var f = faces.item(j); if ( f.isNew ) f.selected = true; } }

So for example after doing a fillet that will select all the fillet surfaces.

- Michael

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Cool !

And something for select only "Flat Faces" ? (not especially after the last function)

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Hi Pilou, planar faces can be selected using the detailed object properties dialog.

Select the solid first, then click "Details...", then click the label where it shows the number of faces, then click the label that shows the number of planar faces.

There will be another way in v5 using the Types section of the scene browser.

- Michael

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Ah excellent i have totally forgotten this!

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Idem

I forgot this possibility I knew.
But when I don't use it often, I forget to use this trick.

Thanks for this Michael !

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Ohayo
Is it possible to bind hotkeys to mouse 4/5 and combinations with those ?
~ default moi doesnt support that, any other softwares ?

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