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<p>Greetings Utkarsh!</p>
<p>Your advice is exceptional; the remaining "unwanted" STL
triangles attached to the desired STL surface have been removed. <br>
</p>
<p>A couple of lessons:<br>
</p>
(1) At first the instruction sequence seemed to me a little awkward.
However, after repeated use it became rhythmic. I did find it better
to reset/uncheck <b>Invert Selection</b> of the<b> Edit | Find Data</b>
panel before going to the next location.<br>
<br>
(2) It took a couple of tries for me to discover that the unwanted
fin-like attachments were actually zero-thickness regions with
matching back-to-back STL-triangles -- one for each side, and hence,
it required a second removal go around. (The original 30+ layered
tetrahedral mesh as our Japanese colleagues would say, "was not so
good.")<br>
<br>
(3) A triangular hole required a hand-crafted STL-triangle with a
borrowed normal-vector from a neighbor triangle. After writing out
the datum set, hand editing the STL-file to add in the missing
triangle and renaming a copy of the datum-set, a read and write with
PV showed that PV 'corrected' the normal vector. Whoever wrote that
section of code deserves a pat on the back.<br>
<br>
(4) The PV window with the row of miniature icons in upper-left
corner took me a couple of tries to figure out that add &
subtract were clues to use ctrl & shift keys when making
selections. IMHO, well done.<br>
<br>
(5) Message to myself: "The more you use ParaView, the smarter it
gets."<br>
<br>
Thanks for really great tool!<br>
<br>
Sam Key<br>
<div class="moz-cite-prefix">On 3/21/2017 6:45 AM, Utkarsh Ayachit
wrote:<br>
</div>
<blockquote
cite="mid:CADHSJjCmzuMK4Wx=b3zyPCam29VxkQ0KbbgT2Ejb217Ce57pgw@mail.gmail.com"
type="cite">
<div dir="ltr">You can use the <b>Extract Selection</b> filter.
Before you create the filter, make sure you invert the selection
so that you are removing the selected selected. To do that, once
you've made your selection, go to <b>Edit | Find Data</b> and
then check the <b>Invert Selection </b>check box. Now, from
the dialog itself, you can click the <b>Extract Selection</b> button
to create a new <b>Extract Selection</b> filter. The output of
this filter is <b>Unstructured Grid </b> and STL only supports
<b>Polydata, </b>hence apply the <b>Extract Surface</b> filter
again and then you shall be able to save out the result as a new
STL file.
<div><br>
</div>
<div>Hope that helps.</div>
<div>Utkarsh</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Mar 20, 2017 at 5:18 PM, Samuel
Key <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:samuelkey@bresnan.net" target="_blank">samuelkey@bresnan.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello All,<br>
<br>
I am working with a less than perfect STL surface. I was
able to use PV's Clip filter spheres to remove a number of
spatially isolated undesirable triangle clusters. (With a
new application of the Extract Surface Filter, I was able to
use Save Data to get an updated/revised STL file.)<br>
<br>
I am now working on removing triangles that have a point or
an edge attached like a fish fin to the desired STL surface.
I have successfully selected the undesirable fin-like
triangles. Now, I want to delete (or Clip) these triangles
to remove them from the datum set. Right-click delete does
not appear to be an option?<br>
<br>
Is there some way to delete these selected STL triangles
from the Datum set?<br>
<br>
Regards,<br>
<br>
Sam Key<br>
FMA Development<br>
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