[Solved] Bug??? ... Frustrated with extrusions .... I get inconsistent results sometimes...

[celer]

So I'm expecting to generate a mold for casting, I'm getting closer to getting what I want which should look like this:

But I'm having some challenges, when try to do an extrusion for the seam:

def extrude(target=coat.SceneElement,amount=int):

    coat.Scene.sculptRoot().unselectAll()

    target.select()

    print("Extruding "+target.name()+" by "+str(amount))

    def setExtrusion():

        coat.ui.setSliderValue("$ExtrudeParams::Extrusion",amount)

        coat.ui.cmd("$DialogButton#1")

    coat.ui.cmd("$ExtrudeVO",setExtrusion)

    coat.ui.wait("$ExtrudeVO",30)

And then do an intersection (is the coat.ui.wait(...) even needed, I have no idea.

def intSeam(target=coat.SceneElement,width=int):

    bbox=target.Volume().calcWorldSpaceAABB()

    center=bbox.GetCenter()

 

    size=bbox.GetSize()

    size.x=width

 

    # Shift this up by the seam size amount

    center.z=center.z-15

 

    print("Intersecting seam "+target.name()+" "+str(width))

    sbox=coat.box(center,size)

    sbox.intersect(target.Volume())

like so:

    mold_seam=pmold.duplicate()

    mold_seam.rename("mold_seam")

    extrude(mold_seam,15)

 

    # This fails sometimes

    intSeam(mold_seam,10)

 

It just doesn't do the intersection sometimes, sometimes running the script 10 times, 9/10 times it will fail, and won't perform the intersection, sometimes restarting 3D Coat will cause it to work  Sometimes it works and I can't get it to fail, it's very inconsistent. I either don't understand something, or there is a bug. I'm so excited about python scripting 3D Coat but it's a bit buggy. Previously I was getting very weird results with extrusions, which I posted about in another forum thread, but a restart seems to have fixed that. 

I either think there is a race condition or a cache invalidation problem - it feels like a bit of both, restarting it fixes is, so seems like a cache validation problem, but then also it feels like a bit of a race condition - is the extrusion finishing before the intersection is complete?

 

negative_mold_test.3b head_mold.py

Edited July 2, 2023 by celer
to clarify how it fails

[Dmitriy Nos]

4 hours ago, celer said:

9/10 times it will fail

Did you submit a crash report via the feedback form?

[Elemeno]

cant you just use a split command??

[celer]

17 hours ago, Oleg_Shapo said:

Did you submit a crash report via the feedback form?

I can, it doesn't crash it just fails to perform the intersection. 

[celer]

15 hours ago, Elemeno said:

cant you just use a split command??

not for the operation I'm trying to do, I will eventually end up using split or subtract to split the mold in two

[Andrew Shpagin]

On my side script runs correctly. But try adding coat.io.step(2) after intersection to ensure that mesh operation finished:
 

sbox=coat.box(center,size)

sbox.intersect(target.Volume())

coat.io.step(2)

 

[Andrew Shpagin]

Other workaround is to use mesh instead of primitive:

sbox = coat.Mesh.box(center,size)

sbox.toVolume(target.Volume(), op=coat.BoolOpType.BOOL_INTERSECT)

[Andrew Shpagin]

If I will loose this thread please remind me at andrewshpagin@gmail.com, I want to make python scripting to be really solid.

[celer]

Thanks for your response, I'm back at this now, I took two months off a computer to see if helped me recover my hands after an RSI from software dev.

I will send you an email as I'm still having issues.