topic Re: Issue with a morphed slab in Modeling

Issue with a morphed slab

Aussie John — Wed, 24 May 2023 17:23:10 GMT

Hi have an element made from a slab - rectangle with a half round end. If I convert to morph and apply a radius edge the curve is slightly different to the straight line (leaving a small raised junction) - In the section you can see the different radius of the curve in the background and in the 3 d a change in the reflection.

I have actually printed this in 3d and the bump is real.

Any thoughts on how to generate this correctly.

Re: Issue with a morphed slab

DGSketcher — Mon, 08 Oct 2018 08:33:24 GMT

Morphs are prone to faceting which is where the bump may have come from.

I would look at at forming this with a slab and adding a perimeter wall with a custom profile containing the curved edge. Not sure how that works with 3D printing but in modelling terms you may get a more accurate representation.

Re: Issue with a morphed slab

Carstenem — Tue, 09 Oct 2018 01:51:35 GMT

Try to double segment the morph a couple of times. Do it twice first and see if that helps. Morph needs to be selected.

Re: Issue with a morphed slab

Barry Kelly — Tue, 09 Oct 2018 02:20:00 GMT

Carstenem wrote:
Try to double segment the morph a couple of times. Do it twice first and see if that helps. Morph needs to be selected.

I am not sure this will help as it seems that the chamfer facet size on the straight edge is different to the one on the curved edge.

The only thing I can think of is to create a flat morph polygon that is the shape of the chamfer you want. and then tube it around the slab.

Barry.

Re: Issue with a morphed slab

Carstenem — Tue, 09 Oct 2018 02:31:02 GMT

Yes that is annoying but still worth a try to double the segments. The more segments you get the less the difference between the straight and curved facet. I like your suggestion Barry, that could work just fine.

Re: Issue with a morphed slab

Aussie John — Fri, 12 Oct 2018 03:53:49 GMT

Barry wrote:
The only thing I can think of is to create a flat morph polygon that is the shape of the chamfer you want. and then tube it around the slab.
Barry.

Barry
After pondering it for a while that was my thought too.
Tube is a bit of a pain as the profile has to be coded in segments although I fairly sure the XY plane curve can use the additional status codes.
I don't suppose you still have the GDL for the tube you setup?
cheers John

Cheers John

Re: Issue with a morphed slab

Barry Kelly — Fri, 12 Oct 2018 04:00:24 GMT

That wasn't GDL that I did.
Just a slab with a curved end.
Add a polygon morph to one end and then use pet palette tube option to extrude it around the slab.

If I was scripting this then i would probably just use FPRISM or HPRISM.

Barry.

Re: Issue with a morphed slab

Daniel Kovacs — Mon, 15 Oct 2018 12:09:50 GMT

Hello All,

I looked at it and it definitely looks like a bug, I added it to our list (#254344). Interestingly enough, when you select a single straight edge on a morph and fillet it, then it works file, but if you have multiple edges selected, then the curve won't be tangential to the faces.

I think what Barry did, is just create the curve manually from a flat morph, and then use the tube method from the pet palette to extrude it. I also tried that, and it works like a charm. I think this is the best workaround until a fix.

Regards,