topic Re: GDL: Ruledshell & Generatrices in GDL

GDL: Ruledshell & Generatrices

Lingwisyer — Tue, 01 Jul 2025 02:28:16 GMT

Hi all,

I have a ruled shell where one end is a pill shape and the other is two 180 degree arcs to form a circle with a mid point. From my understanding, you use the generatrice to inform which node connects to which. So for my case I am wanting the first and final nodes of the pill to connect to the start of the circle, line start (1) and line end (4) to arc start (1), and the second and third node connect to the mid point, line end (2) and arc end (3) to arc end (3?). The result I am getting is that everything seems to connect to the starting node of my circle...

RULEDSHELL mat_Int, mat_Int, !Base mat_Int, mat_Int, mat_Int, mat_Int, mat_Int, 5, 5, 4, 0, tShell, 1, 0, ! transformation matrix 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, ! Bottom Profile xWaste - rWaste, yWaste, 1, xWaste, yWaste, 900, 0, 180, 1+4000, xWaste, yWaste, 900, 0, 180, 1+4000, ! Top Profile -A3/2 + B/2 + xInt, B3/2 + yInt, 2, A3/2 - B/2 + xInt, B3/2 + yInt, 2, B3/2, -180, 2+2000, -A3/2 + B/2 + xInt, -B3/2 + yInt, 2, B3/2, -180, 2+2000, ! transformation matrix 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0.015, ! generatrices 1, 1, 3, 2, 3, 3, 1, 4

Ling.

Betreff: GDL: Ruledshell & Generatrices

runxel — Tue, 01 Jul 2025 09:49:55 GMT

Ling, that is my understanding of the generatrix as well.

Are you able to give an example with is fully parametrized already so we do not have to guesstimate the correct values for your variables?

Re: GDL: Ruledshell & Generatrices

Lingwisyer — Wed, 02 Jul 2025 01:11:59 GMT

Here is a copy of the shell without the offsets.

Re: GDL: Ruledshell & Generatrices

runxel — Wed, 02 Jul 2025 17:17:35 GMT

Try this, this works for me.

Just make sure that both polylines go into the same direction and CCW.

RULEDSHELL mat_Int, mat_Int, mat_Int, mat_Int, mat_Int, mat_Int, mat_Int, 5, 5, 4, 0, tShell, 0, 0, !// transformation matrix 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, !// Bottom Profile 0, rWaste, 1, !#1 0, 0, 900, !#2 0, 180, 1+4000, !#3 0, 0, 900, !#4 0, 180, 1+4000, !#5 !// Top Profile A/2, B/2, 2, !#1 -A/2, B/2, 2, !#2 B/2, 180, 2+2000, !#3 A/2, -B/2, 2, !#4 B/2, 180, 2+2000, !#5 !// transformation matrix 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0.5, !// generatrices 1, 1, 1, 2, 3, 3, 3, 4

Re: GDL: Ruledshell & Generatrices

Lingwisyer — Thu, 03 Jul 2025 02:49:31 GMT

Ah, you rotated the circle 90 degrees. That does work a lot better, but it would appear that my actual issue that the two faces of my shell do not like being so close to each other, so I either get the "thickness" intruding into the hole in the middle, or it spreading out beyond the edges...

I might try using a zero thickness shells to do two SEOs on a poly.

Re: GDL: Ruledshell & Generatrices

Lingwisyer — Thu, 10 Jul 2025 06:46:17 GMT

I forgot there is no SEO with upward / downward in GDL... and you cannot SWEEPGROUP a non-solid...