# CGX does not catch a node groups

**URL:** <https://calculix.discourse.group/t/cgx-does-not-catch-a-node-groups/409>\
**Category:** CalculiX GraphiX\
**Created:** [January 20, 2021, 12:24pm UTC](https://calculix.discourse.group/t/cgx-does-not-catch-a-node-groups/409 "2021-01-20T12:24:34Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [January 20, 2021, 12:24pm UTC](https://calculix.discourse.group/t/cgx-does-not-catch-a-node-groups/409/1 "2021-01-20T12:24:34Z")

</div>

i tried took a test of wedge or prism element performance in simple case, this method based on extrusion of unstructured triangle element. however, it seems catching of a node group using ‘comp’ in CGX commands does not work properly, only partial of nodes in set was shown.

am i miss something in commands? any suggestion for these problem.

 ![2021-01-20 19_13_05-exwedge.fbd - SciTE](https://global.discourse-cdn.com/free1/uploads/calculix/original/1X/427314b2d86f40add77febea1842d5323d9745fe.png)

---

<div class="post-metadata">

**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [January 20, 2021, 3:12pm UTC](https://calculix.discourse.group/t/cgx-does-not-catch-a-node-groups/409/2 "2021-01-20T15:12:22Z")

</div>

Hello,

maybe you have to use the command with down or use both, up and down !?

wbr

---

<div class="post-metadata">

**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [January 20, 2021, 3:36pm UTC](https://calculix.discourse.group/t/cgx-does-not-catch-a-node-groups/409/3 "2021-01-20T15:36:05Z")

</div>

thanks @dichtstoff for looking up my problems,

```
pnt p1 0 0 0
pnt p2 100 0 0
pnt p3 100 50 0
line l1 p1 p2 6
line l2 p2 p3 3
line l3 p3 p1 9
div all mult 1
plot pa all
plus la all
surf s1 l1 l2 l3
plot sa all
seta sg1 s1
elty sg1 tr3u
mesh sg1
swep sg1 bg1 tra 0 0 20 4 a
comp bg1 up
send bg1 abq
seta support A003
comp support up
comp support do
send support abq spc 123
seta load A001

```

using both command ‘up’ and ‘down’ successfully detect node group based on face… but it’s strange for me since surface are differ with i chose previously. defined as ‘s1’ surface not ‘A003’ in this case.

 ![2021-01-20 22_29_43-CalculiX GraphiX](https://global.discourse-cdn.com/free1/uploads/calculix/original/1X/9c49137f4043076ce699184f8a319030218a46f0.png)