# Contact pair search broken for surface geometries

**URL:** <https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171>\
**Category:** Bug Reports\
**Created:** [December 28, 2025, 11:34am UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171 "2025-12-28T11:34:23Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [December 28, 2025, 11:34am UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/1 "2025-12-28T11:34:23Z")

</div>

Hi,

it seems that the contact pair search is broken for surface geometries (in 3D and 2D model spaces). The following error appears:

 ![search pairs error](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/2/262c0785cc107df72f562757d58175943cde6597.png)

The same happens when surfaces are positioned one above the other.

I tested it in v2.4.0 and v2.4.3.

[Contact pair search error.pmx](https://prepomax.discourse.group/uploads/short-url/f69zStHKEeSefu6IjW5YaMREEzg.pmx) (80.1 KB)

---

<div class="post-metadata">

**Author:** ![lukerickert](https://avatars.discourse-cdn.com/v4/letter/l/53a042/32.png) [@lukerickert](https://prepomax.discourse.group/u/lukerickert)\
**Post date:** [December 28, 2025, 10:08pm UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/2 "2025-12-28T22:08:48Z")

</div>

one other strange thing is when I went to select parts to assign meshing parameters it highlights all of the parts but doesn’t select them all if that makes any sense. I have a screen capture somewhere showing it.

---

<div class="post-metadata">

**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [January 18, 2026, 5:14pm UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/3 "2026-01-18T17:14:29Z")

</div>

I have fixed this problem and will include the solution into new developer version.

---

<div class="post-metadata">

**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [February 2, 2026, 5:33pm UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/4 "2026-02-02T17:33:05Z")

</div>

Can I close this topic?

---

<div class="post-metadata">

**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [February 2, 2026, 5:35pm UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/5 "2026-02-02T17:35:41Z")

</div>

Yes, let’s close it, thanks.

---

<div class="post-metadata">

**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [February 2, 2026, 5:35pm UTC](https://prepomax.discourse.group/t/contact-pair-search-broken-for-surface-geometries/3171/6 "2026-02-02T17:35:50Z")

</div>