# Contact\_Primary model and Secondary model

**URL:** <https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382>\
**Category:** General Questions\
**Tags:** results\
**Created:** [January 3, 2024, 12:29am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382 "2024-01-03T00:29:37Z")\
**Posts on this page:** 5\
**Page:** 2

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**Author:** ![jsarocena](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/jsarocena/32/2531_2.png) [@jsarocena](https://prepomax.discourse.group/u/jsarocena)\
**Post date:** [January 7, 2024, 5:37am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382/21 "2024-01-07T05:37:48Z")

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@FEAnalyst Appreciate sir how could I determine the node number of the reference point I created. Im just 11 days here since I started to use Prepomax 28Dec2023 and it is very interesting powerful promising FEA tools. Also appreciate any link where I can get a reference to learn how to Edit CalculiX Keywords. Thanks a lot.  
 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/8/86b32ab20b3f9b335bca4a25680c2a98f17911c9.png).

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**Author:** ![arnie](https://avatars.discourse-cdn.com/v4/letter/a/ba9def/32.png) [@arnie](https://prepomax.discourse.group/u/arnie)\
**Post date:** [January 7, 2024, 6:32am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382/22 "2024-01-07T06:32:35Z")

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Calculix manual is a good start

[http://www.dhondt.de/ccx\_2.21.pdf](http://www.dhondt.de/ccx_2.21.pdf)

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<div class="post-metadata">

**Author:** ![jsarocena](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/jsarocena/32/2531_2.png) [@jsarocena](https://prepomax.discourse.group/u/jsarocena)\
**Post date:** [January 7, 2024, 8:09am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382/23 "2024-01-07T08:09:08Z")

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Thanks a lot for your sharing.

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**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:** [January 7, 2024, 8:53am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382/24 "2024-01-07T08:53:49Z")

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> [@jsarocena](#):
>
> Would I know how did you connect the upper reference point since there is no Rigid Body assigned?

That rigid body consisting of reference points of other rigid bodies is defined in Keyword Editor. Open it and you will see the edits highlighted. Its usage is simple - you just have to add keywords following the CalculiX syntax described in User’s Manual.

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<div class="post-metadata">

**Author:** ![jsarocena](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/jsarocena/32/2531_2.png) [@jsarocena](https://prepomax.discourse.group/u/jsarocena)\
**Post date:** [January 7, 2024, 9:15am UTC](https://prepomax.discourse.group/t/contact-primary-model-and-secondary-model/1382/25 "2024-01-07T09:15:14Z")

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> [@FEAnalyst](#):
>
> you just have to add keywords following the CalculiX syntax described in User’s Manual.

Thanks a lot. 😍

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