# \[Archive\] About global/local params and full example **URL:** \ **Category:** SPIS\ **Created:** [29 September 2008 15:16 UTC](https://forum.spis.org/t/archive-about-global-local-params-and-full-example/302 "2008-09-29T15:16:00Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![system](https://forum.spis.org/uploads/default/original/1X/887f7e402a70666bad1816db2c64fefd698b4b0f.png) [@system](https://forum.spis.org/u/system)\ **Post date:** [29 September 2008 15:16 UTC](https://forum.spis.org/t/archive-about-global-local-params-and-full-example/302/1 "2008-09-29T15:16:00Z")
Message by **Aleksandra Chudnovskaya** : Hello! I have some questions and I hope, You’ll help me… If my covering material is not included into the given list how can I include it? (For example, Al). What for in global parametres two streams of ions and electrons are specified? If my discrete device is on a surface of a satellite how should I connect it with the satellite ground through electric nodes? Whether can’t I really arrange the device on the spacecraft ground? Whether should I do in that case an aperture and place the differential device in it? How can I specify, that one of device surfaces is the glass (I have not found such material)? In what system of co-ordinates I draw my spacecsaft in the editor gmsh and how then can I specify a sun direction in global parametres in the “Surface Interactions” (in what system of co-ordinates)?Is there a full example of work with SPIS? From the very beginning and to the end (gmesh+pre-processing+simulation+post-processing)? Thank You, Aleksandra ---
**Author:** ![system](https://forum.spis.org/uploads/default/original/1X/887f7e402a70666bad1816db2c64fefd698b4b0f.png) [@system](https://forum.spis.org/u/system)\ **Post date:** [30 September 2008 17:37 UTC](https://forum.spis.org/t/archive-about-global-local-params-and-full-example/302/2 "2008-09-30T17:37:00Z")
Message by **Benoit Thiebault** : That’s indeed a lot of questions ! I will try to answer them ![]() **If my covering material is not included into the given list how can I include it?** In current SPIS version, this is a bit complex, as you have to edit the materials directly in SPIS-NUM library and compile it. Future versions will solve this issue. **What for in global parametres two streams of ions and electrons are specified?** SPIS is multi-species. By default two populations are defined : thermal ions and thermal electrons. You can define high energy ions and electrons with this second population when you want to model a bi-maxwellian plasma **If my discrete device is on a surface of a satellite how should I connect it with the satellite ground through electric nodes? Whether can’t I really arrange the device on the spacecraft ground? Whether should I do in that case an aperture and place the differential device in it?** I’m not sure I understand your question. If your device is connected to the ground, in the GroupEditor, select the group corresponding to the device and assign ElecNode-0 as Node. **How can I specify, that one of device surfaces is the glass** Glass is currently not available. **In what system of co-ordinates I draw my spacecsaft in the editor gmsh and how then can I specify a sun direction in global parametres in the “Surface Interactions”** In Gmsh, the coordinate system is cartesian. SPIS uses the same coordinate system, so depending on how you designed your spacecraft, you can specify the sun direction using the same coordinates system. **Is there a full example of work with SPIS? From the very beginning and to the end** There is such an example with the training course: [\http://dev.spis.org/projects/spine/home/meeting/mxi/data/083bb6b3c0a8001400c4d16872df8da9](http://dev.spis.org/projects/spine/home/meeting/mxi/data/083bb6b3c0a8001400c4d16872df8da9) ---
**Author:** ![system](https://forum.spis.org/uploads/default/original/1X/887f7e402a70666bad1816db2c64fefd698b4b0f.png) [@system](https://forum.spis.org/u/system)\ **Post date:** [4 October 2008 19:22 UTC](https://forum.spis.org/t/archive-about-global-local-params-and-full-example/302/3 "2008-10-04T19:22:00Z")
Message by **Aleksandra Chudnovskaya** : Thank You very much!!! ---
**Author:** ![system](https://forum.spis.org/uploads/default/original/1X/887f7e402a70666bad1816db2c64fefd698b4b0f.png) [@system](https://forum.spis.org/u/system)\ **Post date:** [10 July 2020 10:02 UTC](https://forum.spis.org/t/archive-about-global-local-params-and-full-example/302/4 "2020-07-10T10:02:28Z")