# Should the surfaces have thickness in Rhino for analyses?

**URL:** <https://discourse.ladybug.tools/t/should-the-surfaces-have-thickness-in-rhino-for-analyses/9713>\
**Category:** honeybee-legacy\
**Tags:** daylight, rhino-6\
**Created:** [May 12, 2020, 6:26pm UTC](https://discourse.ladybug.tools/t/should-the-surfaces-have-thickness-in-rhino-for-analyses/9713 "2020-05-12T18:26:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Farzam](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/farzam/32/15292_2.png) [@Farzam](https://discourse.ladybug.tools/u/Farzam)\
**Post date:** [May 12, 2020, 6:26pm UTC](https://discourse.ladybug.tools/t/should-the-surfaces-have-thickness-in-rhino-for-analyses/9713/1 "2020-05-12T18:26:20Z")

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Hey Guys,

I have a question; should the surfaces have a thickness in Rhino for accurate analyses? (for both thermal and daylight) in other words, can I just extrude a curve with no thickness?

Thanks in advance!

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**Author:** ![mostapha](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/mostapha/32/15244_2.png) [@mostapha](https://discourse.ladybug.tools/u/mostapha)\
**Post date:** [May 12, 2020, 8:15pm UTC](https://discourse.ladybug.tools/t/should-the-surfaces-have-thickness-in-rhino-for-analyses/9713/2 "2020-05-12T20:15:38Z")

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For an energy model the thickness is defined in material description. The geometry should be a single face.

For daylighting the mode detail you add the more accurate the results will be.

You can create the room using mass-to-zone component and then add the details as HB-Surfaces. The zone will be connected only to the energy simulation component but you will connect both the zone and the HB-Surfaces to the Radiance simulation.

If you want to include the extra details as shadings in the energy model you should use the context component.

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<div class="post-metadata">

**Author:** ![Farzam](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/farzam/32/15292_2.png) [@Farzam](https://discourse.ladybug.tools/u/Farzam)\
**Post date:** [May 12, 2020, 9:21pm UTC](https://discourse.ladybug.tools/t/should-the-surfaces-have-thickness-in-rhino-for-analyses/9713/3 "2020-05-12T21:21:02Z")

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@mostapha thank you very much so there is no need to have a thickness in Rhino geometry (no extrusion for closed curves but rather extruding single curves or creating surfaces from points).

Thank you very very much.