# Why are CSG representations mandated for DTV?

**URL:** <https://forums.buildingsmart.org/t/why-are-csg-representations-mandated-for-dtv/2311>\
**Category:** Developers\
**Created:** [January 23, 2020, 8:12pm UTC](https://forums.buildingsmart.org/t/why-are-csg-representations-mandated-for-dtv/2311 "2020-01-23T20:12:07Z")\
**Posts on this page:** 1\
**Showing post:** 39

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**Author:** ![ReD\_CoDE](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/red_code/32/226_2.png) [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\
**Post date:** [February 14, 2020, 4:35am UTC](https://forums.buildingsmart.org/t/why-are-csg-representations-mandated-for-dtv/2311/39 "2020-02-14T04:35:09Z")

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> [@ReD\_CoDE](#):
>
> Today we need to find which paradigms are the best and the majority use/implement? and nominate them. Which I think today (IFC4) IFC has had a lot of improvement in geometry/topology (LoD)

> [@Federated Decentralised CDE](https://forums.buildingsmart.org/t/federated-decentralised-cde/2321/22):
>
> I think at least there are “one” standard that can help bSI and also us a lot and it’s STEP AP 242 When we decouple geometry and semantics we better can see which areas still need improvements Let’s focus just on geometry: There’re a lot of different geometry (modeling) paradigms that each one is good for an or some specific purpose(s), for instance, some are good for geometric visual representation, other in some analysis and simulations, other in other areas like geometric behaviors like c…

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