# ID on complicated model
**URL:** https://discourse.shapr3d.com/t/id-on-complicated-model/7826
**Category:** Modeling Questions
**Created:** [May 30, 2020, 6:46am UTC](https://discourse.shapr3d.com/t/id-on-complicated-model/7826 "2020-05-30T06:46:08Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Bizzaro](https://discourse.shapr3d.com/u/Bizzaro)
#### Post date: [May 30, 2020, 6:46am UTC](https://discourse.shapr3d.com/t/id-on-complicated-model/7826/1 "2020-05-30T06:46:08Z")
I need to make the inner diameter of this ring smaller but also keep all the triangles proportional. I have no idea how. Everything I have tried hasn’t worked.
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### Author:  [@andrew](https://discourse.shapr3d.com/u/andrew)
#### Post date: [May 30, 2020, 1:13pm UTC](https://discourse.shapr3d.com/t/id-on-complicated-model/7826/2 "2020-05-30T13:13:11Z")
This is the problem I have with direct modelling; it is _fantastic_ as long as you know what you want when you set out, but I don’t see how you can modify something such as a diameter used early on without completely wrecking the shape.
I am hoping I am just ignorant of how to do this with something like Shapr3d. It seems such a basic problem that I feel I must just not know how to do it.
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### Author:  [@Bizzaro](https://discourse.shapr3d.com/u/Bizzaro)
#### Post date: [June 4, 2020, 9:27am UTC](https://discourse.shapr3d.com/t/id-on-complicated-model/7826/3 "2020-06-04T09:27:25Z")
So no one who works at Shapr has any advice on this?
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### Author:  [@Istvan](https://discourse.shapr3d.com/u/Istvan)
#### Post date: [June 4, 2020, 12:00pm UTC](https://discourse.shapr3d.com/t/id-on-complicated-model/7826/4 "2020-06-04T12:00:29Z")
Unfortunately this is a great example where parametric modeling is more powerful than direct modeling. I don’t see an easy way to do it with DM.