# SubDiv in MR

**URL:** https://forum.highend3d.com/t/subdiv-in-mr/46435
**Category:** Maya
**Tags:** mental-ray
**Created:** [May 11, 2004, 6:49am UTC](https://forum.highend3d.com/t/subdiv-in-mr/46435 "2004-05-11T06:49:42Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![damn666](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/d/73ab20/32.png) [@damn666](https://forum.highend3d.com/u/damn666)
#### Post date: [May 11, 2004, 6:49am UTC](https://forum.highend3d.com/t/subdiv-in-mr/46435/1 "2004-05-11T06:49:42Z")

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Hi  
I have a car in SubDiv and it will not render in MR except in poly mode, why?

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### Author: ![joojaa](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/j/5daacb/32.png) [@joojaa](https://forum.highend3d.com/u/joojaa)
#### Post date: [May 12, 2004, 9:56am UTC](https://forum.highend3d.com/t/subdiv-in-mr/46435/2 "2004-05-12T09:56:57Z")

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Mar requires subdivs to have four sides for all the faces... or than all tris!

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### Author: ![sporadic](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/s/a88e57/32.png) [@sporadic](https://forum.highend3d.com/u/sporadic)
#### Post date: [May 15, 2004, 6:53am UTC](https://forum.highend3d.com/t/subdiv-in-mr/46435/3 "2004-05-15T06:53:22Z")

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As said above, you have to have only quads. You can convert your SubD to quads using the Collapse Hierarchy option in the Subdivision Surfaces menu.