# Roughness Map Description Error?

**URL:** <https://forums.kodeco.com/t/roughness-map-description-error/43883>\
**Category:** ARKit by Tutorials\
**Created:** [June 22, 2018, 7:50pm UTC](https://forums.kodeco.com/t/roughness-map-description-error/43883 "2018-06-22T19:50:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![990adjustments](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/990adjustments/32/81494_2.png) [@990adjustments](https://forums.kodeco.com/u/990adjustments)\
**Post date:** [June 22, 2018, 7:50pm UTC](https://forums.kodeco.com/t/roughness-map-description-error/43883/1 "2018-06-22T19:50:34Z")

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Just purchased the book and loving the it so far.

On page 85 of the book you describe the roughness map as:

> These maps are greyscaled textures, Where the color black represents extremely rough surfaces, and the color white represents extremely smooth surfaces.

In most games engines and from my experience, the roughness map reads white (1.0) as rough and black (0) as smooth. Glossiness maps are the opposite, white (1.0) smooth and black (0) as rough. You invert one or the other depending on the application’s workflow.

Not sure if it’s a mistake but is SceneKit reading these maps differently where black (0) is rough and and white (1.0) smooth as described in the book?

Erwin

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**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\
**Post date:** [June 29, 2018, 9:04pm UTC](https://forums.kodeco.com/t/roughness-map-description-error/43883/2 "2018-06-29T21:04:58Z")

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@paradox927 Can you please help with this when you get a chance? Thank you - much appreciated! :]

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**Author:** ![shogunkaramazov](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/shogunkaramazov/32/108826_2.png) [@shogunkaramazov](https://forums.kodeco.com/u/shogunkaramazov)\
**Post date:** [November 15, 2018, 4:38pm UTC](https://forums.kodeco.com/t/roughness-map-description-error/43883/3 "2018-11-15T16:38:11Z")

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@990adjustments Do you still have issues with this?