# How to Rotate A Plane Normal 90 degree downward?

**URL:** <https://forums.unrealengine.com/t/how-to-rotate-a-plane-normal-90-degree-downward/452748>\
**Category:** Rendering\
**Tags:** direction, normal, slide, unreal-engine, Blueprint, question\
**Created:** [July 24, 2019, 4:03am UTC](https://forums.unrealengine.com/t/how-to-rotate-a-plane-normal-90-degree-downward/452748 "2019-07-24T04:03:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jamesant8](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jamesant8](https://forums.unrealengine.com/u/Jamesant8)\
**Post date:** [July 24, 2019, 4:03am UTC](https://forums.unrealengine.com/t/how-to-rotate-a-plane-normal-90-degree-downward/452748/1 "2019-07-24T04:03:53Z")

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Help! I can’t find a solution to rotate a plane normal 90 degree downward.

To put it this way, what I’m trying to achieve is to let a actor slide downward on a angled plane. I can’t use plane constraint normal cause I’m not using character movement. I was trying to find the slide direction and add force to the actor to that direction.

I tried to calculate the slide direction using plane normal but I can’t figure out how to do it.

Someone please help! Thanks.

![283154-question.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/e/4/7e462b4942891773de958e27be44ca02ca447d52.jpeg)