# Difficulty in taking the slice at a specified angle of 78 degree in clockwise direction from vertical axis

**URL:** https://discourse.paraview.org/t/difficulty-in-taking-the-slice-at-a-specified-angle-of-78-degree-in-clockwise-direction-from-vertical-axis/7212
**Category:** ParaView Support
**Created:** [May 12, 2021, 8:10am UTC](https://discourse.paraview.org/t/difficulty-in-taking-the-slice-at-a-specified-angle-of-78-degree-in-clockwise-direction-from-vertical-axis/7212 "2021-05-12T08:10:11Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![proxy](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/p/e19b73/32.png) [@proxy](https://discourse.paraview.org/u/proxy)
#### Post date: [May 12, 2021, 8:10am UTC](https://discourse.paraview.org/t/difficulty-in-taking-the-slice-at-a-specified-angle-of-78-degree-in-clockwise-direction-from-vertical-axis/7212/1 "2021-05-12T08:10:11Z")

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Hello Experts,  
I wanted to take a slice at angle of 78 degree from vertical axis (y-axis). I am confused regarding the convention used in the Paraview. For example: if I put the slice normal as : 1, 0, 0 then it’s clear that it will slice along y axis. But if I used a slice normal as: 1, -1, 0 then it’s a slice at an angle of 45 (I assume) in clockwise direction. But if I used a slice normal as: 1, -45, 0 then it’s a slice at an angle of 0 (I assume) from the vertical axis. By doing all this exercise I am really confused, what is the convention that is followed by taking a slice direction (specified as “Normal” in Paraview). Sorry for asking naive and so confusing question, I have attached the screenshots of all the 3 cases herewith. Any comment/suggestion will be a great help. Thanks in advance.

 ![1_0_0](https://discourse.paraview.org/uploads/default/original/2X/7/7f2553ffa76ef68da02ca01efb95e7db3faa2882.png) ![1_-1_0](https://discourse.paraview.org/uploads/default/original/2X/3/303276b64bc5b04970f77e82e4dc469d41add9a5.png) ![1_-45_0](https://discourse.paraview.org/uploads/default/original/2X/6/62882a26e7d8d2a6b6e7f1a93532eb12f4b482d3.png)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 12, 2021, 11:32am UTC](https://discourse.paraview.org/t/difficulty-in-taking-the-slice-at-a-specified-angle-of-78-degree-in-clockwise-direction-from-vertical-axis/7212/2 "2021-05-12T11:32:21Z")

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a Nornal is a normalized vector orthogonal to the plane:

> **[Normal (geometry)](https://en.wikipedia.org/wiki/Normal_(geometry))**
>
> In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. For example, in two dimensions, the normal line to a curve at a given point is the line perpendicular to the tangent line to the curve at the point.
> A normal vector may have length one (a unit vector) or its length may represent the curvature of the object (a curvature vector); its algebraic sign may indicate sides (interior or exterior).
> In three dimensions, a surface normal, or simply nor...