Differences between revisions 6 and 7
 ⇤ ← Revision 6 as of 2016-02-12 14:35:52 → Size: 1525 Editor: BMittan Comment: ← Revision 7 as of 2016-04-19 10:22:32 → ⇥ Size: 1446 Editor: KristoferDrozd Comment: Deletions are marked like this. Additions are marked like this. Line 34: Line 34: The following sample shows the screen output for the most common suboption choice, '2': The following sample shows the command input for the most common suboption choice, '2': Line 36: Line 36: I.E. Line 40: Line 39: (./) I changed that to a standard output sample. Are the indents right??

# Find normal

(lithos Main Menu Option N. Find normal)

## Description

This Main Menu option calculates the normal vector to the maplet in one of several ways.

### Suboptions

When you choose Option N. Find normal from the Main Menu, you will see this set of Suboptions:

```Main Menu: Q 0123O IUCRSG NVAMBX DEPL FZH? n
>n

1. Normal from radius vector
2. Normal from heights
3. Normal from shape
4. Normal from stereo
q. Quit```

1. Normal from radius vector - Sets normal the same as the radius vector. (Rarely used.)

• Note that the normal is the same as the radius vector everywhere if the object is a sphere. Rarely will conditions on an asteroid be such that this option will be correct.

2. Normal from heights - Determines normal from the average of the heights in the maplet by fitting a plane to the current topography. (Used almost exclusively.)

3. Normal from shape - Determines normal from the shape model.

4. Normal from stereo - Determines normal from three common points in two images.

• This option is occasionally used when the shape is extremely challenging and no good model yet exists. It requires manual determination of common points.

## Typical Example

The following sample shows the command input for the most common suboption choice, '2':

```n
2```

(Compiled by JRW)

Find normal (last edited 2016-04-19 10:22:32 by KristoferDrozd)