• Find normal

This option will calculate the normal vector to the maplet in various ways.

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

1. Normal from radius vector - The normal is set to be the same as the radius vector. Keep in mind 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 - The normal is determined from the average of the heights in the maplet, by fitting a plane to the current topography. This option is the one that will be used almost exclusively.

3. Normal from shape - The normal is determined from the shape model.

4. Normal from stereo - Determine the 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.

Most Common Usage

The vast majority of the time option "2" is used.

I.E.

n

2