# Multiple Features

Features finder allows user to find multiple features under one image, also allows to find one feature using multiple finders.

## Multiple Features Under One Image

If there are multiple features to be found in one image, user can add multiple finders under that image, each finder finds one feature.

By default, feature's name is the same with its finder's name, such as "Finder00", "Finder01". Since their names are unique under a features finder, these features are considered as different features.

All the features found in a features finder, regardless of their sources of camera, will be used for pose computing.

## One Feature with Multiple Finder

In applications where the main fiducial mark is contaminated and could not be found by finder, customer usually wants to find another fiducial mark to locate the part. However, to make no difference to pose computation, the second finder should report the same location point of the part as of the first finder. That is to say, to find the same feature point using different finders.

Here is an example of using two finders to find one feature:

1. Add the first finder to find the first fiducial mark, put its output feature location at some obvious place on part such as the intersection of two edge lines on mark.

2. Add the second finder to find the second fiducial mark. Manually move its output feature location to the same place as configured in the first finder.

3. Click Features button, input the same name for Finder00 and Finder01's output features, and click OK.

In AlignPlus, features with the same name are considered as the same feature, only the feature with highest score will be used for pose computing. In this way, whether only one feature is found, or both are found will not affect pose computation result. It's the same case if there are multiple finders.

CAUTION: Moving output origin far away from its found pattern/features may bring down the accuracy of feature finding. User need to consider whether this impact to alignment/assembly result is acceptable or not.