.. toctree::
    :maxdepth: 1
	
Generating Subset Collection for 3D Subset-DIC
===============================================

* Open the :doc:`../components/gui/preprocessor`
* Set the "Camera Mode" DropDown List to **"Both Cameras"**
* In the **left** :doc:`../components/gui/impanel` , load the **first image** in the image sequence for **Camera 1**.
* In the **right** :doc:`../components/gui/impanel` , load the **first image** in the image sequence for **Camera 2**.
* Open the :doc:`../components/gui/tools/subsetedit`
* In the :doc:`../components/gui/tools/subsetedit` choose **Add Subsets**.

The :doc:`../components/gui/tools/subset/addsubset` appears and ask for some parameters of the subsets to be added.

.. image:: imgs/addsubset3D.png
	:alt: alternate text
	:align: center

For a 3D subset DIC-analysis you may define:
	* The size of the subset (default = 20)
	* Wether the initial subset location (in the left view) should be optimized or not. If you are tracking a checkerboard pattern, you may here choose **Corner Finder**. Otherwise, choose **No Optimization**.
	* The optimization type for the right view. If you are tracking a checkerboard pattern, you may choose **Corner Finder** also here. If not, choose **DIC Rigid 2DOF** or **DIC Linear 6DOF**, 
	  and the subset in the right view will be correlated against the subset in the left view using the specified optimization type. 
	  **Note:** You must NOT choose **No Optimization** for the right view, as the subsets in both views must be located at the same "material point" on the specimen surface.

When the "OK"-buttin is pressed in the :doc:`../components/gui/tools/subset/addsubset` an action called **Click to define center of subset** will be active in the left view.

* Click on the image to define a subset in the left view.
* When you have clicked to add a subset in the left view, you are asked to click on the corresponding point in the right view.
* When you have clicked in the right view, a corresponding set of subsets is added.

To add more subsets, Continue and iterate through the three points above until you are done.

In the image below a single subset has been added at the tip of a projectile.

.. image:: imgs/subsetadded.png
	:alt: alternate text
	:align: center

.. hint::
	The subset tracking analysis assumes small deformations/movements of the subset(s) between succeeding images (same as for standard DIC with mesh). To overcome large "jumps" in displacement bewteen
	succeeding images, it is possible to define a :doc:`subsetvelocityvector` to the subsets. 

* When you are happy with the subset collection, you can save it as a file (*scol).

.. image:: imgs/savescol.png
	:alt: alternate text
	:align: center
	:width: 250

.. hint:: 
	It is not required, but you may want to save the subset collection in a subfolder under the image folder, where you also save the input file (in the next step).
	
You are now done making the subset collection for a 2D Subset-DIC analysis.

* Remember where you saved the subset collection file (*.scol) and close the :doc:`../components/gui/preprocessor`