# SCR Streamline Animation Code

## 1. Finding Adjacent List

Note that most of the cases can run correctly in this step, but there has some possibly discover cases will cause the error of finding adjacent list:

**i. Shorthest Streamlines in the frames** 

The short streamlines in the frames may cause the adjacent list order not correct. 

Since the algorithms will miss-matched the shortest Euclidean distance point.

![](/files/-MhmBvwQ1td_N_gJHfLL)

**Current Solution:**  Remove the shortest streamlines manually before finding adjacent list.

**Possible Future Solution:**  Add more sampling point on the current streamlines when finding adjacent.

**ii. Streamlines slope angle is nearly 45**

Streamline of the angle nearly 45 will hard to determine this streamlines is vertical or horizontal, and cause the adjacent order wrong.

![](/files/-MhmDJ6HEnJOv5IJhGIx)

**Current Solution:**  Reverse the adjacent order of current streamline when the loop streamlines occurs.

**Possible Future Solution:**  No idea yet.

**Note:** User are able to manually modification the adjacent list by edit the Config file if wrong adjacent list calculate occurs.

## **2**. Streamline Corresponding Problem

**i. Crossing and Reverse Issues**

For the crossing problem, this is cause by the patch of 2 keyframe position is time-varying.

For the reverse problem, this is cause by the streamlines generation points order. Sometime the streamlines point order is upside down.

![Example of Crossing and Reverse Issues GIF](/files/-MhmHR1uXo4BciyKNyMl)

**Current Solution:** Modified the Config File or Adjust the Streamlines position inside Vpaint

**Possible Future Solution:** 

  1\. Add the constraint of cannot crossing adjacent list

  2\. Determine if the head and tail of the sample points is in reverse position.

## 3. Insertion Streamlines

**i. Boundary Streamlines**

if the current unmatched streamlines is include the boundary streamlines, which means it is unable to interpolation and insert a new streamlines into 2 adjacent streamlines. The program will crash in this condition.

**Possible Future Solution:** 

  1\. Extrapolation the boundary streamlines

  2\. Don't remove the boundary streamlines

## 4. Streamlines Respacing

**(some un-implement yet code)**

* The iteration parameters in the ui panel is not yet set-up.


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