I'm creating an ios drawing app and would like to understand how to rotate the texture I'm using for drawing to have the texture follow the direction of my stroke.
Sketchbook for iOS and brushes are two apps that Ive seen accomplish this.
Does anyone have any idea of how to achieve this?
Here's an example of the concept that I'm trying to capture: http://drawsketch.about.com/od/learntodraw/ss/pencilshading_5.htm
Attached is a screenshot from the sketchbook app of this in practice.
UPDATE:
I was able to figure this out (thanks to SO community for helping out!) and posted my answer here: https://stackoverflow.com/a/11298219/111856