렌즈 플레어

• [0821 박민근] 렌즈 플레어(lens flare)
• http://cg.skku.edu/pub/2013-lee-egsr-matrixflare
• https://github.com/modanhan/Unity-Lens-Flare-2019
• https://opengameart.org/content/lens-flares-and-particles?page=1
• http://john-chapman-graphics.blogspot.com/2013/02/pseudo-lens-flare.html
• https://developer.arm.com/documentation/102259/0100/Dirty-lens-effect