Rotation UV

float2 rotateUV(float2 uv, float degrees) {
                const float Deg2Rad = (UNITY_PI * 2.0) / 360.0;
                float rotationRadians = degrees * Deg2Rad;
                float s = sin(rotationRadians);
                float c = cos(rotationRadians);
                float2x2 rotationMatrix = float2x2(c, -s, s, c);
                uv -= 0.5;
                uv = mul(rotationMatrix, uv);
                uv += 0.5;
                return uv;
            }

sincos 이라는 함수도 있던걸로 생각되는데. 

https://community.unity.com/t5/Shaders/Radial-Blur-Shader-Texture/td-p/2612424