shaders/snippets/rotate/rotate.md

Rotate

as far as i understand this function, it functions by multiplying a 2d vector by a mat2 (2x2 matrix as far as i can tell) like this:

[[cos(angle),-sin(angle)], [x, [sin(angle),-cos(angle)]] x y]

creating something like this:

st.x = cos(angle)*st.x - sin(angle)*st.x
st.y = sin(angle)*st.y - cos(angle)*st.y

although i don't fully understand cos and sin's effect on these values, i feel like i'm a step closer to understand these functions