So what can we learn from this tutorial? Obviously, it is a common practice for this type of effect to first use wind to create radial lines and then use polar coordinates to adjust the radial lines to the desired angle. The key is how to use polar coordinates to adjust the radiation angle. For the convenience of illustration, I made a 200x200 square and drew a horizontal or vertical line every 40 pixels. Let's take a look at the conversion method of the polar coordinate filter. The first is polar coordinates to rectangular coordinates. In the case of horizontal lines, it doesn’t seem to be of much use…
The situation of the vertical lines seems to be similar to that of the horizontal lines, and I don't see any use.
However, the situation from rectangular coordinates to polar coordinates is quite different. Horizontal lines will become circles and vertical lines will become radial shapes.
