First of all, according to the principle that light shines from one direction, the lines that light can shine on should be removed. Through experiments, taking light from the upper left corner has the best stereoscopic effect.
Then write the strokes into a hollow closed shape. Simple horizontal and vertical strokes are the best, and this step can be omitted after proficiency.
Imagine the light coming from the upper left corner. Obviously, the horizontal line above and the vertical line on the left must be removed.
Finally, if you meet the intersection, first disconnect the lines, and the closed shape is composed of lines, so that you can write three-dimensional words.