Grease Pencil has a special set of viewport real-time visual effects that can be apply to the object.
These effects treat the object as if it was just an image, for that reason they have effect on the whole object and cannot limit their influence on certain parts like layers, materials or vertex group as with modifiers. Also unlike modifiers, they can not be applied to the object.
The effects are extremely dependent on the zoom and orientation of the viewport or camera. So keep in mind that they may vary with viewport or camera changes.
视觉效果主要用于快速视图可视化，对于最终生产渲染来说不太可靠。如果想要使用效果更精确，建议使用 合成器 。