When drawing in design situations, shading can help make drawings more understandable. Shading can tell our eyes that something is behind something else or can help define overlapping materials.
For our intents and purposes, hatching is a quick and easy way to achieve shadows.
When we hatch, we use straight lines that emanate from an overlapping edge or surface. The closer we make the hatches, the darker the shaded area will be perceived. The wider and more spaced out the hatches, the lighter the surface will be perceived.
Solid with hatching
Not how the hatches are individual straight lines. Lift your pen after drawing each hatch line.
Avoid squiggling hatches
Here, the hatches were created by squiggling the pen back and forth.
Gradient Hatching for Pockets
For recessed surfaces (pockets)...
Create hatch strokes that are dense and packed together and slowly space out.
