Drawing Techniques: Line, Form, Shading and Perspective
This domain tests control of line, construction of form, logical shading and believable perspective. Expect questions on line quality, light logic, one-point and two-point perspective, and the difference between outline and volume.
Core rules
- Use contour lines to describe edges and gesture lines to capture action. Vary line weight: heavier lines for near edges and shadow, lighter lines for distance.
- Build form from simple masses: cube, cylinder, sphere and cone. Check proportion before detail.
- Shading follows light logic: highlight, midtone, core shadow, reflected light and cast shadow. Hatching, cross-hatching, stippling and blending are means, not ends.
- In perspective, the horizon equals eye level. Orthogonal lines converge at vanishing points on the horizon. In one-point perspective, front horizontals and verticals stay true; in two-point perspective, verticals stay vertical while two sets of horizontals converge.
Worked example
Draw a table in one-point perspective. Set the horizon at eye level and a vanishing point on it. Draw the front edge of the table as a true horizontal. Send the side edges back as orthogonals to the vanishing point. Keep table legs vertical. Shade with light from the upper left: top planes are light, front planes mid, right side and cast shadow dark. The cast shadow falls to the lower right, opposite the light.
Traps
An outline alone does not create form. Do not shade with black only; use value shifts. Ellipses must be rounded, not pointed. Cast shadows must agree with the light source. Do not tilt verticals in one-point perspective.
Key points
- Line weight communicates nearness and shadow.
- Construct forms from simple masses first.
- Shading requires a consistent light source.
- Horizon equals eye level in perspective.
- Cast shadows fall opposite the light.