Line

Line

Convergence without the vanishing point

Sight the true top and bottom edges. Divide the near and far verticals into the same number of parts. Connect matching marks. You never need the vanishing point itself.

When a vanishing point is off the page (it usually is) you do not need it. Sight the top edge of the wall with your pencil and draw it at its true angle. Sight the bottom edge and draw that. Now you have the near vertical edge of the wall and the far one. Divide each vertical into the same number of equal parts, say four, and connect the matching marks. Every one of those connecting lines converges correctly toward the invisible vanishing point, and every sill, string course and lintel on that wall sits on one of them.

This is how the architectural draughtsmen worked in the field. Nobody pinned string to a vanishing point on a cathedral close. They sighted two edges and interpolated.

Do the same horizontally for the window positions: divide the top and bottom edges proportionally (not equally; see dividing bays) and drop verticals.

From your kit

The whole kit →
  1. 1Grafwood 2H and H, long points construction lines you can leave in: eye level, vanishing traces, bay divisions.
  2. 2Grafwood F or HB the drawn line over the construction, broken and weighted.
  3. 3Grafwood 2B the few counted accents that make the line read as stone.

Visuals

Estimating convergence when the vanishing point is off the page: measure the near and far heights, divide both into the same number of parts, and connect the matching marksnear edge, 4 partsfar edge, 4partswindow heads, string courses, sills: all sit on these linesSight the top edge and bottom edge with the pencil (the real angles). Everythingbetween is interpolated.You never need the vanishing point. You need two true edges and a ruler for the rest.
FigureTwo sighted edges, matching divisions, correct convergence.

Pitfalls

What

Dividing the near and far verticals into different numbers of parts.

Why

The connecting lines fan wrongly and the wall warps.

Fix

Same number of parts on both. Four is usually enough.