# Aquarell rooftop sketch: use two sets of converging lines for a street corner

Language: en
Canonical: [Aquarell rooftop sketch: use two sets of converging lines for a street corner](<https://allluckly.cn/en/guides/aquarell-city-rooftops/>)
中文：[中文 HTML](<https://allluckly.cn/guides/aquarell-city-rooftops/>)
English: [English HTML](<https://allluckly.cn/en/guides/aquarell-city-rooftops/>)
Published: 2026-10-23T00:00:00+08:00
Modified: 2026-10-23T10:34:07+08:00
Author: Bison

Draw three simplified corner buildings using a horizon, two convergence directions and roof thickness to establish space, then add a few windows.

English translation of the [Chinese original](<https://allluckly.cn/guides/aquarell-city-rooftops/>), translated on 2026-10-23. The article body uses automated translation; app descriptions, historical reading notes and video subtitles receive separate editorial checks. Original publication dates, attribution, code and version notes are retained.

A street-corner sketch does not need every window. As long as the two sets of horizontal edges converge consistently, the houses can occupy the same space. This exercise uses three simplified houses: establish the corner and roofs with sketch lines, then suggest everyday life through color shapes and a few windows. Draw every guide manually without relying on an automatic perspective grid.

## Establish eye level first

Create a 1600×1100-pixel landscape canvas. On the sketch layer, draw a horizontal line about 500 pixels from the top as the horizon. Place the main building's street-corner vertical slightly left of center, about 700 pixels tall. Above the horizon, show the underside of the roof or less of its top surface; below it, depict the walls according to the chosen viewpoint. Keep things simple and do not mix upward and downward views.

Divide the main building's leftward and rightward edges into two groups. Both converge toward directions on the horizon, but their vanishing points may lie outside the picture; do not force them onto the canvas. Estimate the directions with a few faint guides so nearby and distant eaves do not slope inconsistently. Place a smaller building on the right and show only part of a third behind the left side.

## Use large wall shapes instead of dense line art

On the main color layer, block in the building's two walls: light warm gray on the left and slightly darker gray-brown on the right. They share one street-corner vertical, with no background gap between them. Keep vertical edges roughly upright and direct the horizontal edges toward their respective convergence directions. A blocking brush can be about 80 to 120 pixels. Leave the windows for later.

Make rear buildings closer in color to the background and slightly lower in contrast. Giving every building a different vivid color can bury spatial relationships under decoration. The main building's walls should differ clearly in value without becoming excessively dark. Assume light from the upper left, with the right wall darker. Shadow and perspective are separate relationships: a wall facing right is not a reason to arbitrarily change its geometric direction.

## Give the roof thickness before adding tiles

Draw a sloping roof above the walls, connecting the ridge and eaves directions to the building's structure. Fill the roof plane with gray-red or gray-blue, then add a narrow dark strip along the lower edge for thickness. Extend the roof about 30 to 50 pixels beyond the wall. The visible overhang may differ on each side with the viewpoint, but the roof should not look like a triangle pasted directly onto the wall.

Suggest roof tiles with just a few short lines following the roof plane. Space nearby lines slightly farther apart and distant lines more closely, leaving some areas blank. Do not draw a regular grid and paste it onto the roof; a grid that does not converge in perspective looks flat. Give the main building the clearest eaves and use fewer lines on rear roofs to preserve depth.

## Arrange windows along the wall's direction

Start with two or three windows on each face of the main building. Their top and bottom edges should follow the wall's direction, while their vertical edges remain roughly vertical. Window widths and spacing can gradually compress farther from the street corner. Use dark-gray blocks for the openings, then add light reflections or warm light in only a few windows. Not every window needs a complete frame.

Check whether windowsills and eaves follow the same convergence group. A building twists if the eaves slope upward while the windowsills slope sharply downward. Temporarily show the sketch guides to correct them, then hide the guides and continue painting. A few correctly placed windows are better than a dozen misplaced ones added for bustle.

## Connect the buildings with the street and cast shadows

Block in the lower street with light gray as a large quiet area, and add a contact shadow along the main building's base. Extend the cast shadow toward the lower right. Its shape may be simplified, but it must connect to the building at its origin. Narrow the distant road instead of carrying an equally wide band into the background. A thin streetlamp or potted plant can provide scale; keep it away from the main corner line.

Keep the sky pale and add at most one simplified cloud, without a complicated distant scene. For a separate cloud exercise, see [Cumulus cloud shape exercise](<https://allluckly.cn/en/guides/aquarell-cloud-shapes/>); here it only needs to support the roofs. For color hierarchy, see [Warm-and-cool still-life exercise](<https://allluckly.cn/en/guides/aquarell-warm-cool-still-life/>), letting one warm roof echo the cool sky.

## Preserve a sketch-like feel with a little irregularity

Once the structure is stable, let some lines break, leave some wall edges incompletely filled, and allow slight differences in window size. A sketch-like feel comes from controlled simplification, not making every straight line crooked. Keep the main building's corner, eaves, and bottom edges clearly related so other details have room to loosen up.

Zoom out and check the depth order of the three buildings: the main building should be clearest, the one on the right next, and the rear one weakest. If the buildings remain stable after hiding the sketch, there is no need to trace every guide. Before export, remove any visible vanishing-point marks or extension lines. Keep the sketch layer in the original for review.

## Common problems and comparison exercises

**Why does the house seem to lean to one side?** First check whether the main verticals lean unintentionally, then whether the edges on each wall converge consistently. Do not try to fix it simply by scaling the whole building narrower. Leaning often comes from inconsistent directions in a few important lines. Correct the street-corner vertical first, followed by the eaves and bottom edges.

**Must it be precise enough to measure with a ruler?** This is a hand-drawn sketch, so local inaccuracies are acceptable, but lines in the same group should share a directional trend. In the next drawing, keep the three buildings and raise the horizon to compare how much roof becomes visible. Changing only the viewpoint makes the spatial relationship easier to understand.

You can also cover all the windows with your hand and look only at the roof and wall shapes. If the space still reads, the main directions are organized. If it immediately becomes a collection of crooked paper shapes, revisit the corner line and eaves. Windows add scale and a sense of life; they should not be responsible for correcting the building's structure.

## Sources and applicable version

Use [Aquarell App Store description](<https://apps.apple.com/cn/app/id1591340577>)Based on publicly described canvas, brush, and layer capabilities, checked against version 1.0.5 on October 23, 2026. The perspective guides and buildings are drawn manually. Numbers are exercise suggestions, and the interface may change between versions.