The Perspective Drawing Guide by Spencer Nugent

Author:Spencer Nugent
Language: eng
Format: epub, mobi
Publisher: Rocky Nook Inc.

Notice also the shape of the shadow and how the lines of the shadow seem to converge to a vanishing point to the left and right in your scene.

Cubes are simple objects, because of the four easily identifiable corners of their top surface. The resultant shadow, while simple, shows how the lines behave relative to vanishing points and the light source.

Natural Light Shadows Demonstration: Cylinders, Spheres, and Cones

A cylinder is a bit more complicated to cast a shadow on the ground plane. You can, however, use the methodology of casting a cylinder’s shadow to determine the shape of the shadow of other curvilinear objects that may cast a shadow onto a ground plane surface.

To cast a shadow, start by drawing a simple cylinder. Draw two ellipses connected by vertical lines to create the volume of the cylinder. Like the cube example, draw through to the backside to show the structure of the cylinder. You can draw this cylinder in two- or three-point perspective.

Pick any number of points along the top of the cylinder. I tend to divide the top of the cylinder into eight parts by drawing four lines that intersect at the center of the top surface.

Project lines down to the base of the ellipse from each of these points that you selected to find the corresponding points at the base of the cylinder. You should now have eight points on top and eight points on the bottom of the cylinder to calculate your shadow.

Much like for the cube, project lines along the ground plane and project lines down from your chosen light source direction to intersect your lines along the ground plane. These eight intersecting points are the points you need to form the shadow. Complete the shape by drawing lines tangent to the new ellipse on the ground plane. Much like the cube, depending on your light location, you may have points on the inside of the silhouette of your cylinder. Focus on the overall shape of the cast shadow that was plotted.

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