Light and Shadow
SHADE exists when a surface is turned away from the light source.SHADOW exist when a surface is facing the light source but it is prevented from receiving light by some intervening objects.
Shade and shadow naturally exist only when there is light. Light generally is of two types, depending on its source. One type produces a pattern of parallel light rays, other a radial pattern.
The Sun, of course, radiate light in all directions, but the rays reaching the earth, being 93 million miles from their source, are essentially a small handful of single rays virtually parallel to one another. Therefore, when drawing with sunlight the rays of light should be considered parallel.
The Sun, of course, radiate light in all directions, but the rays reaching the earth, being 93 million miles from their source, are essentially a small handful of single rays virtually parallel to one another. Therefore, when drawing with sunlight the rays of light should be considered parallel.
Length and Direction of Cast Shadows
To calculate the length and direction of a cast shadow, follow the steps described in the sequences of illustrations shown below. Further examples of how cast shadows work show you what happens in a variety of lighting and compositional situations.
Knowing how to do this is useful when you are drawing from your imagination or when cast shadows are obscured by objects you don't want to include in your picture.
1. To calculate length and direction of a cast shadow, first locate the light source, and then locate the point directly beneath the light on the surface (plane) receiving the cast shadow.Make a mark ot the imagined point of contact. (When the sun is close to the horizon, the horizon is the point of contact.)
2. From this mark, draw lines through the outer edges of the part of the object touching the ground. This will give us the direction and width of the cast shadow. (Treat the object as though it were transparent to locate the edges on the back side.)
3. Draw lines that start from the light source, touch the top of the object and continue until they intersect with the lines that define the edges of the cast shadow. Where these lines meet marks the length of the cast shadow.
4. Place the cast shadow on the ground within these lines.
The cast shadow of each object in a composition is calculated separately.
If the light source is central to a group of objects, all the cast shadows will radiate from that central point.
If you want to study in detail go through perspective drawing handbook Joseph D'amelio even you should definitely read it if you are new in this field.
If you want to study in detail go through perspective drawing handbook Joseph D'amelio even you should definitely read it if you are new in this field.
ReplyDeleteVery Nice and informative post. look at the some of my posts here Z Shadow Types are very natural to us humans. We train deep neural networks to distinguish between types, like recognizing cats and dogs. But if you think about it, we've already "told" the neural network that types are important.