How to Draw: Drawing and Sketching Objects and Environments from Your Imagination
How to Render: The Fundamentals of Light, Shadow and Reflectivity
1.Perspective Grid Skills
Before proceeding with the exercises in this chopter, it is
absolutely necessary to be proficient in creating perspective
grids, including drawing toward Vanishing Points that are off
the page, as well as being familiar with Auxiliary Vanishing
Points. Mastery of these skills ensures that you are always in
control of the scene being drawn, knowing where all points are
relative to one another in perspective.
Creating X-Y-Z volume constructions helps to understand and
communicate a design, and plan for shadow construction . It
enables the addition of details to the rendered shape, such as
cut lines or other elements. One must have the skills to create
these types of constructions for advanced form renderings, since
it will be necessary to move back and forth fluidly between
plotting construction lines and developing a design with value .
For many of the upcoming shadow-casting constructions, the
skills to transfer height points, in perspective, is needed. When
objects are under a light source, transferring their height to a
vertical line creates what is called a Shadow Origin (A, B).
There are multiple ways of doing this, all of which rely on
strong perspective construction skills.
4.Section Drawing Skills
Most constructions require drawing a line on the ground,
through the object, in the direction of the cast shadow (A),
and then constructing a vertical plane from this line, that cuts
through the object (B) .
It is important to know how to create section lines, which can
range from rectangular sections over complex planar forms, to
curved sections over X-Y-Z forms.