1. A quick way to get an Idea on a sheet of paper
2. Usually small but drawn in proportion
3. The relation ship of heigh to width should be show in the thumbnail sketch.
4. Use pencil lightly and darken in final stage of drawing
5. Thumbnail sketch must be as detailed as necessary to convey your idea.
1. Perspective drawings are pictorial representations of objects because they look like a photograph
2. Perspective drawings appear as the eye sees the object.
3. A photograph is a perspective
In a one-point perspective, an object is situated with one face parallel to the plane of projection.
Only one vanishing point is required.
2 - point perspective
With 2-point perspective the object is situated at an angle with the picture plane, but with vertical edges parallel to the picture plane.
2 vanishing points are required due to the turning of the object from the picture plane.
The result is a 2-point perspective.
This is the most common type of perspective drawing
1. Commonly referred to as multi-view drawing
2. A photograph or perspective drawing shows an object as it appears to the observer, but not as it truly is, and dosn't describe the object fully or show TSS ( True Size and Shape).
3. Orthographic drawing shows true size and shape.
4. Is needed in industry to give a complete and accurate description of the size and shape of an object to be manufactured.
5. A number of views must be systematically arranged so that anyone in the world can understand.
6. Use Universal Language Drawing practices to describe an object accuratly and clearly which = orthographic drawing
Human Viewing vs Orthographic Drawing
1. Humans see width, height, and depth all at once, like a perspective drawing.
2. With an orthographic drawing, you look at the object in 3 different ways (front view - height and width ; top view - width and depth; right side view - hight and depth)
Order of orthographic drawing
In top left corner is top view.
Below top view is front view.
To the right is front view is right side view
An isometric drawing is often used for quick sketching to explain an idea quickly.
It does not show how we actually see an object.
Object are drawn at an angle so you see 3 sides at once.
All parallel lines are drawn in parallel with no vanishing points so lengths do not diminish in the distance.
Diagonal lines representing horizontal edges are drawn 30 degrees from a horizontal base line.
What is the purpose of sketching?
Think through a design,
communicate your ideas to others,
use lines and symbols to describe a design
What are some common uses of sketching?
What are the advantages of sketching?
Why is important that you learn how to sketch?
It helps you think about your idea and draw them. Communication.
Why is it important to use the proper line types?
Each line is used for different things. Communication.
What factors should you consider when deciding which side of an object is the front?
Best shape and details.
Fewest hidden lines.
Most natural position.
What is mean by precedence of lines?
Object lines exist over hidden and center lines.
Hidden lines exist over center lines.