Product Representation Techniques

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Questions and Answers

Which of the following is a step in the process from mental model to a sketch?

Sketch enhancement

Select sketching medium

Define goals (correct)

Finalize the design

What is a characteristic of parallel projection in technical drawings?

Dimensions cannot be measured

Elements with equal lengths are dimensioned equally (correct)

Uses perspective to depict depth

Provides a more realistic perception

In First Angle Projection, how are the left and right sides of the object represented?

Left side is drawn on the right (correct)

Right side is drawn on the left

Both sides are drawn together in the middle

Right side is drawn on the left

Which type of projection involves imagining the backside of the object printed onto the projection plane?

Third angle projection Signup and view all the answers

What angle representation corresponds to an isometric projection?

1:1:1 Signup and view all the answers

What is the main purpose of sketches in the design process?

To convey concepts or functions Signup and view all the answers

Which statement is true about perspective projection?

It is closer to human perception Signup and view all the answers

In Dimetric projection, what is the ratio of dimensions typically represented?

1:1:1/2 Signup and view all the answers

Which of the following accurately describes Axonometric projections?

Includes a vertical edge at the front. Signup and view all the answers

Isometric projection has angles of 90° between the axes.

False Signup and view all the answers

What is the primary difference between first angle and third angle projections?

The principal view is represented in different positions relative to the object. Signup and view all the answers

In _____ projection, dimension measurements can be accurately taken from the drawing.

parallel Signup and view all the answers

Match the types of projections with their characteristics:

One Point Perspective = Single vanishing point Two Point Perspective = Two vanishing points on the horizon Dimetric Projection = A:b:c = 1:1:1/2 Trimetric Projection = A:b:c = free with varying angles Signup and view all the answers

What is a primary goal when creating a sketch?

To communicate the concept effectively to the target audience. Signup and view all the answers

Perspective Projection allows elements of equal length to be displayed with different dimensions.

True Signup and view all the answers

What does the term 'sketch' usually refer to in product design?

A preliminary visual representation of an idea or concept. Signup and view all the answers

Study Notes

Product Representations

Different ways to represent a product include sketches, 3D models, technical drawings, and photorealistic renderings.

Mental Model to Sketch Process

Creating a product representation starts with a mental model.
Steps include: defining goals, forming a mental representation, choosing the representation method, sketching, and validating.

Sketch Goals

Sketches should clearly show the product's intended aspects.
Consider the target audience when creating a sketch.
Sketches can be for various purposes: concept, function, design, or support.

Projection Taxonomy

Perspective Projection: Uses a view center, projection plane, and projectors.
- One-point perspective
- Two-point perspective
- Used in photorealistic rendering (e.g., architecture design).
Parallel Projection: Uses a view direction, projection plane, and parallel projectors.
- Technical drawings often use parallel projection.
- Dimensions are measurable on the drawing.
- Elements with equal length have equal dimensions on the drawing, unlike perspective projections.
- Closer to eye perception
Orthogonal Projection: A type of parallel projection.
- Further categorized as First Angle Projection and Third Angle Projection.

First Angle Projection

Imagine viewing the object through the projection plane.
Principal view is in the middle.
Left of the principal view shows the object's right side, right of the principal view shows the object's left side (similarly for top and bottom views).

Third Angle Projection

Imagine printing the object's backside onto the projection plane.
Principal view is in the middle.
Left of the principal view shows the actual left side of the object and right of the principal view shows the actual right side (similarly for top and bottom views).

Axonometric Projections

Axonometric projections: have a vertical edge at the front.

Isometric Projection

Isometric projection: ratio of all axes (a:b:c) = 1:1:1
Angles (alpha & beta) = 30 degrees

Dimetric Projection

Dimetric projection: (a:b:c) ratio = 1:1:0.5
Angles (alpha & beta) are specific values (42° and 7° respectively).

Trimetric Projection

Trimetric projection: (a:b:c) ratio is not fixed.
Angles (alpha & beta) vary between 30° and 45°.

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Description

Explore different methods of representing products, from sketches to 3D models. This quiz covers the mental model to sketch process, including sketch goals and projection taxonomies such as perspective and parallel projections. Understand how to effectively communicate product designs.