What is the difference between one-point and two-point perspective?

One-point perspective has one vanishing point, with the front face drawn flat to the viewer. Two-point perspective has two vanishing points on the horizon line, and the object is seen corner-on.

Why is perspective preferred to isometric for presenting a product to a client?

Perspective shows the product as the eye actually sees it, with receding lines converging. The drawing looks more realistic, although it cannot be measured directly.

How does moving the horizon line change a perspective drawing?

A high horizon line shows the object from above, as if looking down on it. A low horizon line makes the object look tall and imposing.

CCEA A-Level Technology and Design 8900

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Microelectronic Control SystemsOption A

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Mechanical and Pneumatic ComponentsOption B

Topic overview Open and closed loop mechanical and pneumatic control Safe working with compressed air and mechanisms Levers, linkages and moments Gear types and gear trains Pulleys, belts, chains and shaft fixings Cams, cranks and converting motion Compressed air supply and pneumatic valves Cylinders, shuttle valves, restrictors and reservoirs Pneumatic circuits for logic, timing and speed control

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Designing and Manufacturing ProductsOption C

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Designing and Manufacturing Products

Isometric, perspective and assembly drawing

3 things to know
AS 1 Paper 2

Overview

Isometric and perspective drawing, horizon lines, third angle projection and line types, BS 8888, sectional views, assembly and exploded drawings, block models and rapid prototypes.

What you need to know

Answer each one before you reveal it.

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Key term

What is a pictorial drawing?

Key term

How is an isometric drawing constructed?

Key term

Why do circles appear as ellipses in an isometric drawing?

Questions from this subtopic

Each one with the model answer underneath.

1
What is a pictorial drawing?
Model answer
A pictorial drawing shows an object in three dimensions as it would appear to the eye. Isometric, oblique and perspective drawings are all pictorial.
2
How is an isometric drawing constructed?
Model answer
Vertical edges are drawn vertical, and horizontal edges are drawn at 30° to the horizontal. All three axes use true lengths, so measurements can be taken directly.
3
Why do circles appear as ellipses in an isometric drawing?
Model answer
A circle on an isometric face is seen at an angle, so its true shape is foreshortened into an ellipse. The ellipse is constructed within an isometric square or drawn with a template.
4
What is the difference between one-point and two-point perspective?
Model answer
One-point perspective has one vanishing point, with the front face drawn flat to the viewer. Two-point perspective has two vanishing points on the horizon line, and the object is seen corner-on.
5
Why is perspective preferred to isometric for presenting a product to a client?
Model answer
Perspective shows the product as the eye actually sees it, with receding lines converging. The drawing looks more realistic, although it cannot be measured directly.
6
How does moving the horizon line change a perspective drawing?
Model answer
A high horizon line shows the object from above, as if looking down on it. A low horizon line makes the object look tall and imposing.

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