1. REPRESENTATION
SYSTEMS

2. WHEN WE WANT TO MAKE A
DRAWING OR PAINTING WE
USUALLY WANT TO
REPRESENT THE THREE
DIMENSIONS OF THE REALITY
ON THE TWO DIMENSIONS OF
THE SURFACE WE ARE
WORKING ON.

3. HOW TO DO IT?

4. WE CAN MAKE A DIFFERENCE BETWEEN
SUBJECTIVE WORKS
OBJECTIVE WORKS

5. IF WE ARE TALKING
ABOUT SUBJECTIVE
WORKS (PAINTINGS,
DRAWINGS...)

6. WE USE DIFFERENT MEANS
representation systems - 3º ESO
montserrat llamas blanco
we use different means
size
overlapping
atmospheric perspective
linear perspective
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7. AND IF WE TALK ABOUT
OBJECTIVE
WORKS(TECHNICAL
DRAWINGS, DESIGNS...)

8. WE USE WHAT IS CALLED
"REPRESENTATION
SYSTEMS"

9. LET'S HAVE A LOOK AT THREE OF
THEM:
representation systems - 3º ESO
montserrat llamas blanco
1. the orthographic system
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10. LET'S HAVE A LOOK AT THREE OF
THEM:
representation systems - 3º ESO
montserrat llamas blanco
2. the axonometric system
17

11. LET'S HAVE A LOOK AT THREE OF
THEM:
representation systems - 3º ESO
montserrat llamas blanco
3. the linear system
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12. ALL OF THE SYSTEMS ARE BASED
ON A CONCEPT CALLED
"PROJECTION"

13. IT IS EASY TO UNDERSTAND THE CONCEPT USING A
SOURCE OF LIGHT, AN OBJECT AND THE SHADOW IT
PROJECTS ON THE GROUND
representation systems - 3º ESO
montserrat llamas blanco
light = centre of projection
rays of light = projection rays
object
shadow = projection
ground = projection plane
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14. THERE ARE THREE DIFFERENT KINDS OF
PROJECTION DEPENDING ON HOW THE CENTRE OF
PROJECTION AND THE PROJECTION RAYS ARE:
linear projection orthogonal cylindrical oblique cylindrical
projection projection
cylincrical projections

15. EACH REPRESENTATION
SYSTEM IS BASED ON ONE
OF THE PROJECTIONS. IT IS
WHAT MAKES THEM
DIFFERENT.
LET'S SEE IT:

16. representation systems - 3º ESO
montserrat llamas blanco
orthogonal cylidrical all the rays are
projection: parallel to each
other and
B
perpendicular to
A the picture plane
C
B'
∝
A'
orthogonal system
C'
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17. representation systems - 3º ESO
montserrat llamas blanco
oblique cylidrical
projection: all the rays are
parallel to each
B other and oblique
to the picture plane
A
C
B'
∝
A'
axonometric,
C' caballera and military
perspective
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18. representation systems - 3º ESO
montserrat llamas blanco
linear projection:
all the rays come
o from a point called
the
centre of projection
B
A
C
B'
∝
A'
linear perspective
C'
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19. IN THE NEXT CHART
YOU CAN SEE WHICH
REPRESENTION
SYSTEM COME FROM
EACH PROJECTION

20. representation systems - 3º ESO
montserrat llamas blanco
projections representation systems
cylindrical orthogonal orthographic system
axonometric system
cylindrical oblique
caballera perspective
military perspective
one-point linear system
linear
two-point linear system
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