Your SlideShare is downloading. ×
0
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

# Lesson 2 graphic e magnitudes

145

Published on

Learn basic issues about graphic expression

Learn basic issues about graphic expression

Published in: Education, Technology
0 Comments
1 Like
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Be the first to comment

No Downloads
Views
Total Views
145
On Slideshare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
3
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

### Transcript

• 1. GRAPHIC EXPRESSION Lesson 2. 1st term
• 2. Perspective in drawings &#x2022; We use projection drawings to represent 3D objects in two dimensions (our paper) &#x2022; There are two types of projections: Cylindrical (Orthogonal) Conic &#x2022;No distorsion &#x2022;Vanishing point (VP) far away &#x2022;Objects are distorted in the same way our eyes see them &#x2022;Vanishing point close (x, y, z) VP VP
• 3. First angle projection &#x2022; Cylindrical projection composed of three views (taken from very far away) of the object: front side top
• 4. First angle projection: result front top side
• 5. Oblique projection &#x2022; We represent one of the faces (mathing with X and Y axis) in true dimension and the others are distorted. Y Z X
• 6. Representing objects in oblique projection We have to consider the X, Y and Z axis. We first draw the front face of the figure (X and Y axis Then we draw the sides corresponding with the z axis with a reduction coefficient of 1/2 We finally close the figure with the lines corresponding to the back of the figure Y Z X
• 7. Axonometric projection _ Isometric projection &#x2022; Axonometric projection shows an object from the corner so we see its three sides &#x2022; Objects seem distorted because the same scale is used for all features &#x2022; One axis is drawn vertical and the others are at an angle. 120&#xBA; 120&#xBA; 120&#xBA; Isometric projection
• 8. Drawing objects in isometric projection We draw according the axis at 120&#xBA; angles We first draw a figure&#x2019;s corner 120&#xBA; 120&#xBA; 120&#xBA; Second we draw the lines which correspond to the sides next to the corner, corresponding with Z axis Then we draw the lines corresponding to the left and rigth corners We first draw a figure&#x2019;s corner Isometric projection
• 9. Two point perspective &#xF076;Draw an horizontal line across the page and mark two vanishing points: VP1 and VP2 &#xF076; Draw one corner of the box: vertical line &#xF076;Draw the construction lines from the top and the botton of the corner to the vanishing point &#xF076; Draw two vertical lines corresponding to the left and rigth corners. They go from the top to the botton lines &#xF076;Draw the last construction lines from the top and the botton of the other corners &#xF076;Complete the box using the construction lines VP1 VP 2
• 10. Single point perspective &#xF076;First draw the front of the cube. Then add a vanishing point (X) &#xF076;Draw thin construction lines from each corner to the vanishing point &#xF076;Draw the lines which correspond to the back of the figure &#xF076;Draw the rest of the figure over the segments of the construction lines VP
• 11. Dimensioning &#x2022; To dimension means &#x201C;to indicate the real size of an object in its drawing&#x201D; 70 25 50 45
• 12. Scale &#x2022; Scale is a quotient/relationship beetween the size of an object&#x2019;s drawing and the real size of this object. Scale=Drawing size/real size: 1:n or n:1 It is written as entire number, one of it is 1. Amplification scale: 2:1 (n:1) Reduction scale: 1:2 Real scale: 1:1
• 13. Magnitudes and units &#x2022; Magnitude is a physical property which we can measure / determine / quantify: i.e: length, mass,&#x2026; &#x2022; Units are the symbols which go after a number and identify the magnitude we refer to
• 14. Types of magnitudes &#x2022; Fundamental: we can express or determine them with a direct measurement: there are seven: mass (M), length (L), time (t) &#x2022; Derived (derivadas): they are obtained by combining the fundamental magnitudes: force, volume, surface&#x2026;
• 15. Metric system &#x2022; A metric system is a unit system where bigger and smaller quantities are easier to convert. In a metric system, units of the same magnitude are transformed into powers of 10. 106 1000 100 mega kilo M K 10 0.1 0.01 0.001 10-6 hecto dam deci centi mili micro H d c m &#xB5; D 1
• 16. The international system (S.I.) &#x2022; It is a metric system where units are Type Funda- magnitude Unit Length Meter (m) Mass Kilogram (kg) mental Time Second (s) Temperature Kelvin (K) Derived Force Newton (N=kgm/s2 Energy Joule (J=Kgm2/s2 Power Watt (J/s)
• 17. Conversion coefficients &#x2022; For different reasons, magnitudes can be expressed into different units. To convert those units we multiply them by conversion coefficients: They are quotients where we write the units we want to convert and their mathematical relationship. i.e 52km 1000 1 m Km 52000 m 1. We identify how many different magnitudes we have: 1 (length) and add the same number of coeff. (1) 2. We write the former unit in the denominator and the new as the numerator 3. Before the unit, we add a &#x201C;1&#x201D; before the bigger unit and before the smaller, the number of smaller units contained in the bigger . 4. We simplify and multiply, obtaining the result