Wednesday, 16 December 2015

Cycloids And Their Construction

What is a Cycloid?
  • A cycloid is a curve generated by a point on the circumference of the circle as the circle rolls along a straight line with out slipping..
  • The moving circle is called the "Generating circle" and the straight line is called the "Directing line" or the "Base line".
  • The point on the Generating circle which generates the curve is called the "Generating point"


Construction of a Cycloid
  • Step1: Draw the generating circle and the base line equal to the circumference of the generating circle

  • Step 2 : Divide the circle and the base line in to equal number of parts. also erect the perpendicular lines from the division of the line

  • Step 3: with your compass set to the radius of the circle and centers as C1,C2,C3,.... etc cut the arcs on the lines from circle through 1,2,3, .. etc.
  • Step 4: locate the points which are produced by cutting arcs and joining by a smooth curve.
  • By joining these new points you will have created the locus of the point P for the circle as it rotates along the straight line with out slipping

  • As our final result is a cycloid

Epicycloids And Their Construction

EPICYCLOIDS
What is Epicycloid?
  • The cycloid is called the epicycloid when the generating circle rolls along another circle outside(directing circle)

  • The curve traced by a point on a circle which rolls on the out side of a circular base surface

CONSTRUCTION OF EPICYCLOID
  • Step1: Draw and divide the circle in to 12 equal divisions.
  • Step 2: Transfer the 12 divisions on to the base surface.
  • step3: Mark the 12 positions of the circle- centers (C1,C2,C3,C4..) as the circle rolls on the base surface.
  • Step 4: Project the positions of the point from the circle.
  • Step 5: Using the radius of the circle and from the marked centers C1,C2,C3,C4.. etc cut off the arcs through 1,2,3.. etc
  • Step 6: Darken the curve

Hypocycloids And Their Construction

HYPOCYCLOIDS
construction of hypocycloid
  • The curve traced by a point on a circle which rolls on the inside of a circular base surface.

  • Step 1: Divide the rolling circle in to 12 equal divisions.
  • Step 2: Transfer the 12 divisions on to the base surface.


  • Step 3: Mark the 12 positions of the circle - center (C1,C2,C3..) as the circle rolls on the base surface.
  • Step 4: project the positions of the point from the circle.
  • Step 5: Using the radius of the circle and from the marked centers step off the position of the point.
  • Step 6: Darken the curve.

Conic Section

CONIC SECTION


CONIC SECTION mainly consists of three major parts they are
Ellipse
Parabola
Hyperbola

Conic sections are the intersections of a right regular cone, by a cutting plane in different positions, relative to the axis of the cone.

PARABOLA
The parabola  is a conic section, the intersection of a right circular conical surface and a plane to a generating straight line of that surface. Given a point (the focus) and a corresponding line (the directrix) on the plane, the locus of points in that plane that are equidistant from them is a parabola.

CONSTRUCTION 


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ELLIPSE
an ellipse is a plane curve that results from the intersection of a cone by a plane in a way that produces a closed curve. Circles are special cases of ellipses, obtained when the cutting plane is perpendicular to the axis. An ellipse is also the locus of all points of the plane whose distances to two fixed points add to the same constant.


Ellipses are closed curves and are the bounded case of the conic sections, the curves that result from the intersection of a circular cone and a plane that does not pass through its apex; the other two (open and unbounded) cases are parabolas and hyperbolas. Ellipses can also arise as images of a circle under parallel projection and some cases of perspective projection.

HYPERBOLA
It is similar to parabola which has he eccentricity greater than 1

BASICS OF Engineering drawing

Creating a drawing
Drawing  instruments are used to draw straight lines ,circles , and curves accurately  concisely 



                   
The drawing tools are  like drawing board, mini drafter, instrument box containing compass,divider etc,.. set squares,protractor,french curves, drawing sheet,pencils,erasers..... 


DRAWING STANDARDS

  • Drawing standards are set of rules that govern how the technical drawings are represented
  • these are used so that every one can commonly understand the meaning of drawn picture
Drawing sheet
we have many types and sizes of drawing sheets..  like A4,A3,A2,A1,A0 etc




while in the drawing sheet .. first we have to draw border lines and title box and then we have to start drawing
lettering
lettering and numbering should be in a perfect manner.. for example in this figure.. the upper and lower case letters  are neatly draw


lines and its types 
basically lines which are used in the representation of the diagrams are of mainly 4 types they are
  • Visible line : represent features that can be seen in the current view
  • Dimension line ;Extension line;Leader line: indicate the sizes and location of features
  • Hidden line : represent features that can not be seenin the current view
  • Center line: represents symmetry, path of motion, centers of circles, axis of axisymmetrical parts


In this way we use different types of lines in the drawing

Engineering Drawing


ENGINEERING DRAWING

It is graphical representation of physical objects and their relationship.the ability to read drawing is the most important requirement of all technical people in engineering profession.

In the basic engineering drawing we mainly discuss about the geometrical drawing , it is the art of representation of objects on a drawing sheet and is the foundation of all engineering drawing...

IMAGINATION is very important while studying engineering drawing.

RELATIONSHIP TO ARTISTIC DRAWING

Engineering drawing and artistic drawing are both types of drawing, and either may be called simply "drawing" when the context is implicit. Engineering drawing shares some traits with artistic drawing in that both create pictures. But whereas the purpose of artistic drawing is to convey emotion or artistic sensitivity in some way (subjective impressions), the purpose of engineering drawing is to convey information (objective facts). One of the corollaries that follows from this fact is that, whereas anyone can appreciate artistic drawing (even if each viewer has his own unique appreciation), engineering drawing requires some training to understand (like any language); but there is also a high degree of objective commonality in the interpretation (also like other languages). In fact, engineering drawing has evolved into a language that is more precise and unambiguous than natural languages; in this sense it is closer to a programming language in its communication ability. Engineering drawing uses an extensive set of conventions to convey information very precisely, with very little ambiguity.
Concept Art usually represents the art in the development process of games or movies, in which will ultimately define the final look before going for final production. Therefore, concept art takes place in what the industry is calling, pre-production phase. This phase, is also the initial investment for the production, is to ensure the direction and plan is solidify before entering the next phase of investment. In any case the pre-production is deemed not projecting to where the producer or director is going, the project may be cancelled or re-evaluate.
To clear some misconception about concept art, a good piece of concept art doesn’t necessarily need to be a nice illustration. Concept art consists of two major elements, the ‘concept’ in which the idea or back-story of specific subject that might relates to the world of the story. And the ‘art’, which depicts the ‘concept’ with aesthetic design that will appeal to the production’s target audience, however still maintaining and supporting its underlying ‘concept’. Therefore, good concept art is when both ‘concept’ and ‘art’ can provide the highest entertainment value to the final production.
Skill Set in Concept Art:
These required skill set in general helps to complete a task in concept art, but the strength of each skill may vary from one artist to another and it’s what uniquely define each concept artist.
  • Concept Idea
    Communicating concept can be done literally, verbally or visually. Sometimes a rough concept will be given, and concept artists are responsible to refine and developed the concept further. This often requires an in depth understanding of the specific subject, in order to achieve believable concept to the audience. Concept artists normally should have good general knowledge of everything especially science and history, therefore artists who have great curiosity about our world can surely create good concept .e.g. A car that only levitates on water by using anti H2O (water) molecules.
    Good Concept Design - Floating TempleGood Concept Design - Goblin HutsGood Concept Design - Petrified Tree   Good Concept Design - Robed WarriorConcept art by Daniel Dociu 
  • DesignDesigns come from the artists’ visual vocabulary, and it needs to match the concept perfectly. Because lines, shapes, colors and other elements of design are able to give a certain feel and mood to the audience, concept artists need to bring out the right mood with the right elements of design, and at the same time still conveys its underlying concept. Sometimes the purpose of design can be pure aesthetic, however this kind of design usually can lack of its functionality and believability, hence may often look out of place. e.g. The design of a special radio that was invented by a scientist whom is heavily influenced by art deco in the 1920’s will have an art deco feel to it rather than the look of our modern radio.
    Good Design - Fire Element   Good Design - Robot Enforcement   Good Design - Insectoid Space Ship   Good Design - Zen RobotConcept art by Mathias Verhasselt
  • SketchingThe skill is used to visualize certain concept quickly especially in the earlier stages and where the concept is in exploration phase, concept needs to be solidified as quickly as possible before going for more refine designs to prevent the development of the project from going backwards. Which can usually be solved by increasing the quantity of concept exploration.  Concept artists could utilize any type of medium like pencil or pen drawing, marker sketches, digital speedpainting or mixed media so long as the concept can be explored and communicated in the most effective manner with the shortest or specific time frame. e.g. Enemy spaceship that comes from another galaxy could be refined to enemy massive battle fleet that comes from another galaxy with insectoid creature being the dominating species of its world.
    Good Sketch - Exo Suit   Good Sketch - Soldier   Good Sketch - Cthulhu Cave   Good Sketch - Behemoth SpaceshipConcept art by Mikko Kinnunen
  • PresentationArtist do not usually present their art like corporate people, since painting by itself should speak for itself. Also when the design can work without much explanation, it will add a lot of value to the narrative part of the production. Therefore, concept artists need to rely on their drawing and painting skills which includes the understanding of form, light, personality and other nuances, to bring the art where it can be presented, intrigue and convince the art director. Depending on the time given to the concept artists, the level of presentation varies but often more time was given for the finals as the art can be used for marketing and prints purposes. e.g. Rendering the final character, dark warlord, designed for a dark genre game in colorful and flat toon tone won’t help the directors to fit it in their mind, even if the design and concept is good. In the end, some else will be assigned to continue the development of that concept as the final.
             Good Presentation - Electric Chair RoomConcept art by John Wallin Liberto
Subsets of Concept Art:
As general, concept art consists of these subsets. Each can be a specialization because the knowledge required of each subset is too broad and can be very different from one another. Large studios generally tend to have concept artists specializing in each of these subsets, so the artists may focus and have the time to do their niche researches in order to strengthen and provide unique concept art to their targeted audience.
  • Character/Creature DesignAnatomy, fashion, culture history, personality, the animal kingdoms, habits, lifestyle… All comes in handy for a character and creature designer.
    Good Character Design - Undead Prison Guard   Good Character Design - Sea Warrior 1   Good Character Design - Sea Warrior 2   Good Character Design - Sea Warrior 3Concept art by Cole Eastburn
  • Environment DesignArtist who does the environment concept art have slightly different knowledge than the others subsets, for example culture history, weather effectsenvironment condition and its effect, general science, advanced understanding of light…Good Environment Design - Advanced Settlement   Good Environment Design - Agua Place   Good Environment Design - Cave Temple   Good Environment Design - EntranceConcept art by James Paick
  • Key ArtIllustration that conveys a specific shot or frame of the production for its lighting, mood, colors and angle. Therefore the artist has to have good illustration skills and sometimes speed, understanding of cinematography, photography, light setup, stagging and composition…Good Key Art - Solo   Good Key Art - Knightress   Good Key Art - Bike and Guns   Good Key Art - Airport SceneConcept art by Maciej Kuciara
  • Props/Vehicle DesignSometimes  complex prop and vehicle may have transformation or conversion. In order to explain the mechanical movement frame by frame for the animators to understand how it moves, the artist has to be able to visualize real mechanical function which requires some knowledge about the industrial parts. And whether the object is animate or inanimate, designing an inorganic object requires much different aesthetic sense, the artist has to study and draw substantial amount of inorganic stuffs to grasp the beauty of inorganic shapes. Industrial design in short is a close subject to this subset.Good Prop Design - CatapultGood Prop Design - Command Center Good Prop Design - ScoutConcept art by Feng Zhu