Selasa, 18 September 2012

Horizon / The Eye in Perspective Drawing

Horizon Eye Level is the level of the horizon / eye is the axis around which a perspective built.
When we are outdoors we use the horizon as a reference point for assessing the scale and distance of objects in relation to us.
In a perspective drawing, the horizon will be the viewers eye-level.
In art, we tend to use 'eye level' terms, rather than the 'horizon' as in many images, the horizon is often hidden by walls, buildings, trees, hills etc.
To create perspective drawings above, we have added a few tourists to our location from page 1.
Notice how all four share the same eye level numbers - .. That horizon this picture shows that they are all the same height and stands on the same plane horizon Because we happen to be at eye level, it was also demonstrated that the same height as the image viewer. As a result, organizational scale and distance in a good visual image makes sense.
If you mouse over this image to express the image of our second. Although these numbers are still the same size, at eye level they no longer have a relationship with the level of eye images. As a result, the scale numbers are really confused.
This shows the importance of the level of the horizon / eye for organizational scale and distance in perspective drawing. It also illustrates the meaning of Leonardo's famous quote that "Perspective is to painting what the bridle horse is, steering the ship ''.

One Point Perspective

One Point Perspective - Perspective Rectangle
In our perspective drawing above, you can see the construction lines used to draw two rectangles from our illustration on page 2.
There are two types of construction lines used in perspective drawing:
1) Orthogonal lines we have drawn in red.
2) Latitude which we have drawn in green.
We will continue to use color codes in the following illustration.
Orthogonal Lines
The line orthogonal and parallel to the ground plane moves back from the picture plane.
The line orthogonal set height or width varies from a rectangular plane as it receded from view.
The line orthogonal to always appear to meet at a vanishing point at eye level.
The line transversal
The lines are always transversal right angl es to orthogonals.
A line parallel to the transverse images and each other.
Lines formed transverse fixed height or width between two orthogonal lines.
Lines forming transverse edges near and far ends of a rectangle as receding from view.

Vanishing Point
Vanishing point, which we have drawn in blue, is the point at eye-level where parallel lines appear to be merging and disappearing two illustrations on this page using a single vanishing point and shows the simplest form of perspective drawing:. One Point Perspective.

One Point Perspective - Perspective Box
One point perspective is so called because it uses a single vanishing point for drawing objects. This is the simplest form of image perspective and is used here to draw a box.
In one point perspective, front and rear transverse plane box always remains parallel to the image plane. Only the scale changes as they recede into the distance.
Note that only the receding orthogonal lines that change their angle.
If you mouse over the image to see the illustration is complete, you will see that the front and back of our plane had left a box filled to make construction more terlihat.2Dua Point Perspective
2. Two Point Perspective

Two point perspective is used in this illustration to draw our box which has now been rotated at an angle to the plane of the image.
Two point perspective using two sets of orthogonal lines and two vanishing points to draw each object.
No more plane parallel to the image plane. However, vertical transversal lines are drawn parallel to each other and at right angles to the ground plane.
It is at this stage that a perspective from a more awkward because the two vanishing points are located well outside the picture frame.
Click here to see an illustration showing the position of the second vanishing point. If the two vanishing points located within the frame, the angle that the objects appear to be very narrow.
In the illustration is completed, you can see when you mouse over the image, the front and back of the box we had left the aircraft filled to make construction more visible.

3. Three Point Perspective


Three Point Perspective uses Eye Level Low. Three Point Perspective of the most complex form of perspective drawing. Three point perspective uses three sets of orthogonal lines and three vanishing points to draw each object.
Click here to see the full illustration displayed with all missing the point.
This technique is most often used when drawing buildings viewed from eye level or high-low. Eye level is low in our illustration above creates the illusion that the shape of the box is looming over us. Naturally given the scale of the buildings.
In one and two point perspective, the image plane remains at right angles to the ground plane. In three point perspective, the picture plane seems to be set at an angle as viewers tend to tilt their head back or forward to see up or down from eye level.
As a result, vertical transversal lines, which are parallel in one and two point perspective, now seem to recede. They form a set of three orthogonal lines, which rise from the ground plane and eventually meet at a point vanished 3, high above the image plane.
Three Point Perspective uses the High Level Eye
Three-point perspective is also used when drawing objects from high eye level as in our illustration above. It creates the illusion of looking down from a high angle.
The process of drawing is just the opposite of the method used to draw a box from a low eye level.
4. Perspective Circle
The Perspective Drawing Circles
A circle in perspective is called an ellipse. Picture of the ellipse is controlled by rectangular perspective.
Our picture above ellipse illustrates this technique. There are two distinct phases in the creation of:
Figure 1 The first circle visualized in the form of a flat square on a grid plan. Each section of the grid contains a quarter circle.
Fig.2 distorted square grid in accordance with the laws of perspective. The circle is then drawn back into the grid distorted to create an ellipse.
The diagonals of the grid has been drawn on the second illustration to assist with planning circles and ellipses.
Mouse over the image to see an illustration completed without construction lines.
5. Perspectives of Cylinder
The Perspective Drawing of Cylinder
Before you learn the cylindrical perspective, it helps if you understand the perspective of the circle described on the previous page.
A cylinder is a circle that is projected into three dimensions.

Figure 1
This is an illustration of a circular cylinder formed by the projected vertically from the ground plane. Ellipse outlining all cylinders of the same width. However, they rounded the curve gradually increases as they rise above or fall below eye level. Notice how the ellipse at eye level is seen as a straight line.
Figure 2
This is an illustration of a circular cylinder formed by the horizontal projected from the image plane. Circular curves that make up the cylinder all the same shape, but they reduce the scale as they retreated from the image plane to vanishing point.
The two examples we used one point perspective, the simplest form of perspective drawing.
Perspectives in Article 1
Perspective Drawing uses Eye Level Center
If you can see or if you know the position of the horizon in the image, the image automatically becomes an extension of your own personal space.
Because the horizon is also at eye level, you can understand the scale and space of the image in relation to your own body. Every part of the image corresponding to the level of the eye, feeling as if close to your own personal altitude effect works if the objects are small or large, near or far, or whether the viewer is standing, sitting or lying down ..
Wherever you choose to place at eye level in the image will have a significant effect on the composition.

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