A starting method for novice sketching a gypsum body cone
We want to draw the shape of the gypsum cone, and it is indispensable that we have to start according to the shape of the circle, and to draw a circle we have learned before, using a little perspective cube. Let's take a look at how to draw the shape of the gypsum cone.
Generally, we need to go through three steps to draw the shape of the gypsum body cone.
1. Draw a square with a little perspective, mark the center point through the diagonal crossing we learned before, and then make auxiliary lines such as horizontal lines parallel to the upper and lower sides of the point perspective and vertical lines parallel to the left and right sides through the center point.
2. Draw a perspective circle using the method you learned before, and the perspective circle is the bottom of the cone. The point of the center of the circle is vertically formed upwards, and a point is taken in the corresponding position as the highest point of the cone (that is, the tip of the cone), connecting the point representing the tip of the cone and the two endpoints to the left and right of the perspective circle. The shape of the cone is probably painted,
3. At the same time, according to the structural characteristics of the cone, we can observe and analyze the structure of this cone, in order to highlight its three-dimensional sense and sense of space. You can draw several main structural lines, and pay attention to the difference between virtual and solid, strong and weak in the use of lines before and after the body.
Chiaroscuro for novice sketch columns
On the basis of the shape of the cylinder in front, we continue to begin to understand and master the light and shade of the cylinder.
If we first look at the cylinder as a six-sided prismatic shape, then its light and dark transition is very simple and very accurate. Under the light of a generally fixed light source, one of the prisms of the cylinder is in the dark part of the backlight, and the other faces are bright. The brightness of the different steering surfaces of the bright part is different; the dark part also has a reflective edge, which contains the basic elements of the five tones of the cube. (Find the light source, from light to dark, little by little). Cylinders also have these basic tones, but their changes are more subtle and delicate, and the layers are more rich and varied. It is worth noting that in all the changes in light and shade of the cylinder, the shape of each lightness should be the same width of the upper and lower parts, that is, the upper and lower parts should be the same, and there should be no arbitrary smearing, arbitrary changes, especially to the center of the light and dark junction, evenly unfolding to the dark and bright parts. The shape of the chiaroscuro line should be a change in perspective around the cylinder. There must be no ambiguity, no arbitrariness. The chiaroscuro line is also depicted with emphasis!
A starter drawing method of sketching a cylinder
It is not difficult to imagine that the cylinder is made of countless circles from top to bottom, so the rise of the cylinder can be connected by the upper and lower three same perspective circles up and down, (vertical standing cylinder). There are vertically standing cylinders with fallen cylinders, and the fallen cylinders will change with the edge perspective of the auxiliary perspective squares of the three fluoroscopic circles, that is, the whole is smaller and smaller as it goes backwards, and there is a tendency to shrink backwards.
Due to the vertical overlap of the circular planes. Therefore, from a certain direction, the vanishing line of the top surface and the vanishing line of the bottom surface intersect the extinction point of the horizon, resulting in the difference between the area perspective reduction of the bottom surface and the top surface. It is worth noting that the round bottom of the plaster cylinder and the corner where the (top surface) turns backwards, it is easy to be mistaken for a right angle turn, so that it cannot be seen that it is actually a circular extension of the long semicircular face in front to the semicircle in the back, and is also a circular edge of the important depth of circular perspective. Please pay attention to it.
Chiaroscuro treatment method for novice sketch plaster circles
After we have typed the shape of the plaster circle, we are going to start dealing with the relationship between light and dark of the circle. First of all, the first step we have to do is to carefully observe the relationship between light and shade of the plaster circle, including light source, bright side, gray side, light and dark boundary, dark side, reflection in dark side, projection and so on. Let's take you to understand the characteristics of these points.
The light source, as the name suggests, is the source, the direction of the light.
The bright side, where the light shines directly, is the brightest area in the entire plaster sphere.
Gray, the area where the light is obliquely struck, is grayish white and second only to the bright side in brightness.
The junction line of light and shade, the area where the bright side and the dark side meet, should be the contrast between light and dark strongly dark black is the darkest area of the gypsum body, and the three-dimensional effect of the entire gypsum body depends on the processing of the chiaroscuro junction, so the chiaroscuro junction is the focus of the entire picture, and it is necessary to focus on depiction and pay attention.
The dark side is the place below the junction of light and darkness, where the light cannot be illuminated.
Reflective, slightly brighter and darker areas formed by the influence of ambient light and natural light.
Projection, the projection of the circle is an ellipse, characterized by near real and far virtual, requiring gradient processing.
A starting method for novice sketching plaster circles
The drawing method of the circle in the sketch is different from the drawing method of the plaster cube and has been extended, and the perspective drawing method of the circle needs to be assisted by the perspective law of the square, so as to draw the perspective of the circle.
Let's take a look at the drawing method of circular perspective: first we draw a perspective shape of a cube, draw two diagonal lines on its front, and then draw four points where two diagonal lines intersect, a total of eight points, and connect the eight points in turn with curves to form circles. And at the same time, we should pay attention to the circular perspective from our near half circle to be slightly larger, the far half circle to be slightly smaller, when drawing the arc, pay attention to uniformity and naturalness, and the two ends can not be drawn too sharp or too round. After the general perspective is released, it is necessary to adjust the edge line of the circle as a whole, and try to be uniform, smooth and natural. After determining the perspective of the circle, we can erase some of the original auxiliary lines with an eraser. Just leave the shape of the circle we need to prepare for the next chiaroscuro relationship...