Sketching method for gypsum body cone
We have to draw the shape of the gypsum body cone. It is essential that we start with the shape of the circle. We have to learn the circle before we have used it. We use a square cube. Let's take a look at how to draw the shape of the gypsum cone.
In general, we need to go through three steps to draw the shape of the gypsum cone.
1. Draw a square with a little perspective, mark the center point through the diagonal crossing that we have learned before, and then make the auxiliary line such as the horizontal line parallel to the upper and lower sides and the vertical line parallel to the left and right sides through the center point.
2. Draw a perspective circle using the method you have learned before, and the circle of this perspective is the bottom of the cone. Make a vertical line up through the center point, take a point at the corresponding position as the highest point of the cone (that is the tip of the cone), and connect the point representing the tip of the cone to the two ends of the perspective circle. The shape of the cone is probably drawn.
3. At the same time, according to the structural characteristics of the cone, we can observe and analyze the structure of the cone in order to highlight its three-dimensional and spatial sense. You can draw a few major structural lines, pay attention to the difference between the front and back of the body in the use of lines, the strength and weakness.
Sketch cylinder
On the basis of the shape of the cylinder in front, we continue to understand and master the light and darkness of the cylinder.
If we first consider the cylinder as a six-sided prism, then its light and dark transition is very simple and very precise. Under the light of a generally fixed light source, one of the facets of the cylinder is in the dark part of the backlight, and the other side is the bright part. The brightness of the different turning surfaces of the Ming Dynasty is different; the dark part also has the reflective facet, which contains the basic elements of the five-tone cube. (Find the light source, once from bright to dark, look for it little by little). The cylinders also have these basic tones, but their changes are more subtle and delicate, and the layers are more varied and varied. What deserves our attention is that in all the light and dark changes of the cylinder, the shape of each brightness should be the same as the upper and lower widths, that is, the upper and lower sides should be the same, and there should be no random smearing, random changes, especially It is necessary to spread the dark and the bright part evenly around the boundary between the dark and the light. The shape of the light-dark boundary line should vary around the perspective of the cylinder. There must be no ambiguity, any randomness. The border between light and dark is also marked with emphasis!
The shape of the cylinder is somewhat similar to the shape of the circle. It is not difficult to imagine that the cylinder is superimposed by countless circles from top to bottom, so the shape of the cylinder can be up and down through the upper and lower sides. Connected, (column standing upright). A cylinder that stands upright has a fallen down cylinder, and the fallen cylinder has a change in the sideline perspective of the auxiliary perspective square of the three formed perspective circles, that is, the smaller the whole is, the smaller it is, the more it shrinks backwards. trend.
Due to the vertical overlap of the circular planes. Therefore, when viewed from a certain direction, the vanishing line of the top surface and the vanishing line of the bottom surface intersect at the elimination point of the horizon, resulting in a difference in the reduction of the area of the bottom surface and the top surface. It is worth noting that the round bottom and the top surface of the gypsum cylinder are turned back to the corner, which is easily mistaken for a right-angled turn, so that it is not the front semi-circular surface to the rear semi-circular surface. The circular extension is also the circular edge of the important depth of the circular perspective. Please be sure to pay attention to it.
Shading Sphere Method
After we have cast a gypsum round shape, we will start to deal with the round and dark relationship. First of all, our first step is to observe carefully and observe the relationship between the light and dark of the gypsum circle, including the light source, the bright surface, the gray surface, the light and dark boundary line, the dark surface, the reflection in the dark surface, the projection, and so on. Let's take a look at the characteristics of these points.
The light source, as the name suggests, is the source of light, direction.
The bright side is where the light shines directly and is the brightest area in the entire gypsum sphere.
The gray surface, the area where the light is oblique, is grayish white, and the brightness is second only to the bright surface.
The boundary between light and dark, the area where the bright side meets the dark side, should be the contrast of light and dark. The dark black is the darkest part of the plaster, and the three-dimensional effect of the whole plaster depends on the treatment of the light and dark boundary, so the boundary between light and dark The line is the focus of the whole picture, and it needs to be focused on and focused.
The dark side is the place below the light and dark boundary line, where the light is not available.
Reflective, a slightly brighter and darker area formed by ambient light and natural light.
Projection, the projection of the circle is elliptical, characterized by near real and far imaginary, requiring a gradual processing.
The drawing in the circle of the sketch is different from the drawing of the plaster cube, and the circular perspective painting needs to be assisted by the perspective law of the square to draw a perspective of the circle.
Let's take a look at the circular perspective: first we draw a perspective of the cube, draw two diagonal lines on the front, and then draw two points intersecting the two diagonal lines. Eight points, the eight points are sequentially connected by a curve into a circle. At the same time, it should be noted that the circular perspective is slightly larger than the half circle closest to us. The far half circle should be slightly smaller. When drawing the arc, pay attention to the uniform nature, and the two ends should not be too sharp or too circle. 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 light and dark relationship. . .
Cre: KKnews
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