First of all, we should use perspective to express the structure of the object, build a spatial framework, then use artistic methods to express light and shade, color and texture, and finally complete the spatial representation diagram, thus reflecting the designer's intention. In the process of painting modeling, the focus is on the performance of perspective. It is not enough to express the three-dimensional effect with a single line. In order to strengthen the three-dimensional sense, we must use the relationship between light and shade. In hand-drawn expression, the application of three aspects and five tones in sketch can be summarized and simplified according to the needs of design effect.
In the actual design performance, you should choose complex and universal expressions according to the different uses of the renderings, so as to express your design ideas more clearly.
2. Color is an important means to embody the design concept and enrich the picture.
The colors of general renderings should be concise, general and vivid, so as to reduce the complexity of colors. In order to enhance the artistic effect, some color renderings can be represented by colored paper as the background color. First, the colors are unified; second, the painting time is saved; third, the colors can be well unified to enhance the painting and interest.
When using color to express the effect diagram, we should not only show the relationship between color and object brightness, but also pay attention to the texture effect of different materials. According to the characteristics of different surface materials, the corresponding pen lifting methods should be adopted. If the surface texture is not obvious, you can keep the direction of the pen consistent, and the colored pen should have speed. Clean and neat, the dark parts can be drawn with changing strokes, and the colors are cold and warm.
3. Texture is the feeling of different object characteristics in vision or touch.
In art, grasping the realism of different objects in different ways is called texture. The expression method of texture plays a great role in indoor hand painting. The purpose of learning expression techniques is to make the renderings of design results more realistic and convincing. The natural characteristics of different substances are called natural textures, such as air, water, rocks, bamboo, etc. The expression after artificial treatment is called artificial texture, such as brick, ceramic, glass, cloth, plastic and so on. Different textures give people a variety of feelings such as softness, truthfulness, smoothness, tenacity, transparency and turbidity.
(1) shows metallic texture. The transition between light and shade is soft, and the contrast is strong under the irradiation of light. When expressing the surface with strong glossiness, we should pay attention to the treatment of highlights, reflections and reflections. The brush strokes should be parallel and neat, which can be expressed with a ruler.
(2) Expressed the texture of transparent materials. Glass (colored and colorless) should master the polygonal relationship between reflected part and transmitted light. Transparent materials are basically expressed by the background color of the environment and the color of light irradiation.
(3) wood grain. Mainly the performance of wood grain, according to the variety of wood. First paint a layer of wood background color, and then draw wood grain lines by hand. Wood grain lines are shallow first and then deep, which makes wood grain naturally smooth.
(4) the performance of stone texture. Stones are widely used indoors. Its texture is hard, smooth and bright. When displaying, we should paint a thin layer of background color according to the inherent color of the stone, leaving high light and reflection, and then draw the texture of the stone appropriately with Gou Xianbi.
(5) Expression of leather and plastic texture. Leather and plastic surfaces are smooth and non-reflective, between glass and wood. They are not as bright as glass, but they are very shiny compared with wood. The transition between light and shade should be slow, and the coloring should be natural and even.
4, design ideas and composition layout Correctly grasp the design concept and conception, and deeply understand the design intention is the primary focus of learning performance drawing techniques. Therefore, we must improve our professional theoretical knowledge and cultural and artistic accomplishment, and cultivate creative thinking ability and profound understanding ability as an important training purpose throughout our study. ? Composition is an indispensable initial performance stage in any painting, and decorative design performance diagram is no exception. The so-called composition is to organically combine many modeling elements on the screen, arrange them in appropriate positions in the screen according to the theme required by the design, and form a picture of unity of opposites, so as to achieve a visual and psychological balance.