In "product design", what is the importance of hand-drawn images? What is the fundamental difference between it and computer drawing?

For designers, there are two kinds of hand-drawing: one is the hand-drawing by designers to express their design concepts, and this kind of hand-drawing does not exist whether the painting is good or not, only whether it can be clearly expressed so that others can understand it; This kind of hand-drawing ability is what every designer should have; The other is hand-drawn drawings, such as hand-drawn plans and perspective views. These are like computer renderings, and it is not necessary for everyone to draw them. Hand-drawing in this respect is far less timely than computer renderings.

1 Hand-drawing starts from inspiration, and can be copied properly in the early stage of practice, and we must insist on expressing design inspiration to start the practice. Therefore, we must take improving our professional theoretical knowledge and cultural and artistic accomplishment, and cultivating creative thinking ability and profound understanding ability as an important training purpose throughout our study.

2 practice regularly. The so-called training for a thousand days, fighting for a while. I believe that long-term unremitting practice will definitely make what you write hearty and thoroughly show the design intention to everyone.

3 the product is rigorous. Grasp the position, size, proportion, perspective, color matching and scene atmosphere of the product scientifically in the exercise. Therefore, we must master the law of perspective and apply it to deal with all kinds of images, so that the physical structure of the picture is accurate, true, rigorous and stable.

4 In addition to being familiar with and applying the perspective rule, you must also learn to treat the internal composition of each form and the spatial relationship between each form with the method of structural analysis. Learning the method of structural analysis of forms depends on structure sketch's training. 5 composition layout. Composition is an indispensable initial performance stage at the beginning of any painting, and product design performance drawing is no exception. The so-called composition is to organically combine many formative elements in the picture, and reasonably arrange them in the appropriate position in the picture according to the theme required by the design, so as to form a picture that is both opposite and unified, so as to achieve a visual and psychological balance.

The fundamental difference from computer drawing is that the hand-drawn board is more flexible! Superior to the computer!