Front Face Design Of Hong Qi H7 Automobile Based On Shape Grammar

In recent years,with the rapid expansion of the automobile market,the speed of automobile shape change has been accelerated.In order to quickly occupy the market and shorten the design cycle,automobile manufacturers have gradually increased their attention to the local shape design of automobiles.Because the front face of automobiles is the most prominent position in the whole car,it has become the most important design area of this kind of local shape design.Traditional automobile front face modeling design is mainly based on feedback from market and consumers,Designers' design experience,automobile styling trend and engineering requirements,etc.There are many subjective basis of the styling design.In the actual project design process,there will be deviations from the vehicle styling style.This paper presents a design method of automobile front face based on shape grammar.It guides automobile design according to objective modeling analysis data,ensures that automobile front face does not deviate from the style of the whole vehicle,and improves the design of Hong Qi H7 automobile front face on the basis of maintaining the modeling gene.Based on the theory of shape grammar,the genetic region of Hong Qi H7 automobile front face modeling is decomposed into shape feature lines.According to the specific shape structure of each feature line,the shape variables such as angle,curvature or proportion are selected,and a large number of derivative feature lines are obtained through shape evolution.SD semantics difference method is used to analyze the fit degree of each derived feature line to the modeling style of Hong Qi H7 automobile.The semantics expression index is given to the derived feature line,and the function image is generated by fitting the modeling variables of the feature line with the semantics expression index.Contrast function image can get the optimal derivative feature line model when the semantic expression index is maximum.Combine the optimal derivative feature line to get the improved design wireframe of Hong Qi H7 automobile front face.Finally,according to the wireframe,the front face of the car is modeled and rendered,and the improved design model is verified and rationalized.Finally,the improved design model of the front face of the Hong Qi H7 car is obtained.In this paper,the shape grammar,semantics difference method,statistics and computer aided design are applied to improve the design of the front face of Hong Qi H7 automobile.By constructing the functional relationship between the feature line and the semantic expression and quantifying the automobile styling design,the changing trend of the corresponding semantic expression ability of the styling change can be obtained intuitively,and the controllability of style expression in the styling design can be improved.Adding the description method of automobile shape provides a new way of thinking for automobile shape design.