Research And Application On Reusability Of 3D Hair

With the development of computer performance, the simulation of 3D hair becomes a new hotspot in the research field of virtual reality recently. In the film and television animation, the vivid dynamic effect of hair can bring a strong sense of visual impact to the audience. And in the computer game field, replacing the hairstyle for virtual roles is still an important part to meet the customized requirement of game players. In recent years, game enthusiasts and game manufacturers have launched many model modifications which are convenient for the users to design and select their desired model. Research on the reuse of 3D hair model not only can reduce the waste of developers’ manpower and financial resources, but also can extend the users’selection range. Its practicability and commercial value is self-evident.Since each model has its own size and initial position, there may be spatial offset or size mismatch, when the non-native hair model is replaced to the target head model. Even if the size and spatial location of the model can fit. due to the curvature difference between the 3D hair and human head model, the edge of hair model and the head model might separate probably. In the view of the above issues, this thesis proposes a 3D hair reuse method based on the features of hair scalp layer. Firstly, according to the data storage structure of the model file, the scalp layer and its feature points are extracted from the hair model. Secondly, combined with the 2D face image recognition method, the feature points of the region of hair root on head cortex are detected. Thirdly’, based on the feature points of the two models, the translation and scale factors are calculated and some geometric operations with respect to these factors are carried out on the hair model at the same time. Finally, the fitting process of the scalp layer and the head model is handled carefully, which makes the 3D hair tightly attached to the target model of human. Thus, the hair reuse is done. According to the proposed 3D hair reuse method, this thesis develops a 3D hairstyle replacement system and completes the reuse of eight 3D hair models via the mouse actions and keyboard operations. The experiment results show that the proposed method can improve the reusability of 3D hair models effectively and it will never be influenced by the restrictions of the personality characteristics of the hair model or the hair root distribution on the head cortex.