A New Shape Function for Simulating a Single Facial Wrinkle
Zainal Azmi, Nurazlin (2006) A New Shape Function for Simulating a Single Facial Wrinkle. Masters thesis, Universiti Putra Malaysia.
Many efforts have been taken to generate realistic facial modeling and animation. This is inspired by the increasing appearance of virtual characters in film and video, inexpensive desktop processing power, and the potential for a new 3D immersive communication metaphor for human-computer interaction. Wrinkles are important for realistic facial animation and modeling because they aid in recognizing human's expressions as well as person's age. Different techniques have been used to generate wrinkles, whether it is fine-scale or large-scale wrinkles. This research focuses on introducing a new shape function for simulating a single wrinkle. However, it does not take into account the facial animation, and hence the modeling is only concerns with the wrinkling process triggered by user interaction. To carry out this research, a simple method that allows the user to control the shape and location of the wrinkle is used. The process involves two major steps. The first step is to construct a face mesh, either by scanning through digital scanner or modeled by using a CG software and correctly upload it into the program. The second step is to perform the wrinkling process. In this process, user will draw a stroke on top of the face mesh to represent the wrinkle by using the mouse. Points on the stroke are stored in a vector array and interpolated to obtain evenly closer distributed points. Once this is done, the program is then required to find triangular meshes affected by the stroke drawn earlier and subdivide it into smaller triangular meshes. These triangular meshes need to be interpolated as well to produce evenly distributed points. Then, the wrinkle shape function is applied to the wrinkle points to see the effect of the wrinkle simulation. In the end of this research, we will show that the research objective made is successfully achieved through the observation made by the third parties, and the wrinkle produced does meet the properties of real wrinkles.
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