There are possibilities to create systems that use virtual humans and animate them in real time. Virtual human can be represented either by the whole body or only by head or face. The virtual human faces are often able to depict expression, even though these systems usually depict human speech. Such virtual humans have a large field of use. They can be part of web pages, educational programs, language training, animated agents etc.
Virtual humans are unusual way to present information to the handicapped people.
For example deaf people can practice their ability to read lips of other person. The creation of a virtual human face is complex task. We have to find a proper method for data representation of the model. These methods are described in chapter 2. The next step is a creation of the facial muscles and subdividing of the model.