Constraint solving based on a simplified method of cluster

The traditional geometric constraint problems are focus on two dimensions, but in this paper, we do our research on three-dimensional geometric elements. Firstly, we translate geometric constraint problem into the form of analytic geometry, and then apply these basic knowledge to geometric assembly. We also introduce the definition of cluster in order to translate the geometric constraint problem into it. After simplified clusters, we can determine the location and coordinates of them according to the knowledge of corresponding analytic geometry, and finally determine the location of geometric elements.