Study On Realism Branches Modeling Based On Parameterized Curve

The simulation of trees is one of the leading issues of computer graphics in the field of forestry visualization applications. The morphology of trees plays an important part in their growth. In the process of tree geometry modeling, the simulation of tree branches'bending state is very important. The paper includes the tree modeling and the virtual scene building. Tree modeling uses the iterated function system based on fractal theory. The parameterized curve is used to simulate the bending state of tree branches. Bezier curve, a free curve based on controlled points, is used to simulate dynamic of the branch axis curve. Generalized cylinder, a three-dimensional with Bezier curve as the axis, is used to define the branch. In the visualization of scene, the "diamond-square" algorithm based on random midpoint displacement is used to simulate the fractal terrain. As a result, a three-dimensional virtual scene is built. Experiments show that, compared to previous branches simulated by cylinder, Bezier curve can simulate the bending and smooth state of branches better. The tree model better reflects the true characteristics of real tree.