Sunlight Greenhouse Design And Visualization Study

This paper introduces solar greenhouse interactive designing and visualization system and presents its main structure, key technologies and implementation. According to the study and analysis on Beijing present typical solar greenhouse structure, I extract the main elements and features of the structure and realize an prototype of solar greenhouse structure designing system using computer aided design, user-computer interact and three-dimension visualization technologies. The main work and study results of the thesis are as follows:1. Solar greenhouse Design System two-dimensional interactive technology. two-dimensional Designing uses "drag-and-drop" drawing way, and in order to meet the need of actual drawing, put forward and implement the geometric constraint algorithm based on "intersection area", which improves the intelligence of two-dimensional drawing.2. Study on two-dimensional designing to three-dimensional structure conversion. Achieve the mapping and conversion from two-dimensional coordinates to three-dimensional coordinates.3. Implement the import of multi-source 3DS models. Through reading 3DS files, the 3DS models can be added to the system scene, so that it riches the function of system. And the model adopted "standardized" processing, so we can control them effectively; Through the use of polygon mesh technology, implement the embedded of the model. And it makes 3DS model can be embedded into other objects in the three-dimensional scene.4. Use Bezier surface as the roof of solar greenhouse. Through the control-point of Bezier surface, we can achieve the control againt the shape of Bezier surface.5. In the greenhouse 3D display, the use of blending technology implements transparent texture of greenhouse, and it makes 3D greenhouse more realistic.Furthermore, the system uses modular designing and object oriented designing, so it makes the system have a good maintance and scalability. So it provides a good base to further study on the solar greenhouse. According to the test of the system, it proves that the system is very easy to use intwo-dimension user interface and its generated three-dimension model is good. So you can use the system to design a solar greenhouse model quickly.