基于语义驱动的日光温室图纸三维建模方法

为了从日光温室施工图纸中重建出温室结构三维模型，提出基于语义映射的施工图纸三维重建方法。首先解析和分类日光温室施工图纸DXF文件，从中识别和理解主要特征构件，建立日光温室构件语义模型并生成分层控制参数，进而基于参数化驱动日光温室三维建模，最后对日光温室三维模型进行真实感渲染。该方法整合CAD制图与三维建模技术，有利于提高日光温室施工图纸的读图效率，建立的三维温室模型具有保真性、交互性和真实感等特性，可用于工程量和造价计算、温室结构优化以及虚拟展示。

Three-dimensional reconstruction method from construction drawings of solar-greenhouses based on semantic driving

The three-dimensional modeling techniques based on construction drawings have illustrated a good prospect of applications in virtual simulation, scene design, engineering modeling and calculation. Due to the complexity and diversity of structure information in construction drawings, the three-dimensional reconstruction based on construction drawings is still a great challenge. In this paper, a modeling method based on semantic mapping was presented to reconstruct three-dimensional models of solar-greenhouses from construction drawings. The construction drawings of solar-greenhouse with DXF formats were analyzed to obtain the structure elements which consisted of basic graphics primitives, text and annotation etc. The semantics models of the main characteristic components of solar-greenhouse were then built, and used to classify these structure elements into individual semantic components according to the recognition and understanding of their coordination, geometric features and text information. Moreover, the parameters models were also defined based on the hierarchical control parameters which consisted of all the structure, topology and texture parameters of the three-dimensional solar-greenhouses. After the semantic mapping mechanism between semantics and parameters models was built, the semantic driving method could conveniently generate the three-dimensional models from construction drawings. Among the above steps, the object-oriented analysis and design were used to refine two-dimensional geometric primitives and three-dimensional objects, and the photo-realistic rendering techniques were used to implement the visualization of the generated models. Based on the semantics-driven and parameters-driven mechanism, the presented method integrated CAD drawings, three-dimensional modeling and visualization techniques to reconstruct the three-dimensional solar-greenhouses from construction drawings. Finally, two sets of construction drawings were respectively tested. The results demonstrate this method is not only beneficial to improve the efficiency in reading the drawings, but the generated model with fidelity, interactivity and photo-realistic features can be used for the construction quantity and cost computation, structural optimization and the virtual exhibition.