Texture dynamic organization method for fine three-dimensional model

Abstract

The invention discloses a texture dynamic organization method for a fine three-dimensional model. The method comprises the following steps of: opening a three-dimensional scene model, and solving the size of a minimum bounding box of a three-dimensional model; establishing an index tree based on an octree and specifying a maximum recursion depth; recording space coordinates x, y and z of leaf nodes occupied by each part in a building so as to generate a Morton retrieval code of a texture of each part; extracting root nodes of the index tree established by the three-dimensional model; carrying out texture file association on the index tree by use of a dynamic association method; judging whether texture files which have the same texture name and the same resolution exist in brother nodes with the same father node; and repeatedly and circularly traversing and judging until the establishment of the index tree and dynamic association and aggregation of all nodes are completed, and finally outputting a texture index tree with clear hierarchy and good organization and an index file of the texture index tree.

Description

technical field [0001] The invention belongs to the technical field of geographic space information systems, and in particular relates to a texture dynamic organization method of a fine three-dimensional building model. Background technique [0002] Texture data plays a decisive role in the realism of the virtual geographic environment and the recognition ability of rapid perception. In the current 3D city construction process, fine 3D building models are more and more valued by users, and there are two main ways of expression: First, fine 3D building models can be rendered at different levels of detail based on simple wireframes Or use different methods to draw light and shade; Second, many 3D models express more details by mapping textures, making the models look more realistic and detailed. At the same time, due to the fusion of fine 3D building models such as BIM and GIS data, most of the fine 3D building models are composed of many building parts, and each part has rel...

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Problems solved by technology

[0011] The process of the above texture data organization methods is a static organization process, and each has its own limitations

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