Tree three-dimensional visualization model realization method based on Sphere-Board

Abstract

The invention discloses a tree three-dimensional visualization model realization method based on Sphere-Board. The method mainly solves the problems that an existing billboard or crossing plane model will deform when overlooked, the three-dimensional sense of the model is poor, and illumination calculation is hard to realize. According to the tree three-dimensional visualization model, a spherical curved surface is adopted to conduct geometrical approximation on an entire crown, and more details concerning branches and leaves are expressed through a texture synthesis method; given that outline edges of a projection of the crown are excessively smooth and continuous when the spherical curved surface is used for expressing the crown, the visual sense of reality of the edges of the crown will be weakened, so a shape remolding process is added for the rendered edges of the crown. The model is suitable for tree varieties with neat crown shapes and dense branches and leaves without holes. The method comprises the main steps of acquiring feature points of the crown to generate the spherical curved surface approximate to the geometrical shape of the crown, completing calculation of texture coordinates through the curved surface texture synthesis technology, dynamically extracting the rendered outline edges of the crown and remolding the shape of the outline edges.

Description

technical field [0001] The present invention relates to the technical fields of computer application, computer graphics and geographic information, and in particular to a method for realizing a three-dimensional tree visualization model based on Sphere-Board (spherical surface). Texture synthesis method expression. This model reflects the balance between the pursuit of model realism and rendering performance. Experiments have proved that when the tree model generated based on the method of the present invention is applied to a three-dimensional scene, it can not only meet the requirement of realism in visual effects, but also ensure real-time rendering and smooth interaction of the scene. Background technique [0002] The modeling and rendering of trees has always been one of the research hotspots and difficulties in the field of computer graphics and virtual reality. Based on different research focuses, researchers have successively proposed three-dimensional visual repre...

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Problems solved by technology

[0005] Purpose of the invention: To solve the problems existing in the existing three-dimensional visualization methods of trees, some models have a better visual sense of reality, but the geometric complexity of the model is high, and it is difficult to achieve real-time rendering and interaction; some simplified models, such as billboards (Billboard) Model and crossing plane (CrossingPlane) model have low geometric complexity and superior rendering performance, but there are obvious visual defects. The present invention provides a tree 3D visualization model that takes into account both visual effects and rendering performance, which can satisfy the sense of visual realism requirements, and the geometric complexity of the model is not high, which can meet the needs of real-time interaction of scenes in the application

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