Three-dimensional scene local area dynamic flattening method and device based on flattening bounding ball

Abstract

The invention discloses a three-dimensional scene local area dynamic flattening method based on a flattening bounding ball. The method comprises the steps: firstly, defining a flattening bounding ball in a user coordinate system: according to the position and size of a to-be-flattened area, defining a ball as the flattening bounding ball, enabling the bounding ball to closely contain the to-be-flattened area, and enabling the radius of the ball to be as small as possible; secondly, according to the form of the to-be-flattened area, determining a plane tightly attached to the bottom of the to-be-flattened area as a flattening plane; determining a flattening operation projective center; then, transmitting the flattening plane equation parameters, the coordinates of the center of the flattening surrounding ball, the radius of the surrounding ball and the coordinates of the flattening operation projective center into a GPU programmable assembly line; and finally, in a vertex shader of the GPU, judging the spatial relationship among the flattening bounding ball, the flattening plane and the vertex, and performing displacement flattening on the vertex. Compared with a traditional mold repairing software flattening method, the method has the advantages that professional users, professional software and actual model modification are not needed, and the usability is higher.

Description

technical field [0001] The invention belongs to the field of spatial information, and in particular relates to a dynamic flattening method and device for a local area of ​​a three-dimensional scene based on a flattened enclosing sphere. Background technique [0002] The 3D model is an important data basis for 3D applications. Its quality is closely related to the visual effect of the entire scene in the application. A high-quality model can improve the visual effect of the scene, while the existence of a low-quality model will hinder the perception and even affect the application effect. High-quality models generally use manual modeling or lidar modeling, but due to high production costs, they are generally only used for key target modeling in 3D applications of large-scale models. The rest of the sub-key models generally adopt the method of oblique photography, which is suitable for batch modeling of large scenes. Its production cost is low and the production speed is fast,...

AI Technical Summary

Problems solved by technology

[0002] The 3D model is an important data basis for 3D applications. Its quality is closely related to the visual effect of the entire scene in the application. A high-quality model can improve the visual effect of the scene, while the existence of a low-quality model will hinder the perception and even affect the application effect.

However, this method has the following problems: (1) The flattening of the modeling software is essentially a physical damage to the 3D model, resulting in a new inconsistency between the virtual scene and the actual scene. Since its operation is irreversible, it is unacceptable in some applications.

(2) In some 3D applications, it is required to be able to dynamically remove and restore local areas of the 3D scene, which cannot be achieved by using software to edit the model

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