Method for keeping graphic object equal-pixel area display in three-dimensional perspective projection scene

Abstract

The invention discloses a method for keeping graphic object equal-pixel area display in a three-dimensional perspective projection scene, wherein in a three-dimensional graphic frame updating event, an actual proportion parameter of a graphic object is dynamically calculated according to information such as an Fov (Field Of View) of a three-dimensional viewport and a visual section body vertical-horizontal ratio, in combination with a spatial position (depth information) and a basic proportion coefficient of the graphic object, and by virtue of the characteristic that the FOV and width and height of the viewport are statically unchanged, and a pixel area of the graphic object is kept unchanged through projection transformation at different observation positions and from different observation perspectives. The method for keeping the graphic object equal-pixel area display in the three-dimensional perspective projection scene disclosed by the invention ensures a three-dimensional stereoscopic effect of the graphic object through perspective projection, carries out calculation by designing a rational mathematic calculation model, is high in calculation efficiency, keeps a stable graphic display effect in case of scene changes, and will not lead to a phenomenon of pixel area jumping.

Description

technical field [0001] The invention relates to the technical field of three-dimensional situation display, in particular to a method for maintaining the display of pixel areas such as graphic objects in a three-dimensional perspective projection scene. Background technique [0002] In various simulation and application information systems, through real-time access to geospatial data such as remote sensing / reconnaissance images, digital elevation models, and vector topographic maps, it can be tailored in the spatial range and fused into raster image data of the region to build a realistic 3D scene; through the detection and processing of sensors such as radar and electronic reconnaissance, the aircraft flying in the air, ships sailing on the sea, vehicles moving on land and other moving targets are displayed in the 3D scene, and at the same time in the 3D scene It is also necessary to express some information such as icons, text, vector graphics, models, etc., such as static...

AI Technical Summary

Problems solved by technology

[0003] The traditional way is to use orthogonal projection, but the use of orthogonal projection will cause the object to have no depth information and lack a three-dimensional sense, such as image 3 shown

In addition to the above-mentioned method of using orthogonal projection, you can also use the method of dynamically changing textures or rebuilding graphics, but the above-mentioned method has a large overhead in display efficiency, and the transition effect is not smooth, prone to jumping phenomenon

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