Ellipsoidal drawing collaborative optimization method based on digital earth

A digital earth and collaborative optimization technology, applied in the field of visualization, can solve problems such as poor rendering performance, meaningless light sampling points, and failure to achieve smooth display, etc., to reduce complex calculations, optimize trilinear interpolation calculations, and reduce the number of sampling points Effect

Active Publication Date: 2022-05-17
NO 15 INST OF CHINA ELECTRONICS TECH GRP +1
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Problems solved by technology

However, the current volume rendering on Digital Earth generally involves a small range, and most of them use prism bounding boxes or spheres as proxy geometry. However, for the volume rendering of Digital Earth, there are still the following problems to be solved: Included in the interior, the light sampling points inside the earth are meaningless; the display data on the back of the earth also needs to be eliminated; currently, the overall rendering performance of global volume rendering is poor, and smooth display cannot be achieved

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  • Ellipsoidal drawing collaborative optimization method based on digital earth
  • Ellipsoidal drawing collaborative optimization method based on digital earth
  • Ellipsoidal drawing collaborative optimization method based on digital earth

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] The invention provides a collaborative optimization method for ellipsoid rendering based on digital earth, which specifically includes:

[0036] (1) Basic principle of ray casting volume rendering algorithm

[0037] like figure 1 As shown, the ray-casting (Ray-casting) algorithm is an image-oriented direct volume rendering algorithm: starting from each pixel on the screen, a ray is sent along the direction of the line of sight; along the ray through the volume data bounding box Interpolation sampling of discretized data on the path, through the transfer function, the value of each sampling point obtained by trilinear interpolation is converted into color value and opacity; along the direction of the light according to front to back or from back to front Combine these sampling points (points on the cube on the right side) in order to calculate the ...

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Abstract

The invention discloses an ellipsoid drawing collaborative optimization method based on the digital earth. By using the method, efficient global or large-range volume rendering covering the digital earth can be realized, the average frame rate is 30FPS or above, and the method has a film fluency level. According to the method, the actual calculation number of light sampling points is greatly reduced by constructing the proxy ellipsoid geometry, the data ellipsoid shell three-dimensional grid bounding box and the digital earth ellipsoid and skipping the light sampling points or terminating light sampling in advance (mainly eliminating the sampling points in the earth and on the back of the earth); meanwhile, data of the ellipsoid shell three-dimensional grid are organized into three-dimensional textures, calculation of ellipsoid trilinear interpolation and a transfer function is optimized through efficient texture query based on a GPU, and finally the volume rendering performance facing the digital earth is integrally improved.

Description

technical field [0001] The invention relates to the field of visualization technology, in particular to a collaborative optimization method for ellipsoid rendering based on digital earth. Background technique [0002] Digital Earth is becoming more and more popular, and there are various three-dimensional realization versions, for example, Google Earth, NASA WorldWind, ESRI Globe, AGI Cesium, etc. For natural environment elements: weather, electromagnetic, etc., data visualization based on Digital Earth is very urgent in practical applications. Among various visualization algorithms, ray-casting volume rendering is one of the more famous visualization methods, which is applied in the fields of medicine, meteorology, aviation, electromagnetics, surveying and mapping, etc. important means of information. However, the current volume rendering on Digital Earth generally involves a small range, and most of them use prism bounding boxes or spheres as proxy geometry. However, for...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00G06T15/08G06T15/50G06T17/10G06T17/20
CPCG06T15/005G06T15/08G06T15/50G06T17/10G06T17/20
Inventor 王家润杨胜利李志强任菲田壮黄志敏王凯
Owner NO 15 INST OF CHINA ELECTRONICS TECH GRP
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