ray-casting 中文意思是什麼
ray-casting
解釋
光線衍射-
Meanwhile 3d data sets visualization technology can also widely apply to medicine image field, meteorology field, etc. ray - casting algorithm assumes that 3d space data f ( xi, yj, zk ) distributes on the dots of even or formula reseau
所以數據場可視化技術在石油勘探開發中的應用前景十分廣泛，同時三維數據場的可視化技術也廣泛地應用於醫學影像學、氣象學等領域。 -
Because 3d surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time. in chapter four, the cutting of reconstructed 3d models is explored. in order to observe expediently the size and interspaces structure of inner tissues and avoid the discommodiousness of surface reconstruction, a simple cutting methods based on ray - casting algorithm is presented to get the inner images information
第三章主要對marchingcubes （ mc ）表面重建演算法進行描述， mc演算法是基於規則體數據抽取等值面的經典演算法，本文實現了這種等值面構建表面模型的演算法，並對其演算法的二義性進行了相應的處理；針對其重建速度較慢的問題，提出了體素間相關性處理的方法來加快重建速度；並對其生成的表面幾何模型所包含三角面片數量巨大的問題，提出一種快速有效的三角形邊收縮演算法進行網格簡化，提高了表面模型的繪制速度。 -
Study of accelerating ray - casting algorithm based on space leaping
空間跳躍的光線投射加速演算法研究 -
Based on tree data structure, the cartesian grids about 2 - d and 3 - d configurations are generated using the surface - cutting procedure. in the course of grid generation, a two - step ray - casting algorithm to excluded cells inside the body and a cell - merging technique to avoid numerical instability are fully developed. after creating these surrounding grids, the cell - cutting algorithm is designed to perform geometry - based refinement of grids, and greatly improve the applicability and quality of grid generation
採用物面切割，基於叉樹數據結構，發展了一種普遍適用於二維和三維外形的直角切割網格生成方法；構造兩步射線求交演算法，刪除外形內的固體網格，以及小網格合併演算法，確保網格質量和流場計算的穩定性；運用對任意網格的切割細分演算法，實現了針對幾何外形的自適應網格加密，使得網格生成更具普適性和靈活性。 -
The traditional algorithm of volume rendering is ray - casting, not a proper algorithm for the large 3 - d seismic data, referring some improved method and considering the characteristic of seismic data, a new fast ray - casting algorithm of oriented image space and negative - view transform was brought forward. as a result, this algorithm excels the traditional obviously by speed with image quality in experiment
體繪制的傳統演算法是光線投射法，由於地震數據量大而繪制速度太慢，本文在借鑒一些改進演算法的基礎上，結合地震數據的特點，提出了一種基於圖像空間的逆視變換的加速光線投射演算法，實驗結果表明該演算法在保證相同圖像效果的同時，具有明顯的速度優勢。 -
Secondly, we analyses the volume rendering based on ray casting, includeing algorithm principle, implementation pipeline. and for the features of medical slice images, improved trilinear interpolation algorithm is presented with an increase of the speed ray - casting in direct volume rendering
其次，詳細分析了光線投射體繪制演算法的基本原理、流程步驟，並針對醫學斷層圖像的特點，提出和實現了改進的三線性插值演算法，從而大大提高了光線投射法的繪制速度。 -
Ray - casting volume rendering and some involved technologies, such as shading model, resampling and mapping, are introduced. a new method is presented to mend ray - casting volume rendering
本文重點討論了光線投射體繪制技術的原理和所涉及的光照模型、偽彩色、重采樣、圖像合成等技術。 -
Second, a parallel adaptive ray - casting algorithm for graphic rendering of cfi is developed. in the computational model of cfi, the line - of - sight integration is difficult to obtain for 3d complicated flow field, because curvilinear grids, multizone curvilinear grids, and other irregular grids that are commonly used in computational fluid dynamics ( cfd ) present interesting challenges, such as the complex shapes of cell regions defined by grid points ; the wide variation in the sizes of cells in different regions of the grid ; and the intersecting or overlapping nature of multi - grids. the parallel adaptive ray - casting algorithm is extremely efficient to solve these problems
并行自適應光線投射法繼承了光線投射法適合於任何形式網格的優點；光線與計算網格的交點自適應地反映了原來網格點物理量的分佈，能夠與數值計算的精度保持一致；圖像平面的自適應演算法使我們不必從每一個像素發出射線，既提高了光線投射法的計算效率，同時又保證重采樣后激波這樣的高頻信息不會損失；將并行處理技術引入計算光學流動圖像生成過程，解決了大規模數值模擬結果的處理對計算速度和內存容量的需求。 -
This method got the final image by computing two different groups of resample points and projecting them. the first group of resample points is computed in the way just like the ray - casting method. and the second are gotten like the ones getting by shear - warp algorithm, so the new method can run better and rather fast
該方法是通過兩步求取采樣點來合成最終圖像，即先按光線投射的辦法求出一部分正確的采樣點，然後按shear - warp演算法求剩下的采樣點，這樣既提高了最終圖像的質量，又確保了演算法的運行速度。 -
Applying ray - casting algorithm of volume rendering to the geological data produced by petroleum exploration and exploitation can directly reappear the petroleum ' s status in oil - gas storage, and direct the designers to make sure of the wells " locations and to processes of oil extraction techniques in oil exploitation, in order to raise the profit of the oil production
將體繪制技術中光線投射法應用到石油勘探開發中產生的地質數據中，直觀地再現石油在油氣藏中的狀態，指導設計人員進行井位的確定，以及在石油開采中確定採油工藝的過程，提高石油生產的效益。 -
Unlike ray casting, where each image pixel is built up ray by ray, this approach takes advantage of spatial coherence
但與光線投射演算法不同的是，此演算法利用空間信息對穿過同一切片的所有光線同時處理。 -
Analysis and implementation of volume rendering based on ray casting the related work includes algorithm principle, implementation pipeline and accelerated techniques
基於光線投射的體繪制演算法的分析與實現研究內容包括演算法原理、流程步驟和優化技術。 -
3. presenting a medical visualization testing system this system adopts the volume rendering based on ray casting algorithms and also makes the use of the traditional surface rendering method
實現了一個醫學可視化試驗系統該系統主要採用了體繪制的光線投射演算法，也用到了傳統的面繪制演算法。 -
We combine the algorithm of ray casting and z - buffer to rebuild 3d data, and use marching cubes to create iso - surfaces in 3d regular data sets. several common spatial interpolation are discussed in this thesis, and the famous kriging algorithm in the geological statistics is the emphasis. - four interpolations are used in the case of study, and the results are compared in this thesis
在系統實現中，針對兩類演算法的不同特點，在不同的模塊中選用了兩類演算法中的經典演算法：提出將光線投射法與z - buffer演算法結合實現三維體數據重建；使用移動立方體法實現三維數據場的等值面繪制。
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