Research On Coherence Of Volume Ray-Casting Algorithm

Visual in Scientific Computing is the fields of science that developed in the early 90s.It can be generated by scientific computing and the final results of the intermediate is converted to an intuitive visual images of people and can interact to deal with it.For speeding up data processing speed,insight into the nature of a variety of physical phenomena and play an important role in control of the process of scientific development.VISC research is the core issue of three-dimensional visualization of Data Field.Three-dimensional Data Field can be expressed as the distribution of three-dimensional space in a single-valued function S=f(x,y,z),If S is a scalar soit is scalar field,As a vector for the vector field.Recently,the data visualization field study focused on the scalar field.In recent years,Volume Rendering is rapid development with a three-dimensional Data Field visualization methods,so visualization became a hot research field.Volume ray-casting algorithm for Volume Rendering as an important method,its principle is adopted as the distribution of each voxel opacity and color of the approach to the synthesis of images,so it can beneficial to retain image detail,rendering high-quality images,Especially suitable for mapping the regional characteristics of the three-dimensional fuzzy image,which is widely used.This article first overall explore and study Volume Rendering,Category talk about several major Volume Rendering algorithm,which focuses on the sequence of image space for Volume ray-casting algorithm and analysis of their differences and characteristics.According to some weak points of Volume Ray-casting algorithm given a number of solutions,mainwork as follows.1.In order to reduce the rotation transformation of three-dimensional data field by the each change of viewpoint,there must be a transformation from object space coordinates to the corresponding image space coordinates.We use the auxiliary plane methord,only need to rotate the imaging plane to object space coordinates.Then synthesis image in the auxiliary plane.Use the synthesis of 2D image as a 2D texture, using hardware to complete the object space coordinates to image space coordinates of the rotation transformation.2.Find the Volume Ray and intersection of(x,y,z) planar cluster relevance, can quickly determine the body light on the value and characteristics of sampling points and given the determination of methods of sampling points.Reduce the interpolation computing complexity.3.Apply the coherence of Volume Ray-casting Algorithm to three-dimensional temperature field of Volume Rendering.That including on the conditions of additional geographic information about how to speed up the data mapping of the geographical coordinates and then use Volume Ray-casting algorithm for Volume Rendering three-dimensional temperature field in the realization of volume rendering.