基于高度差求交的点元表面的光线跟踪算法

图学学报

基于高度差求交的点元表面的光线跟踪算法

1. 江苏航空职业技术学院航空工程学院，江苏镇江 212134；
2. 江苏航空职业技术学院镇江市无人机应用创新重点实验室，江苏镇江 212134

出版日期:2017-08-31 发布日期:2017-08-10
基金资助:
国家自然科学基金项目(60825203，U0935004)

A Ray Tracing Method of Splat-Based Surface Using Height Difference#br# Intersection

1. Aeronautical Engineering Institute, Jiangsu Aviation Technical College, Zhenjiang Jiangsu 212134, China;
2. Zhenjiang Key Laboratory of UAV Application Technology, Jiangsu Aviation Technical College, Zhenjiang Jiangsu 212134, China

Online:2017-08-31 Published:2017-08-10

摘要/Abstract

摘要： 针对点元表面的光线跟踪方法存在轮廓和尖锐部分绘制效果差等缺点，提出基于
高度差求交的点元表面光线跟踪方法。通过融合光线上迭代点与点元面片投影之间距离，计算
迭代点到相应点元表面的高度差函数，并以高度差为步长进行点元表面交点的迭代计算。高度
差函数符合点元表面上点元融合部分的几何特征。算法结果表明，在点元表面轮廓和尖锐部分
光线跟踪产生的图像质量高，且收敛性好、计算成本低。

Abstract: The main drawbacks of current ray tracing methods for splat-based surface are coarse
rendering effects in the parts of silhouettes and sharp features. A ray tracing method for splat-based
surface is proposed based on the high computation function defined by blending projective distances
between the point of ray and the corresponding splats. And the height difference is used as step length
to compute iteratively intersection. The height difference function is closed to geometric features of
splat-based surface. Experiment results show that the method has good rendering quality in the parts
of silhouettes and sharp features, and high convergence rate as well as low computation cost.

Key words: splat-based surface, height difference, intersection, implicit surface

蔡鹏1,2，师平1,2，范月圆1,2. 基于高度差求交的点元表面的光线跟踪算法[J]. 图学学报.

CAI Peng1,2, SHI Ping1,2, FAN Yueyuan1,2. A Ray Tracing Method of Splat-Based Surface Using Height Difference#br# Intersection[J]. Journal of Graphics.