最近因为研究需要,回顾了一下BDPT,主要看VEACH的那篇论文,同时参考了pbrt,mitsuba的实现,自己写了一份新的bdpt实现.以前实现的那一份BDPT不是基于物理的,而且无法处理镜面和透明物体.这次这个完全按照VEACH论文实现,应该是没有这些问题了.不过一些BUG是改得我很头疼,到目前也还没有完全搞定.brdf的部分不太熟悉,很多地方也不知道是不是实现正确了.总之先这样吧,留下几张最近的渲染结果在这里. 还有很多需要改进的地方,不过今天先到此为止吧. (注:图片中模型来源于网络)…

本人水平有限,若有错误也请指正~ 前文提及了光线追踪的一些常用手法,但是其中path tracing的实现最为简单,但是其最致命的一个缺点就是图像收敛速度很慢..原因在于从摄影机发射出的每一条光线若不与场景中的光源相交,则这条光线就是无贡献的,或者遇到了一个漫反射表面,该表面反射环境光的值很低,这时候这条光线就成为了一条低贡献的光线,同时也可能增加整体图像的噪点数量. 这时候bidirectional path tracing提出了,其基本思想是从摄影机和光源两个视角出发,如下图所示, 光线分别…

全局光照这个名词在计算机图形学里已经不算一个新名词了,现在一提到拟真度,很多人基本上都会去想到全局光照,这个名词上世纪七八十年代就有了,好像是由一个叫Jim Kajiya的大神在他那篇已经被引用了不知道多少次的论文里<The Rendering Equation>里提出来的,现在很多全局光照算法基本上都是由这论文里面的一个公式推导出来的,可知其厉害之处了,其实主要思想很简单. 但是说到全局光照,其实就是对自然界的光子在场景中的实际行为进行模拟,把模拟的结果呈现给我们而已,但是模拟的话就得考虑一…

Computer Graphics Research Software Helping you avoid re-inventing the wheel since 2009! Last updated December 5, 2012.Try searching this page for keywords like 'segmentation' or 'PLY'.If you would like to contribute links, please e-mail them to rms@…

之前一直在考虑这样一个问题,在实际生活中的光源都是有体积的,但是图形学中,很多时候我们用简单的点光源,面光源,或者方向光来模拟实际生活中这些光源,势必会产生一些误差,同时导致很多效果不好做.那么在离线渲染中要怎么对不规则光源进行渲染呢?首先很容参考的是之前我用path tracing模拟环境光照的例子(http://www.cnblogs.com/starfallen/p/3520021.html),即给光源所包含的所有三角面加上一个发光属性,然后直接使用path tracing渲染场景,当从视…

这段时间一直在看Metropolis Light Transport(简称mlt),现利用这篇博文把之前看资料已经coding上的一些体会记录下来. 1.Before MLT 在MLT算法被提出之前,最热的GI算法bidirectional path tracing虽然对比于basic path tracing已经有了效率上的明显提高,但是对于复杂场景的表现力仍显不足.那时候人们已经知道基于path的GI算法的效率关键在于找到有效路径的效率.先说有效路径是什么,简单地说就是从光源出发,在场景中反…

全局光照(Global Illumination,简称 GI), 作为图形学中比较酷的概念之一,是指既考虑场景中来自光源的直接光照,又考虑经过场景中其他物体反射后的间接光照的一种渲染技术. 大家常听到的光线追踪,路径追踪等同样很酷的概念,都是全局光照中人气较高的算法流派. 而这篇文章将围绕全局光照技术,介绍的要点有: 全局光照的基本概念 全局光照的算法主要流派 全局光照技术进化编年史 光线追踪 Ray Tracing 路径追踪 Path Tracing 光线追踪.路径追踪.光线投射的区别 环境光…

games101 - 4 - Ray Tracing 目录 games101 - 4 - Ray Tracing 为什么需要Ray Tracing Recursive (Whitted-Style) Ray Tracing Ray-Surface Intersection Bounding Volumes Spatial Partitions Bounding Volume Hierarchy (BVH) Radiometry Bidirectional Reflectance Distribu…

大家好~这三个月以来,我一直在学习和实现"基于WebGPU的混合光线追踪实时渲染"的技术,使用了Ray Tracing管线(如.rgen..rmiss等着色器). 现在与大家分享和介绍我目前的学习成果,希望对大家有所帮助!谢谢! 通过国外的开源项目,可在WebGPU中使用Ray Tracing管线 这三个月我对Ray Tracing的研究有了质的突破,主要归功于我发现的WebGPU Node开源项目! 该作者首先在dawn-ray-tracing开源项目中对"dawn项目:C…

目录 一. 前言 1.1 本文动机 1.2 PBR知识体系 1.3 本文内容及特点 二. 初阶:PBR基本认知和应用 2.1 PBR的基本介绍 2.1.1 PBR概念 2.1.2 与物理渲染的差别 2.1.3 PBR的特征 2.2 PBR的衍变历史 2.2.1 Lambert(1760年) 2.2.2 Smith(1967年) 2.2.3 Phong(1973年) 2.2.4 Cook-Torrance(1982年) 2.2.5 Oren Nayarh(1994年) 2.2.6 Schlick(…

第五部分 性能调优与架构篇 本篇将为读者介绍性能调优的一些背景知识和理论,然后介绍一些工具的运用,最后介绍从应用程序到操作系统.到数据库.到存储各个环节的优化. 性能调优是一个高度专业的领域,它需要一定的方法论做指导,我们需要有一定的背景知识和方法论做引导,才能提出正确的问题,正确的问题往往意味着有解决问题的可能性,这也是我们在处理各种事务的时候最难知道的.提出正确的问题是一种能力,也是可以训练出来的.本篇将花大量篇幅叙述各种调优方法,并分享笔者从业多年来的一些经验和意识,目的是和大家沟通有无,…

Wormholes Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 46123 Accepted: 17033 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path…

 POJ 3259 Wormholes Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu   Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way…

Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a time that is BEFORE you entered the wormhole! Eac…

After working with DCC software for so many years, I saw the realtime solution went forward so much, also more and more low-level. As the game engine, 10 hears ago the game engine was such a challenge that now everything become so cheap, everybody co…

Wormholes Time Limit: 2000 MS Memory Limit: 65536 KB 64-bit integer IO format: %I64d , %I64u   Java class name: Main [Submit] [Status] [Discuss] Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A w…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 38300   Accepted: 14095 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 33008   Accepted: 12011 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 35103   Accepted: 12805 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 35235   Accepted: 12861 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

题目链接:http://poj.org/problem?id=3259 Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 44090   Accepted: 16203 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is ver…

题目链接:http://poj.org/problem?id=3259 Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 45077   Accepted: 16625 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is ver…

点击打开链接 Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 25582   Accepted: 9186 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one…

题目连接 http://poj.org/problem?id=3259 Wormholes Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a tim…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 34302   Accepted: 12520 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 24249   Accepted: 8652 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way pa…

http://poj.org/problem?id=3259 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a time that is BEFOR…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 24864   Accepted: 8869 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way pa…

Wormholes DescriptionWhile exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a time that is BEFORE you entered the worm…

Wormholes Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 42366 Accepted: 15560 传送门 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…