V-Ray DMC采样器原理释疑

各采样器比较

自适应细分是一个几乎所有其他“有偏差的非物理渲染器”（注1）都在采用的算法。它是一种相对来说有点老式，但在绝大多数情形下都非常好用的算法。它会算出干净且采样细致的图像结果，在静帧渲染时的表现非常出色，但是与DMC采样器相比，自适应细分往往会在一些本可以采样再少一点的地方过多采样
DMC采样器，那么要在某些同样的地方求出同样质量的反射模糊可能就不用这么多样本，DMC是目前在求取镜头景深和三维运动模糊时最好用（时间短质量高）的光线追踪采样算法

详解“采样”，自适应采样

计算机自己判断出在有必要的时候，才增加对个别像素的采样。这就是自适应采样技术，因为采样的数目是依据图像的复杂程度而适应性变化的。那么在颜色对比比较明显的地方采样数量会增加
自适应细分和DMC采样的共同点是它们都是自适应性的采样算法，但是工作机制不同

细分采样器

细分算法的采样点是处于如图所示的像素顶角上，初始样本采集到信息以后，细分采样器会分析这些信息，然后来决定哪些像素需要更多的采样样本。每一个像素边角上的样本都被拿来比较，如果某个像素的色差大于参数面板中设定的颜色阈值（下图所示），Vray就会进一步细分这个像素，并且在这个像素上采集更多的样本
难以理解，先放着

产品随想 | 周刊第130期：集结信徒，而非官僚

On Dyson, techno-centric design and social consumption https://2earth.github.io/website/20250707.html 如何創造偉大的事物 https://ryolu.notion.site/1610a94b9c108079a95be4362afd4a26 集結信徒，而非官僚 Reflections on OpenAI https://calv.info/openai-reflections 创业架构 Shui https://github.com/rock-zhang/Shui 好好喝水 https://www.ghibli.jp/works/ 吉卜力作品的高清图 From Skeuomorphic to Liquid Glass: Apple's Strategic Bet on the Post-Touch Future https://omc345.substack.com/p/from-skeuomorphic-to-liquid-glass 迄今为止关于苹果Liquid Glass变革的解读，最好的一篇 The Nueva School https://en.wikipedia.org/wiki/The_Nueva_School?useskin=vector 看起来是很酷的一个学校 The Barbican https://arslan.io/2025/05/12/barbican-estate/ 史蒂夫·乔布斯希望你阅读的 9 本书 https://www.douban.com/doulist/147158849/ 《禅者的初心》里有句话：“做任何事，其实都是在展示内心的天性，这是我们存在的唯一理由。” Chuck Feeney was one of the greatest philanthropists ever https://www.gatesnotes.com/Remembering-Chuck-Feeney 慈善家 My new deadline: 20 years to give away virtually all my wealt...

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《Becoming Steve Jobs》Chapter 16 Blind Spots, Grudges, and Sharp Elbows

Steve could be pretty thin-skinned when someone prominent criticized the aesthetics of his products. He took great umbrage that Neil would, as Steve put it, “pop off in public like that without coming to talk to us about his technical concerns first.” From that point on he had rebuffed all of Neil’s attempts to smoke the peace pipe. 有趣 He had blind spots, grating behavioral habits, and a tendency to give in to emotional impulse that persisted his entire life. These characteristics are often used to make the case that Steve was an “asshole” or a “jerk,” or perhaps simply “binary”—that odd adjective often used to convey the sense that he was half asshole/half genius from birth to death. These aren’t useful, interesting, or enlightening descriptions. What’s more illuminating is to take a look at the specific ways in which Steve failed to do an effective job of tempering some of his weaknesses and antisocial traits, and to consider how, when, and why some of them continued to flare up even...

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A Sister’s Eulogy for Steve Jobs

I grew up as an only child, with a single mother. Because we were poor and because I knew my father had emigrated from Syria, I imagined he looked like Omar Sharif. I hoped he would be rich and kind and would come into our lives (and our not yet furnished apartment) and help us. Later, after I’d met my father, I tried to believe he’d changed his number and left no forwarding address because he was an idealistic revolutionary, plotting a new world for the Arab people. Even as a feminist, my whole life I’d been waiting for a man to love, who could love me. For decades, I’d thought that man would be my father. When I was 25, I met that man and he was my brother. By then, I lived in New York, where I was trying to write my first novel. I had a job at a small magazine in an office the size of a closet, with three other aspiring writers. When one day a lawyer called me — me, the middle-class girl from California who hassled the boss to buy us health insurance — and said his cl...

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黑客技术论坛推荐

原文来自知乎，世界各大黑客技术论坛TOP排行榜，表示感谢这份名单基本上囊括了目前世界上各大最佳黑客技术论坛。

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巴菲特致股东信-1980年

笔记：会计中对于下属股权公司的记账方式有3种：持股50%以上，全部并入持续20%--50%，则按持股比例并入持股20%以下，则以实际收到的利润返还，计入报表这种会计方式，会导致伯克希尔旗下，不少的企业，未能暴露实际的收益情况对伯克希尔而言，对盈余的认定并非取决于持股比例是100%，50%，20%，5%或是1%，盈余的真正价值在于其将来再投资所能产生的效益我们宁愿将所赚的盈余继续交由不受我们控制的人好好发挥，也不希望转由我们自己来浪费高通货膨胀等于是对投入的资本额外课了一次税翻译： https://xueqiu.com/6217262310/131837878 https://archive.ph/XMX5n 原文： Buffett’s Letters To Berkshire Shareholders 1980 巴菲特致股东的信 1980 年 Operating earnings improved to $41.9 million in 1980 from $36.0 million in 1979, but return on beginning equity capital (with securities valued at cost) fell to 17.8% from 18.6%. We believe the latter yardstick to be the most appropriate measure of single-year managerial economic performance. Informed use of that yardstick, however, requires an understanding of many factors, including accounting policies, historical ca...

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360T7 刷机步骤及固件

https://cmi.hanwckf.top/p/360t7-firmware/ 360T7的固件支持由immortalwrt-mt798x项目提供支持，请参考： https://cmi.hanwckf.top/p/immortalwrt-mt798x https://github.com/hanwckf/immortalwrt-mt798x 刷机步骤参考此处的办法开启原厂固件的UART和telnet功能在以下链接下载360T7测试固件（纯净版，无任何插件） https://wwd.lanzout.com/b0bt9idwd 密码:ezex （此固件已过时，请选择其它更新的固件）接下来将刷入修改版uboot。修改版uboot的优点有：固件分区可达108MB，原厂uboot只能使用36M 自带一个简单的webui恢复页面到以下仓库的Release页面下载uboot，目前暂时仅支持360T7，后续将支持更多mt798x路由器。推荐使用 mt7981_360t7-fip-fixed-parts.bin ， fixed-parts 代表uboot分区表在编译期间固定，不会随着uboot环境变量变化。 https://github.com/hanwckf/bl-mt798x/releases/latest 将 mt7981_360t7-fip-fixed-parts.bin 通过HFS等方式上传到路由器，使用以下命令刷入uboot mtd write mt7981_360t7-fip-fixed-parts.bin fip 确认刷入完毕后，拔掉路由器电源。然后将电脑的IP地址设置为固定的 192.168.1.2 ，接着按住路由器的RESET按钮后通电开机，等待8s后用浏览器进入 192.168.1.1 在uboot恢复页面选择要刷入的固件。immortalwrt-mt798x目前编译两个版本的360T7固件。建议修改版uboot直接使用 immortalwrt-mediatek-mt7981-mt7981-360-t7-108M-squashfs-factory.bin ，两种固件区别如下： mt7981-360-t7-108M 为108M固件分区，原厂uboot不可启动，需要修改版u...

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写给大家看的中文排版指南

作者：Hindy 原文地址： http:// zhuanlan.zhihu.com/uici rcle/20506092 前言：很遗憾，我们的周围充斥着大量排版丑陋的文章。我国的字体排印与日本、美国等设计强国差距实在太大。我希望能够做些力所能及的小事，让更多人意识到“设计”的价值和其必要性，创造更美好的视觉环境。本文旨在帮助普及、提升大家对文字排版的认识，让大家在平时的学习工作中能有更专业的文字排版素养。必看人群：设计师、编辑、作家、撰稿人、教师、学生目录： 1. 中文排版 1.1 引号 1.2 省略号与破折号 1.3 行首行尾禁则 2. 西文排版基础 2.1 西文撰写基础 2.2 西文标点相关 2.3 斜体的用法 2.4 大小写的区别 3. 中西文混排 3.1 基础原则 3.2 标点相关 1. 中文排版 1.1 引号我国国家标准要求弯引号，个人建议使用直角引号。示例：你竟然喜欢“苹果表”？引号中再用引号使用双直角引号。示例：我问他，“你竟然喜欢‘苹果表’？” 当引号表示讽刺、反语暗示时，使用弯引号（用法参考“西文排版”部分）。示例：说真的，我也很 “喜欢”“苹果表”哦。 1.2 省略号（删节号）与破折号省略号占两个汉字空间，包含六个点。正确示例：中国设计还有太长路要走…… 错误示例：中国设计还有太长路要走… 破折号占两个汉字空间。示例：中国设计还有太长路要走──加油罢。 1.3 行首行尾禁则点号（顿号、逗号、句号等）、结束引号、结束括号等，不能出现在一行的开头。错误示例：排版时注意某些符号不能在行首，别弄错了。正确示例：排版时注意某些符号不能在行首，别弄错了。开始引号、开始括号、开始双书名号等，不能出现在一行的结尾。错误示例：她对我们说：“ 这书太赞了。” 正确示例：她对我们说： “这书太赞了。” 2. 西文排版基础 2.1 西文撰写基础句首字母大写。单词间留空格。示例：Have a question? 2.2 西文标点相关点号后加一个空格（如逗号、句号等）。示例：Hello everyone! Welcome to my blog....

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Steve Jobs at 44, By Michael Krantz, 1999

Differences and Similarities Between Apple and Pixar Apple turns out many products--a dozen a year; if you count all the minor ones, probably a hundred. Pixar is striving to turn out one a year. But the converse of that is that Pixar's products will still be used fifty years from now, whereas I don't think you'll be using any product Apple brings to market this year fifty years from now. Pixar is making art for the ages. Kids will be watching Toy Story in the future. And Apple is much more of a constant race to continually improve things and stay ahead of the competition. His Role At Pixar At Pixar my job is to help build the studio and recruit people and help create a situation where they can do the best work of their lives. And to some degree it's the same at Apple. But at Pixar, I don't direct the movies, whereas at Apple probably, if I had to pick a role out of a film production, I'd be the director. So it...

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巴菲特致股东信-1973年

笔记：在上一年度预测的今年竞争加剧导致利润下滑，真的发生了翻译Link：雪球：https://xueqiu.com/6217262310/131257618 备份：https://archive.ph/KIfdT 原文： To the Stockholders of Berkshire Hathaway Inc.: Our financial results for 1973 were satisfactory, with operating earnings of $11,930,592, producing a return of 17.4% on beginning stockholders' equity. Although operating earnings improved from $11.43 to $12.18 per share, earnings on equity decreased from the 19.8% of 1972. This decline occurred because the gain in earnings was not commensurate with the increase in shareholders' investment. We had forecast in last year's report that such a decline was likely. Unfortunately, our forecast proved to be correct. Our textile, banking, and most insurance operations had good years, but certain segments of the insurance business turned in poor results. Overall, our insurance business continues to be a most attractive area in which to employ capital. Management'...

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《Becoming Steve Jobs》Chapter 17 “Just Tell Them I’m Being an Asshole”

For several months, I had been working to set up a joint interview of Steve, Andy Grove, Bill Gates, and Michael Dell. The confab was supposed to kick off the reporting for a book I had in mind. I had what I thought was a snappy title—Founders Keepers—and a plan to describe how a handful of geeky entrepreneurs had evolved into captains of industry; how self-absorbed inventors morphed into self-taught empire builders; how shaggy-haired idealists managed to stay in the saddle even as the companies they created grew rapidly by orders of magnitude, and as their own wealth and influence over the world itself became far more than the stuff of dreams. 好可惜啊，这次采访没有成形 During this time, Steve came to visit me in the hospital a couple of times. I was so addled with sedatives and painkillers and my own delirious hallucinations that during one visit I expressed my sincerest regrets at not being able to play saxophone in a Beatles retrospective show he was planning to put on in Las Vegas with Ringo S...

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