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## 方案页面 | ||
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- 2024-7-25 游离根 跟着 颌骨显示 | ||
### CT | ||
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- 大平台通过一个接口来显示控制 | ||
- 企业版,返回字段有rootBone就显示 | ||
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## 快速目标位 | ||
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# Night Guard | ||
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Night Guard可以治疗磨牙、下巴不适、头痛和睡眠问题等特定疾病。 | ||
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Night Guard是一种口腔保护器,可以覆盖牙齿的咬合表面。Night Guard是它最常使用的名称,还可以称作护齿器、咬合护罩、咬合夹板、牙科护齿器、夜间咬合板等。 | ||
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Night Guard通常分上颌和下颌,具体使用哪款,取决于患者病情的严重程度。 | ||
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## 种类 | ||
颞下颌关节疾病(连接颌骨和颅骨的滑动铰链功能障碍)的患者需要硬质的Night Guard。它们由一种非柔韧的刚性丙烯酸材料热成型,可将夹板保持在适当的位置,并将牙齿保持在正确的位置。坚固的夜间防护装置为最严重的牙齿咬牙和磨牙症提供保护。 | ||
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柔软的Night Guard是大多数轻微的咬牙和磨牙症病例的最佳选择。它们佩戴舒适,可有效治疗下巴疼痛、酸痛和头痛等疾病。 | ||
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## 功能 | ||
Night Guard是修复的关键 | ||
修复体是复杂而昂贵的程序,对牙齿健康至关重要。Night Guard确保这项工作是持久的,防止了治疗后期的不良趋势,并减少了随着时间的推移进行修复的需要。对患者的好处是,Night Guard是他们护理的一种具有成本效益的预防性补充。 | ||
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Night Guard是一种多用途工具 | ||
Night Guard可以帮助缓解许多健康问题,包括睡眠困难、偏头痛、头痛、下巴疼痛问题和夜间充血。咬牙和磨牙通常是这些疾病背后的罪魁祸首, 而Night Guard可以产生显着影响,从而显着改善舒适度和整体健康状况。 | ||
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## 权衡 | ||
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在材料方面,牙医了解并熟悉软、硬两种质地,质地的选择伴随着不可避免的权衡。与硬质Night Guard相比,软质Night Guard更舒适,但不能有效承受力,并且更需要更换。但软质的柔韧会让患者更倾向握紧和咀嚼。 | ||
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# Light灯光 | ||
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## PointLight | ||
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PointLight是一种从特定点向所有方向发射光线的光源类型,类似于现实生活中的白炽灯 | ||
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点光源的数学原理主要涉及到光线的发射、衰减以及对场景中物体的照明效果 | ||
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点光源的数学模型通常基于光的发射和衰减原理,其中光线的衰减可以通过反平方定律(inverse square law)来描述,即光的强度与距离的平方成反比。 | ||
- 距离(distance):点光源有一个影响范围,即distance属性,它定义了点光源可以照射多远。如果物体距离点光源超过这个距离,将不会受到点光源的影响 | ||
- 衰减(decay):点光源的衰减属性定义了光线随着距离增加而减弱的速率。衰减度的值可以设置为1或2,其中2可以模拟现实中的光照衰减效果 | ||
- 阴影(shadows):点光源可以产生阴影,为场景中的物体增加逼真的阴影效果。要启用点光源的阴影功能,需要将castShadow属性设置为true,并为场景中的接收阴影的物体设置receiveShadow属性为true |
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# 数据加载 | ||
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## 导入 | ||
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- Loader | ||
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相对路径为src\loaders\Loader.js,LoadingManager两个类管理封装了基础接口 | ||
继承的加载器需要实现两个接口,一个是请求,一个是解析 | ||
```js | ||
XXXLoader extends Loader { | ||
load(url, onLoad, onProgress, onError) { | ||
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} | ||
parse(data) { | ||
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} | ||
} | ||
``` | ||
LoadingManager是一个独立封装的,类似一个函数,全部在constructor中实现,至少用了class的语法 | ||
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## 导出 | ||
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### JSON | ||
导出当前内存的对象为JSON文件 | ||
```js | ||
/** | ||
* 使用方法,传入 | ||
* str JSON.stringify(scene.toJSON()) | ||
*/ | ||
(function(str, type, filename){ | ||
const encode = new TextEncoder(); | ||
const blob = new Blob([encode.encode(str)]); | ||
const url = window.URL.createObjectURL(blob, {type: type || 'application/octet-stream'}); | ||
const tagA = document.createElement('a'); | ||
tagA.href = url; | ||
tagA.download = filename || 'raw.dat'; | ||
tagA.click(); | ||
window.URL.revokeObjectURL(url); | ||
})(); | ||
``` | ||
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# Camera | ||
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## 插值 | ||
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要实现缩放动画并应用插值,修改camera的以下属性值,并逐步更新这些值就形成了动画的缩放 | ||
- fov(视场角,对于透视相机 | ||
- zoom(缩放级别,对于正交相机)属性 | ||
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- Zooming and changing the FOV is the same thing, but they are very different to getting near/far. | ||
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## dolly zoom | ||
What is the dolly zoom? Also known as the contra zoom or Vertigo shot (as it was first used to magnificent effect by Alfred Hitchcock in his 1958 thriller film Vertigo), the dolly zoom is a camera movement that's quick yet effective at disorienting viewers. | ||
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Dolly-Zoom,也被称为“Vertigo effect”或“zolly”,是一种电影拍摄技巧,通过同时进行推拉镜头和改变镜头焦距来保持画面中主体的尺寸不变,从而在背景上产生一种扭曲的视觉效果,这种效果可以创造出一种令人迷惑的感觉。这种技术经常被用来在视觉上表现角色的心理状态,比如突然的领悟、震惊或恐惧感 | ||
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Dolly-Zoom一般分为两种类型: | ||
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- 外退内进(Dolly-out & Zoom-in):摄像机往后退,同时焦距往前进,使得背景看起来逐渐变大,而主体大小保持不变。 | ||
- 外进内退(Dolly-in & Zoom-out):摄像机往前进,同时焦距往后退,使得背景看起来逐渐变小,同样主体大小保持不变。 | ||
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实现Dolly-Zoom效果,需要保存开始缩放时物体位置处的frustum高度,然后随着相机的移动,找到新的距离,并调整FOV以保持物体在物体位置处的相同高度,这样就可以实现Dolly-Zoom效果 | ||
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## 参考 | ||
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- [The Dolly Zoom Effect, Explained (And 7 Examples in Movies)](https://whatnerd.com/contra-zoom-film-technique-explained-examples/) |
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# Book-Info | ||
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- [物理科学和技术中使用的数学符号](https://std.samr.gov.cn/gb/search/gbDetailed?id=71F772D812E4D3A7E05397BE0A0AB82A) | ||
- [pdf](https://journal.cricaas.com.cn/attached/file/20210517/20210517161953_566.pdf) | ||
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## 线性代数 | ||
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- [Serge Lang《linear algebra》](https://book.douban.com/subject/2314300/) | ||
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## 分析 | ||
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- [Walter Rudin《Principles of Mathematical Analysis》(数学分析原理)](https://book.douban.com/subject/1230095/) | ||
- 学习数学的学生的必读之作 | ||
- 在谈论实数和复数集时,使用几何语言通常很方便,然而应该清楚理解的是,证明不能基于几何直觉,尽管几何解释可能非常有助于暗示证明可能进行的步骤 | ||
- 大部分文本以定义、示例、定理、证明、推论为顺序,组织非常高效,同时给初学者困惑和迷茫的 | ||
- [Charles Chapman Pugh《Real Mathematical Analysis》(实数学分析)](https://book.douban.com/subject/26588474/) | ||
- 很好的解释了概念或证明的本质,帮助建立直觉 | ||
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## 概率论 | ||
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- [Ross《a First Course in Probability》]() | ||
- 不需要测度论知识,从可数或有限样本空间中来学习概率论 | ||
- [Rick Durrett《Probability: Theory and Examples》]() | ||
- 概率论有左手和右手。左手是使用测度论工具进行的严谨的基础工作。右手‘以概率方式思考’,将问题简化为赌博情况、抛硬币和物理粒子的运动。 |
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## 数学 | ||
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- [相关推荐的书籍](/exercises/book-info.md) | ||
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- [数学](/exercises/math.md) | ||
- [小学数学](/exercises/math.primary.md) | ||
- [初中数学](/exercises/math.secondary.md) | ||
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- [几何](/exercises/geometry.md) | ||
- [线性代数](/exercises/linear.algebra.md) | ||
- [多项式](/exercises/polynomial.md) | ||
- [概率与统计](/exercises/probability.statistics.md) | ||
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## 物理学 | ||
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- [Wolfram MathWorld](https://mathworld.wolfram.com/) | ||
- [提供各种数学问题的交互式解法和动画](https://www.cut-the-knot.org/) | ||
- [图形计算器,用[email protected]登录的](https://www.desmos.com/calculator?lang=zh-CN) | ||
- [math is fun](https://www.mathsisfun.com/) | ||
- [数学乐-中文版](https://www.shuxuele.com/index.html) | ||
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<details> | ||
<summary>Geogebra开源在线工具</summary> | ||
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