3d

Grouping bar3 plots like bar

由 白昼怎懂夜的黑 提交于 2020-01-25 07:05:34
问题 I'm wondering if it is possible to get the same grouping behavior of bar plots into bar3 . For example, if you plot bar(rand(3)); you get 3 bars for each point; bar groups the different y values for each x . Now I would like to do the same with a 3D data. That is that I have several slices of 2D data that I want to visualize as groups of bars. Then, if my data is data = rand(3,3,2); I would like to see data(1,1,:) as a group of bars, and data(1,2,:) as another group and so on. Is it possible?

css3 2d/3d变换重点属性详解

由 为君一笑 提交于 2020-01-25 03:38:54
css3 2d/3d变换——实现超炫的特效 声明：所有结论都是经过实际代码运行的效果证实的，如果有不同的情况发生，请核对浏览器版本以及内核（360浏览器，webkit内核）是否与本人试验的时候一致，同时非常感觉读者阅读本文，如有错误之处，欢迎大家留言指出。 css3的2d/3d变换是一个很强大的功能，以前想要做到图片的倾斜或者旋转某个角度，都无法简单的做到，更别说3d效果的实现，这里的3d效果其实也是一种2d变换之后给人的一种视觉欺骗达到的，浏览器这个“平面”客户端确实无法做到真正的3d效果，现在css3就给我们提供了一种简单的方法来做到2d/3d效果。下面我给大家分享一下我的学习心得。 一、坐标轴和参考点（旋转基点） 1、参考点（旋转基点） 相信大家对于参考点这个概念并不会陌生，见名知意的一个词语，css的参考点就是元素所围绕其旋转的点，在css中用一个属性设置旋转基点，如下所示： transform-origin: left top; // 设置该元素的旋转基点为该元素的左上角 transform-origin 属性是css变换的一个重要的属性，一般需要设置2个值： 第一个值为偏移x轴方向的距离，可以用关键字left|right|center或者百分比以及具体的距离值描述。 第二个值为偏移y轴方向的距离，可以用关键字top|bottom

How do I determine whether a 3-dimensional vector is contained within the acute region formed by three other vectors?

由 孤街醉人 提交于 2020-01-24 22:07:54
问题 I'm working on a project in C# where I have three vectors in R3, and I need to find out if a third vector is contained within the region formed by those vectors. The three basis vectors have a maximum angle of 90 degrees between any two of them, and they are all normalized on the unit sphere. They can be negative. So far, I've tried matrix-vector multiplication to find the transformed coordinates of the vector. From there, I check whether all three components are positive. This method works

How do I determine whether a 3-dimensional vector is contained within the acute region formed by three other vectors?

由 青春壹個敷衍的年華 提交于 2020-01-24 22:07:33
问题 I'm working on a project in C# where I have three vectors in R3, and I need to find out if a third vector is contained within the region formed by those vectors. The three basis vectors have a maximum angle of 90 degrees between any two of them, and they are all normalized on the unit sphere. They can be negative. So far, I've tried matrix-vector multiplication to find the transformed coordinates of the vector. From there, I check whether all three components are positive. This method works

How do I take a 3d dimensional array and convert it into a model?

由 痞子三分冷 提交于 2020-01-24 14:25:08
问题 I'm using Open CV and I'm able to extract multidimensional data from and image with my codes but what would be an easy way to display it? I have a 3D array: line start [x] [y] [z] line end [x] [y] [z] Anything in between the lines will be filled with a solid flat surface. Is there some kind of function I can use to easily display a 3d image given these points or whatever other points I'm missing? Such as this pseudo code: display_3d(x,y,z,angle) Any help is highly appreciated. Also I'm using

OpenCV 3D Mat to Vector

由 二次信任 提交于 2020-01-24 12:53:52
问题 I have 3D Mat and would like to convert it to Vector. I tried opencv's reshape() function but it seems to not work with matrices that have dimensions more than 2. How can I convert to 3D Mat to Vector ? I can do it by accessing all elements in the Mat. Is there any efficient way? 回答1: If we have the following 3D matrix: const int ROWS=2, COLS=3, PLANES=4; int dims[3] = {ROWS, COLS, PLANES}; cv::Mat m = cv::Mat(3, dims, CV_32SC1); // works with other types (e.g. float, double,...) This only

从0开发3D引擎（八）：准备“搭建引擎雏形”

由 こ雲淡風輕ζ 提交于 2020-01-24 12:04:44
大家好，现在开始本系列的第三部分，按照以下几个步骤来搭建引擎雏形： 1、分析引擎的需求 2、实现最小的3D程序 3、从中提炼引擎原型 4、一步一步地对引擎进行改进，使其具备良好的架构 5、实现与架构相关的功能，如“多线程渲染”、“延迟渲染”等功能 本文进行第一步，分析引擎的需求。 上一篇博文 从0开发3D引擎（七）：学习Reason语言 业务目标 1.手把手教读者如何从0开发3D引擎 2.学习函数式编程及其在3D领域的应用 3.学习3D编程中基础的功能实现，如纹理、光照、模型等 4.学习引擎的设计和架构，如Data Oriented、多线程等 本系列开发的引擎属于最简化的引擎，读者可以根据自己的需要在此基础上对引擎进行扩充，满足自己的应用场景。 范围 简单渲染 引擎只有最基础的光照和纹理功能。 简单交互 引擎只能通过“操作相机”来交互。 适当的扩展 引擎支持主要的扩展方式，如使用脚本组件来插入用户逻辑，实现动态场景。 Feature 最小功能 完全函数式的架构 支持良好的扩展性 优秀的性能 上下文 开发者 开发者是直接使用引擎来开发Web 3D应用的程序员。 编辑器 编辑器属于对引擎的二次开发。它对引擎进行封装，以“所见即所得”的方式向用户提供对Web 3D场景编辑的界面，从而使用户可以很方便地开发Web 3D应用。 功能性需求 GameObject和Component

Detect overlapping of rectangular prisms

由 空扰寡人 提交于 2020-01-24 04:56:25
问题 Given a 3D coordinate system and rectangular prisms with a non-negative starting point and a non-negative size (e.g. starts at (0, 2, 5) and has a size of (9, 20, 5) ): how can I best check if another rectangular prism intersects with one of the prisms already in the coordinate system? Eventually, the goal would be to perform this check for all prisms present, being able to test one should be sufficient to complete this task. Info: starting points and sizes are 3-tuples of non-negative longs.

How to update opengl modelview matrix with my own 4x4 matrix?

由 二次信任 提交于 2020-01-24 02:41:11
问题 I have 4x4 matrix for object's transformations. float mat44[16]; But i don't know how to update OpenGL ModelView matrix using my matrix. should i use glTranslatef()/glRotatef() with relavant values from my matrix or should i use glLoadMatrix(),glMultMatrix() ? Pls help. Thanks. 回答1: If you want to apply your transformation to current transformation already in OpenGL matrix stack, then you should write: glMultMatrixf(mat44); But if you want to discard what's currently on top of OpenGL matrix

How to convert 3D models to SVG line art?

由 送分小仙女□ 提交于 2020-01-24 01:09:14
问题 I often work with 3D CAD models, which I receive as SolidWorks or PDF files. I need to turn them into black & white line art, like you'd find in a patent application. (In fact, exactly like what you find in a patent application!) Acrobat-9 allows me to rotate & scale the models, so I can print them with reasonable resolution, but the rest of my drawing toolchain deals with SVG files, while all I can get out of Acrobat is bitmaps. (I also make models from scratch in Blender, and make line
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