Can't properly save QChartView as image when using QLineSeries with openGL on
来源： https://stackoverflow.com/questions/48139716/cant-properly-save-qchartview-as-image-when-using-qlineseries-with-opengl-on
opengl
Compiling OpenGL and GLUT OSX
问题 I am having difficulty compiling a C program using the OpenGL and GLUT frameworks on Mac OSX. I am just getting started and I attempted to run code from this tutorial, on how to install OpenGL. http://www.prinmath.com/csci5229/misc/install.html. Here is the code: #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/glut.h> #endif int main(){ return 0; } I am trying to compile it with: gcc -o foo foo.c -framework GLUT -framework OpenGL I am receiving this error: foo.c:2:23: error: GLUT
Compiling OpenGL and GLUT OSX
问题 I am having difficulty compiling a C program using the OpenGL and GLUT frameworks on Mac OSX. I am just getting started and I attempted to run code from this tutorial, on how to install OpenGL. http://www.prinmath.com/csci5229/misc/install.html. Here is the code: #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/glut.h> #endif int main(){ return 0; } I am trying to compile it with: gcc -o foo foo.c -framework GLUT -framework OpenGL I am receiving this error: foo.c:2:23: error: GLUT
How to texture of a glutSolidTorus in OpenGL? [closed]
问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Improve this question I am trying to texture a glutSolidTorus() . Here is my code: glColor3f(1.0f, 1.0f, 1.0f); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, tiring); glutSolidTorus(.55, 1.8, 25, 25); glDisable(GL_TEXTURE_2D); But it does not work. How can I texture glutSolidTorus() ? 回答1:
4 Element Vector (3D Math)
问题 Why is there a W term in a lot of 3D API's Vector class (i.e. Vector4(x, y, z, w) ) ? Are there math operations that absolutely require the W term? 回答1: This is a special representation of a point in 3D space, called homogeneous coordinates . They are just another way to describe a point in 3D space. They are used a lot in 3D graphics because they have a few advantages: they make some formulas simpler, and they allow you to represent a "point at infinity" (or "line at infinity" etc. depending
Qt3D geometry shader working in QML but not in C++
问题 Update The OpenGL version seems to be 4.3 at least according to the following code QSurfaceFormat format = view.format(); int major = format.majorVersion(); int minor = format.minorVersion(); so geometry shaders should work and the issue seems to be something else. Original Question While trying to answer this question related to how to create billboards in Qt3D I encountered an issue I found no solution for. I used the code from this GitHub repository which contains C++ and QML. It works
Qt音视频开发11-ffmpeg常用命令
一、前言 大部分的格式转换工具比如格式化工厂等，都用到了ffmpeg来处理，ffmpeg编译后生成的ffmpeg.exe、ffplay.exe、ffprobe.exe等可执行文件，其实就封装了众多牛逼的功能，ffprobe查看媒体文件头信息的工具，ffplay用于播放媒体文件的工具，尤其是ffmpeg.exe，强大的媒体文件转换工具，可以转换任何媒体文件，还可以用自己的 AudioFilter 以及 VideoFliter 进行处理和编辑，比如下面的一些功能。 列出支持的格式：ffmpeg -formats 剪切一段媒体文件：ffmpeg -i input.mp4 -ss 00:00:50.0 -codec copy -t 20 output.mp4 提取一个视频文件中的音频文件：ffmpeg -i input.mp4 -vn -acodec copy output.m4a 视频静音，即只保留视频：ffmpeg -i input.mp4 -an -vcodec copy output.mp4 从MP4文件中抽取视频流导出为裸的H264数据：ffmpeg -i output.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb output.h264 使用AAC音频数据和H264视频生成MP4文件：ffmpeg -i test.aac -i
GLUT Tutorials 17：子窗口
博客转自： http://www.lighthouse3d.com/tutorials/glut-tutorial/subwindows/ 创建和销毁子窗口 With GLUT we can define subwindows, i.e. divide the main window in different regions, each with its own OpenGL context and callbacks. One possible application is to provide several views of the same scene simultaneously. In order to create a subwindow we use the function glutCreateSubWindow with the following syntax: int glutCreateSubWindow( int parentWindow, int x, int y, int width, int height); Parameters: parentwindow – the id of the parent window x, y – the top left corner of the subwindow, relative to the
OpenCV开发笔记（六十六）：红胖子8分钟带你总结形态学操作-膨胀、腐蚀、开运算、闭运算、梯度、顶帽、黑帽（图文并茂+浅显易懂+程序源码）
若该文为原创文章，未经允许不得转载 原博主博客地址： https://blog.csdn.net/qq21497936 原博主博客导航： https://blog.csdn.net/qq21497936/article/details/102478062 本文章博客地址： https://blog.csdn.net/qq21497936/article/details/107106565 红胖子(红模仿)的博文大全：开发技术集合（包含Qt实用技术、树莓派、三维、OpenCV、OpenGL、ffmpeg、OSG、单片机、软硬结合等等）持续更新中…（点击传送门） Qt开发专栏：项目实战（点击传送门） OpenCV开发专栏（点击传送门） 上一篇：《 OpenCV开发笔记（六十五）：红胖子8分钟带你深入了解ORB特征点（图文并茂+浅显易懂+程序源码） 》 下一篇：持续补充中… <br> 前言 红胖子，来也！ opencv之前讲解了各种形态学操作，使用了形态学对应的函数，除此之外，opencv在形态学上还提供了专门的函数处理，一个函数搞定所有，当然就不能实现自定义的一些算法，如3次膨胀，2次腐蚀了（之前的开、闭运算demo提供了这种操作）。 <br> Demo Q 形态学 图像处理中的形态学，指数字形态学。 数学形态学是数学形态学图像处理的基本理论
学习Python
初次接触Python Python 解释器、安装解释器、从Print开始、编写执行代码工具 编译执行与解释执行 编译执行需要编译链接产生机器代码，再由CPU进行读取 Python不需要编译机器代码，用解释器（代码转换器转换成bytecode文件后由Python虚拟机pump执行）进行解释执行 CPU是两者的物质基础 Python 解释器种类 cpython-c Jpython-java IronPython-.net 不同操作平台（Linux、Windows、Unix、Mac OS等，x86-PC 笔记本、平板、手机、ARM平板、手机等）都能运行同样的Python 脚本（但有些平台相关性的代码不能跨平台） 从Print开始 输出字符串到控制台窗口/写代码文件 语句（statement）:完成一个完整的语义的最小单元，可能是一行也可能是多行，程序的代码就是由语句组成。 print关键字:关键字是语言保留的表示特殊意义的标识字符串，不可以重新定义 Python 是大小写敏感的语言(区分大小写）Python代码在文件中必须：1、第一行语句顶到最左边，不能有空格；2、第一行语句前面可以有空行、不同语句行首要对齐。 交互式命令行执行：直接在命令窗口输入命令 代码编辑工具：IDLE/notepad++/pycharm 注：Python语言解释器由C++语言实现