OpenGL ES-从摄影机位置获取2D像素坐标 [英] OpenGL ES - get 2D pixel coordinate from camera position
问题描述
我正在使用OpenGL ES(IOS)和OpenCV.我想知道是否有一种方法可以从GLKMatrix4相机位置获取2D像素坐标吗?
I'm working with OpenGL ES (IOS) and OpenCV. I would like to know if there is a way to get 2D pixel coordinate from a GLKMatrix4 camera position ?
实际上，我使用OpenGL显示了一个特定的3D对象，该对象只有它的大小和它的相机姿势，我想将其转换为OpenCV参考坐标，即2D像素.
Indeed, I have a specific 3D object displayed with OpenGL which has only its size and its camera pose and I would like to convert it into the OpenCV reference Coordinate i.e 2D pixel.
更准确地说，我有一个IOS应用程序，并且可以传输相机颜色.此流与OpenGL一起显示在我的Ipad上.在此显示器上，我有一个特定的叠加层，它是一个3D对象.同时，我对OpenCV进行了一些检测.现在，我要通过3D对象将帧中的OpenCV(这是一个矩形绘制)与我的检测结果联系起来，但是对于这个对象，我只有其摄像机位置和大小.
More precisely, I have an IOS app and I stream the camera color. This stream is displayed with OpenGL on my Ipad. On this display, I have a specific overlay which is a 3D object. At the same time, I do some some detection with OpenCV. Now, I would like to link the result of my detection thank to OpenCV in my frame (It's a rectangle draw) with the 3D object but for this one, I have only its camera position and its size.
我知道4x4摄像头姿势的内容，但是没有找到有关如何将其转换为2D坐标的任何信息.
I know the content of a 4x4 camera pose but I did not find any information about how I could convert it (if it is possible) to a 2D coordinate.
因此简要地: 输入:2D矩形(仅获取2D坐标)和3D对象(仅获取其相机位置)
So briefly : Input : A 2D rectangle (get only 2D coordinate) and an 3D object (get only its camera position)
有办法吗?你能帮我吗?
Is there a way ? Could you please help me ?
谢谢
推荐答案
由于您已经在使用GLKit类型和数学，请尝试使用函数 GLKMathUnproject (如果您还需要其他方法).您将需要(假定)传递给着色器的(相同)模型视图和投影矩阵，以绘制场景.
Since you're already using GLKit types and math, try the function GLKMathProject to convert from 3D model space to viewport (window/pixel 2D) space, and GLKMathUnproject if you also need the other way around. You'll need the (same) modelview and projection matrices that you're (presumably) passing to a shader for drawing your scene.
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