OpenGL获取投影矩阵 [英] OpenGL getting projection matrix

问题描述

我试图在OpenGL中使用gluUnProject，首先我需要获取projectoin，model_view和viewort矩阵.根据我在网上找到的示例，我使用

I am trying to use gluUnProject in OpenGL, first I need to get the projectoin, model_view, and viewort matrices. According to examples that I have found online I used

 glGetFloatv(GL_PROJECTION_MATRIX, projection)
 glGetFloatv(GL_MODELVIEW_MATRIX, model_view)
 glGetInteger(GL_VIEWPORT, viewport)

但是我收到错误消息"ValueError:glGetFloatv需要1个参数(pname)，收到2:(GL_PROJECTION_MATRIX，[])"

But I get the error "ValueError: glGetFloatv requires 1 arguments (pname), received 2: (GL_PROJECTION_MATRIX, [])"

那么，我应该用什么来获取这些矩阵?

So, what should I be using to get these matrices?

推荐答案

也许:

projection = glGetFloatv(GL_PROJECTION_MATRIX)
# and so on ...

之后，在projection变量中应为投影矩阵

after that in projection variable should be PROJECTION matrix

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