获取当前 ModelView 矩阵

Obtaining current ModelView matrix(获取当前 ModelView 矩阵)

问题描述

在 OpenGL 中，如何读取模型视图矩阵中的当前 x/y 平移?我知道您必须将当前矩阵加载到一个数组中并从那里读取浮点数，但我不知道具体该怎么做.

In OpenGL, how do I read the current x/y translation in the modelview matrix? I know that you have to load the current matrix into an array and read the floats from there, but I don't know precisely how to do it.

推荐答案

为了检索当前的模型视图矩阵，您必须调用 glGetFloatv 函数，带有 GL_MODELVIEW_MATRIX 参数.

In order to retrieve the current modelview matrix you have to call the glGetFloatv function with GL_MODELVIEW_MATRIX parameter.

GLfloat matrix[16]; 
glGetFloatv (GL_MODELVIEW_MATRIX, matrix); 

来自文档:

GL_MODELVIEW_MATRIX

params 返回十六个值:顶部的模型视图矩阵模型视图矩阵堆栈.最初这矩阵是单位矩阵.

params returns sixteen values: the modelview matrix on the top of the modelview matrix stack. Initially this matrix is the identity matrix.

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