如何在Opengl中使用gluUnProject draw 3D [英] How to use gluUnProject draw 3D with Opengl

问题描述

似乎没有人理解我的代码.
抱歉，因为我发布了新问题，而之前没有人回答过这个问题
我已经阅读了有关gluUnProject Nehe第13课的内容，但我不明白.
giatuan询问了OpenGL中的鼠标.
Z深度是吗?
我知道Z指向屏幕对着我
如何获得Z值鼠标?
假设我画了三个轴x，y，z
我的目的是在3D中绘制多边形
帮助我

nobody seems to understand my code.
sorry, because I post new questions while no one has answered the question before
I have read about gluUnProject Nehe lession 13 but I do not understand.
giatuan asked about the mouse in OpenGL.
Is Z depth?
I understand Z points out of the screen towards me
How can I get value Z mouse?
suppose I drew three axes x, y, z
My purpose is to draw polygon in 3D
help me

推荐答案

看看是否对您有帮助-Googled
http://www.idevgames.com/forums/thread-6400.html [ ^ ]

检查此代码-

http://nehe.gamedev.net/data/articles/article.asp?article=13 [^ ]

我正在从该链接复制所需的代码，正在转换鼠标(X，Y)
指向空间(X，Y，Z)GL坐标-

CVector3 GetOGLPos(int x，int y)
{
GLint视口[4];
GLdouble modelview [16];
GLdouble投影[16];
GLfloat winX，winY，winZ;
GLdouble posX，posY，posZ;
glGetDoublev(GL_MODELVIEW_MATRIX，modelview);
glGetDoublev(GL_PROJECTION_MATRIX，projection);
glGetIntegerv(GL_VIEWPORT，viewport);
winX =(float)x;
winY =(float)viewport [3]-(float)y;
glReadPixels(x，int(winY)，1，1，GL_DEPTH_COMPONENT，GL_FLOAT，& winZ);
gluUnProject(winX，winY，winZ，模型视图，投影，视口，& posX，& posY，&pos;);
返回CVector3(posX，posY，posZ);
}

希望这对您有帮助...

See if this helps you - Googled
http://www.idevgames.com/forums/thread-6400.html[^]

Check this for code -

http://nehe.gamedev.net/data/articles/article.asp?article=13[^]

I am copying the code from that link what you need, you are converting mouse (X,Y)
points to a space(X,Y,Z) GL coordinates -

CVector3 GetOGLPos(int x, int y)
{
GLint viewport[4];
GLdouble modelview[16];
GLdouble projection[16];
GLfloat winX, winY, winZ;
GLdouble posX, posY, posZ;
glGetDoublev( GL_MODELVIEW_MATRIX, modelview );
glGetDoublev( GL_PROJECTION_MATRIX, projection );
glGetIntegerv( GL_VIEWPORT, viewport );
winX = (float)x;
winY = (float)viewport[3] - (float)y;
glReadPixels( x, int(winY), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ );
gluUnProject( winX, winY, winZ, modelview, projection, viewport, &posX, &posY, &posZ);
return CVector3(posX, posY, posZ);
}

Hope this helps...

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