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我使用從訥河教程這段代碼的座標點擊鼠標MFC使用OpenGL得到二維三維座標在我的MFC基於應用鼠標
void CRightOGL::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
GLint viewport[4];
GLdouble modelview[16]={0};
GLdouble projection[16];
GLfloat winX, winY, winZ;
GLdouble posX, posY, posZ;
GLfloat mv[16];
glGetFloatv(GL_MODELVIEW_MATRIX, mv);
glGetDoublev(GL_MODELVIEW_MATRIX, modelview);
glGetDoublev(GL_PROJECTION_MATRIX, projection);
glGetIntegerv(GL_VIEWPORT, viewport);
winX = (float)point.x;
winY = (float)viewport[3] - (float)point.y;
glReadPixels(point.x, int(winY), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ);
gluUnProject(winX, winY, winZ, modelview, projection, viewport, &posX, &posY, &posZ);
COpenGLControl::OnLButtonDown(nFlags, point);
}
但問題是,我每次都得到不正確的值POSX, & posY,& posZ ...值總是在-9.25555,-9.255555,-9.255555。不僅如此,而且modelview矩陣每次都返回相同的-9.555值。
如果我把所有東西初始化爲0,那麼posX,posY和PosZ只返回0而不是正確的座標。鼠標的x和y值非常好,所以從鼠標方面來說沒有問題。
我在做什麼錯了?
我的OpenGL初始化代碼如下
void COpenGLControl::oglInitialize(void)
{
// Initial Setup:
//
static PIXELFORMATDESCRIPTOR pfd =
{
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
32, // bit depth
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
16, // z-buffer depth
0, 0, 0, 0, 0, 0, 0,
};
// Get device context only once.
hdc = GetDC()->m_hDC;
// Pixel format.
m_nPixelFormat = ChoosePixelFormat(hdc, &pfd);
SetPixelFormat(hdc, m_nPixelFormat, &pfd);
// Create the OpenGL Rendering Context.
hrc = wglCreateContext(hdc);
wglMakeCurrent(hdc, hrc);
// Basic Setup:
//
// Set color to use when clearing the background.
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
// Turn on backface culling
glFrontFace(GL_CCW);
glCullFace(GL_BACK);
// Turn on depth testing
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH);
//glEnable(GL_TEXTURE_2D); // Enable 2D textures
// Send draw request
GLenum a = glGetError();
OnDraw(NULL);
}
你把代碼之間嗎? – manatttta