Why the following code did not work?

[lijz]

The following code was used to readthe color and depth of apixel in Pro/E model window by using openGL functions to perfom some simulation. All the other opengl functions worked properly except depth reading. I don't know why. Anybody help me. Thanks a lot.


Now given a model displayed in Pro/E, as shown in this fig. when I tried to run the code, the resultsare shownin the comments.


View attachment 4895


intwinWidth, winHeight;
GLint iViewParams[4];
glGetIntegerv(GL_VIEWPORT, iViewParams);//It works
winWidth= iViewParams[2]-iViewParams[0];
winHeight= iViewParams[3]-iViewParams[1];


BYTEbtRGB[3];
GLfloatfZBuffer[1];


//Lower-left corner


glReadPixels(0, 0, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, btRGB);//It works
glReadPixels(0, 0, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, fZBuffer); //dosn't work properly


//The center of the view


int cw = winWidth/2;
int ch = winHeight/2;
glReadPixels(cw, ch, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, fZBuffer);//dosn't work, always get fZBuffer[0]=1.0 everywhere


Actually the depth of every pixel of the model surface should be different value, but here it kept 1.0 for all pixels. This problem have troubled me for quite a long time. I really appreciate any kind of your help.

 

[williaps]

I am impressed that you are using openGl functions to analyze the pro/E window. If I were you I would ask this question in another forum. This forum focuses on APIs provided by PTC. Good Luck!

 

[lijz]

To williaps,
This is what I have to do in my simulation. The same thing I did with Unigraphics now need to be shifted to proE. The problem is that the code works well in Unigraphics model window but doesn't in proE. So I post this question here and hope somebody could help me.