opengl render problem about changing view?

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In my code, I have two different render functions.

I want to use different render function to display different view.
The problem is when I run the program and change the view function, the second render function also display the object that the first render function draw.

But in the second render function I don't call the first render function.

If I then change to the first render function, it also display the object that second render function draw. I don't know why.

I think it may be not clear the frame buffer, I use

MIDL

glEnable(GL_DEPTH_TEST);       
glClearColor(0.6f,0.6f,0.6f,0.0f);               
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

to clear buffer, the problem still exist.
my English is not good, please forgive me.

Posted 6-Oct-10 22:06pm

thundersun

Updated 6-Oct-10 22:34pm

Dalek Dave

v2

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Dalek Dave 7-Oct-10 4:34am

Minor Edit for Readability.

2 solutions

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chrisyeshi · Answer 1 · 2010-10-07T10:51:00

Solution 1

Every time before you render something to the screen, you need to clear the screen first. Otherwise the existing contents in the screen remains.

Posted 7-Oct-10 10:51am

chrisyeshi

Comments

thundersun 7-Oct-10 21:23pm

You mean that "glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);" can not clear the screen. what function can clear the screen? can you tell me?

chrisyeshi · Answer 2 · 2010-10-07T15:43:00

Solution 2

MIDL

"glClearColor(0.6f,0.6f,0.6f,0.0f);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);"

These 2 lines should be what you need to clear the screen.
I don't know what your codes are, so I can't tell much about it.
Are you sure you are running the above 2 lines before the second render function?
And, did you try glClearColor(0.6, 0.6, 0.6, 1.0);?

Posted 7-Oct-10 15:43pm

chrisyeshi

Updated 7-Oct-10 15:46pm

v2

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thundersun 8-Oct-10 7:10am

Yes,I try "glClearColor(0.6f,0.6f,0.6f,0.0f);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);" 2 lines,but it does not work. The objects which the first render function displays still appear.