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Depth Buffer

Started by FERNANDO-BRASIL Aug 10, 2002 at 9:30 AM 4 replies 500+ views

Original Post

Aug 10, 2002 at 9:30 AM

Hi Guys! I would like to know if there is a way, to indicate OpenGL, that I only want to draw the subsequent operations with the depth Buffer, for example, setted to the maximun depth value possible (1.0f I think)... It''s because I want to draw a Full Screen Image, but I don''t want it overfronting the existents objects in the screen. So, I think I could do it by drawing all my objects, and after it, draw this image, with the depth value greatest thant the other objects. Is it possible? Thank you Fernando

Kamil

Aug 10, 2002 at 9:40 AM

You can do something like this:
disable depthbuffer
draw your image
enable depthbuffer
draw your objects

FERNANDO-BRASIL

Author

FERNANDO-BRASIL

Aug 10, 2002 at 9:45 AM

Thank you Kamil! This is like I'm doing in moment, but I think the drawing could have a best speed rating, If I do it in the opposite way... Do you know if it's possible?

[edited by - FERNANDO-BRASIL on August 10, 2002 10:47:50 AM]

Kamil

Aug 10, 2002 at 9:54 AM

quote:
Original post by FERNANDO-BRASIL
I think the drawing could have a best speed rating, If I do it in the opposite way...
[edited by - FERNANDO-BRASIL on August 10, 2002 10:47:50 AM]

I don''t think so, probably code what turns depthbuffer on/off is faster then code what writes to it (becaues it has to compare values). But I didn''t test that.

FERNANDO-BRASIL

Author

FERNANDO-BRASIL

Aug 10, 2002 at 10:02 AM

Ok! I think I''ll use this way then. Thank you a lot Kamil.

Fernando

_the_phantom_

496

_the_phantom_

Aug 10, 2002 at 10:13 AM

turning off zbuffer writes is ALWAYS going to be faster than filling the zbuffer with a value because your not accessing memory at all with the turn off method

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