FAQ/Depth Buffer: Difference between revisions

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; [[Enable Depth Buffering]] : How do I make depth buffering work?
== Enabling depth buffering ==
 
In order to use depth buffering, the following must occur:.
 
* The current framebuffer, whether an [[Framebuffer Object|FBO]] or the [[Default Framebuffer|default framebuffer]], must have a depth buffer.
* Depth testing must be enabled. This is done by calling {{code|glEnable(GL_DEPTH_TEST)}}.
* The depth range zNear and zFar must be set properly. Use {{code|glDepthRange}} to set these values.
* The depth buffer must be cleared when appropriate. This can be done by using glClear with the GL_DEPTH_BUFFER_BIT (along with glClearDepth to set the value that it will be cleared to). glClearBuffer can also be used to clear specific buffers.
 
== Depth buffer precision ==
{{main|Depth Buffer Precision}}
 
; [[Depth Buffer and Perspective Rendering]] : Depth buffering doesn't work in my perspective rendering. What's going on?
; [[Depth Buffer and Perspective Rendering]] : Depth buffering doesn't work in my perspective rendering. What's going on?
; [[Write Image To Depth Buffer]] : How do I write a previously stored depth image to the depth buffer?
; Write Image To Depth Buffer : How do I write a previously stored depth image to the depth buffer?
; [[Depth Buffer Precision]] : Depth buffering seems to work, but polygons seem to bleed through polygons that are in front of them. What's going on?
: Why is my depth buffer precision so poor?
: Why is there more precision at the front of the depth buffer?
: There is no way that a standard-sized depth buffer will have enough precision for my astronomically large scene. What are my options?
; How do I turn off the zNear clipping plane? : See [http://www.opengl.org/resources/faq/technical/clipping.htm#0050 this question] in the Clipping section.
; How do I turn off the zNear clipping plane? : See [http://www.opengl.org/resources/faq/technical/clipping.htm#0050 this question] in the Clipping section.
; An article about depth buffer precision http://www.sjbaker.org/steve/omniv/love_your_z_buffer.html
; An article about depth buffer precision http://www.sjbaker.org/steve/omniv/love_your_z_buffer.html


{{stub}}


[[Category:Framebuffer]]
[[Category:Framebuffer]]
[[Category:Depth Buffering]]

Revision as of 08:32, 11 April 2011

Enabling depth buffering

In order to use depth buffering, the following must occur:.

  • The current framebuffer, whether an FBO or the default framebuffer, must have a depth buffer.
  • Depth testing must be enabled. This is done by calling glEnable(GL_DEPTH_TEST).
  • The depth range zNear and zFar must be set properly. Use glDepthRange to set these values.
  • The depth buffer must be cleared when appropriate. This can be done by using glClear with the GL_DEPTH_BUFFER_BIT (along with glClearDepth to set the value that it will be cleared to). glClearBuffer can also be used to clear specific buffers.

Depth buffer precision

Main article: Depth Buffer Precision
Depth Buffer and Perspective Rendering
Depth buffering doesn't work in my perspective rendering. What's going on?
Write Image To Depth Buffer
How do I write a previously stored depth image to the depth buffer?
How do I turn off the zNear clipping plane?
See this question in the Clipping section.
An article about depth buffer precision http://www.sjbaker.org/steve/omniv/love_your_z_buffer.html
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