Z Buffer Support
Revolt Game No Z Buffer Fighting Simulator

Depth buffering seems to work, but polygons seem to bleed through polygons that are in front of them. What's going on?

You may have configured your zNear and zFar clipping planes in a way that severely limits your depth buffer precision. Generally, this is caused by a zNear clipping plane value that's too close to 0.0. As the zNear clipping plane is set increasingly closer to 0.0, the effective precision of the depth buffer decreases dramatically. Moving the zFar clipping plane further away from the eye always has a negative impact on depth buffer precision, but it's not one as dramatic as moving the zNear clipping plane.

Nov 28, 2012 Anyway, my PC is struggling with Z-buffer fighting in many of the video games that I play. From wiki: 'Z-fighting is a phenomenon in 3D rendering that occurs when two or more primitives have similar values in the z-buffer.' The resulting effect is a very annoying flicker caused by the two polygons 'fighting' to be displayed.

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Beetle-PSX does not really have z-buffer. What you see on video is an 'experimental Z-buffer' that never got released. And the best I got right now debugging through it is this (Resident Evil, lol). So no, no depth buffer for Ps1, until iCatButler decides to implement one (that was never present in the original hardware, btw) EDIT: same for.
Beetle-PSX does not really have z-buffer. What you see on video is an 'experimental Z-buffer' that never got released. And the best I got right now debugging through it is this (Resident Evil, lol). So no, no depth buffer for Ps1, until iCatButler decides to implement one (that was never present in the original hardware, btw) EDIT: same for.

The OpenGL Reference Manual description for glFrustum() relates depth precision to the zNear and zFar clipping planes by saying that roughly ${displaystyle log _{2}{tfrac {zFar}{zNear}}}$ bits of precision are lost. Clearly, as zNear approaches zero, this equation approaches infinity.

While the blue book description is good at pointing out the relationship, it's somewhat inaccurate. As the ratio (zFar/zNear) increases, less precision is available near the back of the depth buffer and more precision is available close to the front of the depth buffer. So primitives are more likely to interact in Z if they are further from the viewer.

It's possible that you simply don't have enough precision in your depth buffer to render your scene. See the last question in this section for more info.

It's also possible that you are drawing coplanar primitives. Round-off errors or differences in rasterization typically create 'Z fighting' for coplanar primitives. Here are some Drawing Lines over Polygons.

Why is my depth buffer precision so poor?

The depth buffer precision in eye coordinates is strongly affected by the ratio of zFar to zNear, the zFar clipping plane, and how far an object is from the zNear clipping plane.

You need to do whatever you can to push the zNear clipping plane out and pull the zFar plane in as much as possible.

To be more specific, consider the transformation of depth from eye coordinates

${displaystyle x_{e},y_{e},z_{e},w_{e}}$

to window coordinates

${displaystyle x_{w},y_{w},z_{w}}$

with a perspective projection matrix specified by

Solidworks 2005 torrent crack files. and assume the default viewport transform. The clip coordinates of ${displaystyle z_{c}}$ and ${displaystyle w_{c}}$ are

${displaystyle {begin{aligned}z_{c}&=-z_{e}{dfrac {f+n}{f-n}}-w_{e}{dfrac {2*f*n}{f-n}}w_{c}&=-z_{e}end{aligned}}}$

Why the negations? OpenGL wants to present to the programmer a right-handed coordinate system before projection and left-handed coordinate system after projection.

and the ndc coordinate:

${displaystyle {begin{aligned}z_{ndc}&={dfrac {z_{c}}{w_{c}}}&=-z_{e}{dfrac {f+n}{f-n}}-w_{e}{dfrac {2*f*n}{f-n}}&={dfrac {f+n}{f-n}}+{dfrac {2*f*n*w_{e}}{z_{e}(f-n)}}end{aligned}}}$

Revolt Game No Z Buffer Fighting