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Nvidia gpu programming guide

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[color=red]Nvidia gpu programming guide[/color]



Digging through some programming documents on Nvidia’s website I was able to find
something interesting in one quite old document, regarding programming for GeForce 7 series, but these are still mostly
the same issues that bring problems to current games when you try to play them in stereo 3D. I’m citing the part
where Nvidia talks about these common issues and suggests workarounds (in terms of programming the game) for them below,
because you need to be aware of these in order to be able to avoid most of them by changing settings in the game options
etc. If you know what hurts the game looking good in stereo 3D mode you may be able to disable some of the problematic
things or lower their negative impact with lets say custom convergence, so that the game will still be playable and look
nice. And although these are related to Nvidia’s stereoscopic 3D drivers (prior 3D Vision) they do apply to 3D
Vision and other alternative solutions that allow you to play a game in stereo 3D mode…

Rendering at an
Incorrect Depth
This problem is the number one thing you should take care of. The 3D Stereo Driver uses the depth
to create the stereo effect, so anything that is not at the correct depth stands out like a sore thumb when viewed in
Stereo.
- Place background images, sky boxes, and sky domes at the farthest possible depth. Otherwise, the world
will look like it’s in a little box in stereo.
- Place HUD items at their proper 3D depth. If you have name
labels that hover over objects, putting them at the 3D depth of the object gives a better stereo effect than putting
them on the near plane of the view frustum.
- It’s also helpful to render the HUD as far into the scene as
possible. This trick gives you a greater perceived depth in the rest of your scene while not causing eyestrain when
looking at the HUD.
- Laser sights, crosshairs, and cursors do not look correct unless placed in the 3D world at
the depth of the objects they are pointing to. When they aren’t, it is almost impossible to use them since the
user’s eyes are converging on one depth, but the cursor is at another depth; users see two cursors, neither of
which point at the correct place.
- Highlighting objects should happen at the depth of the object itself, not in
screen space.

Billboard Effects
Billboard effects look flat and bad in regular 3D; they look even worse
in stereo. In regular 3D you see the billboards as you move around, but in 3D Stereo the problem immediately pops out at
you, even in a static scene. Most billboard effects look extremely flat in stereo, so use real geometry everywhere you
can instead, even low resolution geometry looks better. For particle effect billboards (sparks, smoke, dust, etc), these
may or may not look ok, the best thing you can do is test your app in stereo to see what it looks like and judge if the
quality is good enough, and make sure that the billboards have a meaningful depth in 3D.

Post-Processing and
Screen-Space Effects
2D screen-space effects can greatly hurt the stereo effect. Things like blurry glow, bloom
filters, image-based motion blur fall into this category. These effects are usually created by rendering the 3D geometry
to a texture, then rendering a 2D screen aligned quad to the screen. The geometry in the texture is no longer at the
correct depth in the world as the effect should be, thus working poorly in 3D Stereo. You should provide the option to
disable these effects for people playing in stereo and render the geometry to the back buffer.

Using 2D
Rendering in Your 3D Scene
Any object rendered as 2D doesn’t really have a real 3D depth, so it is placed at
the monitor depth. This will look very flat in 3D Stereo. If you are mixing 2D and 3D in your HUD you may have
inconsistent depths leading to eye strain. Again, render everything at the proper depth, in 3D, and test with stereo
on.

Sub-View Rendering
When rendering a sub view to the screen, such as a picture in picture display,
car mirror, or small map in the upper corner, you must set the viewport to cover the area before rendering. This trick
prevents strange stereo effects bleeding outside of the intended section of the screen.

Updating the Screen
with Dirty Rectangles
If you are determining only the parts of the screen that have changed and not updating the
rest of the screen this can cause odd looking rendering in 3D stereo. Just render all visible objects each frame.

Resolving Collisions with Too Much Separation
If you are resolving collisions by pushing objects away from
each other, make sure you don’t push them away too far. It looks bad in normal 3D when moving around but stands
out right away in stereo, making things appear to hover above the ground.

Changing Depth Range for Difference
Objects in the Scene
Splitting the scene into multiple depth ranges can cause distortions in the stereo effect
making some objects look shorter or elongated. All objects should be rendered in a consistent depth range for the best
stereo effect.

Not Providing Depth Data with Vertices
When sending vertices for rendering to D3D for
software transform and lighting, include the RHW depth information for stereo to function properly.

Rendering
in Windowed Mode
NVIDIA’s 3D Stereo only works when your application is in full-screen exclusive mode. If
you don’t support fullscreen mode, then game players can’t take advantage of 3D Stereo.

Shadows

Rendering stencil shadows using a fullscreen shadow color quad will not work properly in stereo. However,
re-rendering shadowed objects in the scene at their proper depth in shadow color will function correctly in stereo.
Shadow maps function fine, and projection shadows function as long as you are projecting to the proper depth for the
shadow.

Manually Writing to Render Targets 
Don’t lock render targets and do direct writes; doing
so bypasses the stereo driver.

Very Dark or High-Contrast Scenes 
Very dark scenes can become even
darker when using 3D Stereo shutter glasses. Providing a brightness or gamma adjustment will help this problem. Using
very bright objects on very bright and very dark objects causes ghosting, which hurts stereo. Testing your game in
stereo quickly shows whether or not this is a problem.

Objects with Small Gaps between Vertices 
Small
gaps in meshes can become much more obvious when rendered in stereo. Make sure your meshes are tight and test in stereo
to be sure this isn’t happening.

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