Quad-buffered mode and Powerwall

You can use Pixyz Review on VR immersive devices such as Powerwall stereoscopic screens.

In quad-buffered mode, you can use a flystick or a joypad to control navigation.

NOTE Unity no longer provides support for the ART Flystick 2 and Version ART 2.14.

Requirements

This configuration is required for the quad-buffered mode:

One rendering node, that is, without cluster
The ART optical tracking system
An Nvidia Quadro GPU for stereoscopy

Setup

To set up the quad-buffered mode, you must provide information about the position of your Powerwall screens and your users according to only one position reference.

You can use two modes:

Trackerless

You can define a point in your room that is the reference for the full setup.
D-Track system

Use the reference from your ART optical tracking system, which is often placed with a set square in your room.

Procedure

On the AR/VR pane, select Quad Buffer from the list of hardware. If the AR/VR pane isn't displayed, use the Window menu to select which panes to display.

Step 1: identify the reference or use your own reference

If you use the ART Tracking system, use its reference.

If you use the Trackerless mode, you can take any point in your room, but we recommend that you use one of these points:

The middle bottom of your screen
The position of your user

These points help you save time when setting values afterward.

Take tape measures.

Step 2: size and place your screen according to your reference

This information is required:

The size of your screen, that is, the width and the height in meters
The resolution of your screen
The reference that you have chosen

Set this information:

Setting

Value

ScreenResolutionWidth

ScreenResolutionHeight

Set the resolution of the targeted Powerwall screen, in pixels.

ScreenLeftBottomCorner
ScreenRightBottomCorner
ScreenLeftTopCorner

Set these values for your screen. Position each element according to your reference. All measures must be in millimeters. Values can be negative.

Set the position of the corners of the Powerwall screen according to the reference point of the tracking system as 0.0.0 for the X, Y, and Z axes:

X is the screen width, with 0 as its center.
Y is the screen height.
You must also calibrate your ART system with the Y axis as the up axis.
Z is the distance from the screen to the ART calibration origin.

Example

I'm not using D-Track. My reference is the bottom middle of the screen. Its position is the following:

x = 0
y = 0
z = 0

My screen is 6 meters wide and 2.4 meters high:

Setting	X	Y	Z
ScreenLeftBottomCorner	-3000	0	0
ScreenRightBottomCorner	3000	0	0
ScreenLeftTopCorner	-3000	0	2400

Step 3: place your user according to your reference

You must indicate where your users are placed according to the reference. To do this, you provide the position of the head of the user who wears the 3D glasses.

If you have multiple watchers, place the head of the user in the middle of the group or seats. The further the user moves from this point, the more distortion might occur.

Set HeadPosition to the position of the head of the user, using the X, Y, and Z values.

In our example, the user is located at 2.5 meters and is standing up:

Setting	Value	Comment
X	0	The user is usually in the middle. The value is 0 from the reference.
Y	2500	This value represents how far the user is from the reference, that is, the screen.
Z	1700	This value represents the height at which the head of the user is placed, which 1.70 meter from the ground.

After setup, you can enter VR and wear the glasses to check rendering on your screen.

Settings for the ART D-Track system

This information is required:

Setting	Value
MotionSystem	D-track
GlassID	The ID or number of your ART glasses body (head)
HeadPosition	The position to use if the glass trace is lost.

This information is optional:

Setting	Value
Fast Launch	Whether to enter VR faster. If you select this option, you can't grab objects or use laser interactions. Known isssue: If you launch a scene that contains interactions in fast launch, Review closes.
SpawnPoint	Use this setting to start at a specific position. See Define SpawnPoint.
MotionSystem	If you're using an ART Tracking system, select D Track. Otherwise, select None. If you select None, you can navigate with the mouse in Orbit Camera mode.
NearClipPlane FarClipPlane	Adjust the culling of your camera.
VirtualScale	Use this setting if you need to scale your scene.
IPD	Specify the interocular distance. The average is 65. The value must be between 62 and 68.
Calibrate Screen	Ignore this option.
UseEnvironment	Use this setting if you want to use a background environment. You can use your own HDRI map for an environment. You might need to scale the map if your model is big. See how to choose your own VR environment.