Using Slit Scan with RayRender

VR headsets have trouble with stereo images at the poles of the 360 sphere, when you look up or down. This effect can be minimized by pole merging, which gradually makes the left and right eye the same towards the poles. RayRender's Camera tab renders this merging effect for stereo output.

1.

You can examine the falloff in a scene by setting up a simple script in the Node Graph using a Sphere, and a Camera connected into a RayRender.

2.

Set the RayRender projection mode to spherical and in the Camera tab, check Stereo Scan Enable to activate the stereo controls.

3.

Add a C_SphericalTransform node and set the Rotation mode to Rotation Angles.

4.

Adjust the rotation so that the view displays one of the poles, in this example, the 'top' of the scene is z -90.

5.

RayRender's Falloff Type defaults to Cosine, but you can see the effect of other types by selecting them:

• None - no IPD adjustment occurs towards the poles.

• Linear - the views are merged gradually from the Start Angle specified toward the pole. Increasing the angle moves the start point toward the poles.

Note:  Setting the Start Angle to 90 disables pole merging.

• Cosine - the views are merged smoothly toward the poles. Reducing the falloff shifts the transition in depth towards the poles.

Note:  Setting the Separation Falloff to 0 disables pole merging.

Falloff Type set to None.	Falloff Type set to Linear.
Falloff Type set to Cosine.