Show different geometry for each eye on an Oculus Rift

anonymous_user_840e95761 · August 24, 2015, 8:55am

For an experiment on binocular disparities we want to show different geometries for each eye using UE4 and an Oculus Rift.

We already implemented some Materials that make use of the ScreenPosition of each pixel to determine if it is rendered for the left or the right eye and show different textures. But there seems to be no “trick” to do the same for geometry.

Is there a way to render different geometry for each eye on an oculus rift? Alternatively: Where would such a feature be implemented in code?

Thanks for your answers!

anonymous_user_840e95761 · August 24, 2015, 5:12pm

I got an answer from user JohnMcPineapple https://www.reddit.com/user/JohnMcPineapple

How about just making the material of
the geometries invisible for one eye?

Since we can manipulate materials per eye, this question is answered for me.

anonymous_user_729f2b44 · November 18, 2015, 1:47pm

Can you send link to his answer? It will be very helpful.

anonymous_user_840e95761 · November 18, 2015, 3:16pm

Here is the link to the post:

TTV_Zikick · February 18, 2016, 4:02pm

Could you share the details of how you implemented your Materials to show different textures for each eye - this is something I need to do as well!

anonymous_user_840e95761 · February 18, 2016, 8:24pm

This is quite simple and works for the Oculus Rift (I don’t know if it works for other HMDs too):

Read the “ScreenPosition” value in the material
If the value is below 0.5 the material is rendered for the left eye (above 0.5 it is rendered for the right eye)
switch the texture based on this

anonymous_user_47a93b26 · November 16, 2020, 2:58pm

322199-

Thank you! This idea is very useful.