Re: [Plib-devel] off-axis stereo projection with plib

[Bram S. <br...@sa...>]

steve wrote:
> Bram Stolk wrote:
> 
>>ssgHello(ALL)
>>
>>
>>I'm trying to add a stereo option to a PLIB application.
>>Now, I want to do the stereo properly.
>>This means not using the 'toe-in' method.
> 
> 
> No!  Just render the left eye, move the camera about 6cm to the right
> and render the right eye.  Don't change anything else!

I'm pretty sure this is not enough.
Your method may create some illusion of some depth, but it is
not proper stereo.

Especially with large screens, you want objects to appear
on the screen, in front of the screen, and behind the screen.

This means that for an object that travels from eye point to
infinity, this will happen:

- first, the projection for R is of the left of projection L
- at screen distance, the objects for L and R coincide in 
  their projection
- after that, the projection for R is on the right of the 
  projection for L.

Your method will not create negative,positive,zero parallax.
Only negative parallax.

Read Paul Bourke's info on off-axis projection again, it
has some informational figures.

   bram

-- 
Bram Stolk, VR Engineer SARA, Amsterdam.   tel +31 20 592 3000

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