Rendering for off-centre presentation in a VR lab

radiance-general
3

George

Sounds like a nice project! Please note that depending on the number and
complexity of objects in your scene the rendering times for Radiance may
not be suitable for real time viewing. If you hit this problem you can
pre-render textures for your objects in Radiance that capture the lighting
situation. You then just have to map the rendered textures on your object
and are free to use your game engine to provide the perspective image
necessary for your projection.

I don't have URLs at hand but there were some presentations on this in past
Radiance workshops.

Regards,
Thomas

···

On Tue, Jan 29, 2013 at 4:36 AM, P George Lovell < [email protected]> wrote:

Hi Everyone,

I'm attempting to use Radiance to generate images for presentation in a
large VR space - the system currently uses a game-engine but I'm not happy
with the quality of the rendering as I'm interested in the visual
perception of shadows and shading.

The space* is approximately a 6x6x2metre volume with a stereo (polarized)
screen at one end, the screen is roughly 6x2 metres.

I want to present a rendered scene as if it lies behind the screen, i.e.
the screen is a window through which we view a rendered object. The viewer
can then walk through the space and I can present updated views relative to
the current viewing location (I have 6 DOF head tracking). Obviously this
requires a lot of offline rendering and a relatively narrow movement range
- just to cut the rendering overhead.

It's easy enough to see how I might render images for presentation when
viewer and the viewing target are positioned centrally within the world,
i.e. looking straight forward towards the middle of the screen. What I
don't understand is how I render scenes for when the viewer has move
off-centre to left or right. Firstly, perspective is going to make one side
of the screen smaller than the other, I'd need to correct this so that the
screen image fits on the actual screen.

I think I could build-in some markers that denote the corners of the large
VR screen, then stretch the image so that these markers lie on the corners
of the screen - this seems a little clumsy.

Is there a better way?

George

*<http://www.abertay.ac.uk/**about/news/pickoftheweek/2010/**
name,5454,en.html<http://www.abertay.ac.uk/about/news/pickoftheweek/2010/name,5454,en.html&gt;
>

--
Dr P. George Lovell,

Lecturer in Psychology
University of Abertay Dundee
Dundee
DD1 1HG

Tel 01382-308581
Fax 01382-308749

Researcher/Co-investigator,
School of Psychology, University of St Andrews

RM 2.01 (The Tower Room).
Phone (01334) 462085

______________________________**_________________
Radiance-general mailing list
Radiance-general@radiance-**online.org<[email protected]>
http://www.radiance-online.**org/mailman/listinfo/radiance-**general<http://www.radiance-online.org/mailman/listinfo/radiance-general&gt;