[Radiance-general] Rendering for off-centre presentation in a VR lab

[Thomas Bleicher]

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 <
p.g.lovell at st-andrews.ac.uk> 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>
> >
>
>
>
> --
> 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
>
>
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