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

[P George Lovell]

Thanks Thomas,

Don't worry, I'm planning to pre-render everything, partly because I 
need high quality renders and don't have access to super-fast machinery. 
Also because in one manipulation I need to present items with shadows 
from different items, which requires some post-processing.

Best wishes,

George


On 29/01/2013 16:33, Thomas Bleicher wrote:
> 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 <mailto: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>
>
>
>
>     -- 
>     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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>
>
>
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-- 
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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