Precomputed Radiance Transfer in Unigine

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Anonymous Oct 11, 2005 at 14:00

05-10-09.jpg

Description
It’s a screenshot from Unigine v0.33 demo.
Unigine is a high-tech cross-platform (Win32/Linux) engine of virtual worlds. Main fields of application are games and virtual reality systems.

The screenshot demonstrates PRT (Precomputed Radiance Transfer) lighting, soft shadows, sky with sun energy scattering, reflection (see splinters of glass in the right-bottom corner).

Demo features:

# PRT (Precomputed radiance transfer) lighting
# HDR (High Dynamic Range) rendering
# Procedural sky with light scattering
# Postprocessing: motion blur
# Reflection
# Interactive lighting configuration tool
# Up to 350k polygones per frame
# Benchmark mode is available

You can download this demo (and 2 others) from our website: http://unigine.com/download/
We highly recommend you to use latest stable versions of drivers for your video card to run the demo.

More screenshots: http://unigine.com/screenshots/

Full Unigine features list: http://unigine.com/features/

9 Replies

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Ed_Mack 101 Oct 11, 2005 at 14:02

I’ve been a frustum.org fan for a long time, and these demos are really a joy indeed - and crossplatform :D

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corey 101 Oct 11, 2005 at 14:37

How do you like HDR rendering so far?

corey

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Ed_Mack 101 Oct 11, 2005 at 15:56

When I enabled HDR, I just got a black screen :( I have a GeForce 6800, and hoped for pretty images.

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DenDiesel 101 Oct 12, 2005 at 10:48

Don’t use HDR with AA because it’s impossible due to hardware limitations.

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SnprBoB86 101 Oct 12, 2005 at 15:15

ATI 9700 mobility (128 meg vmem), AMD 64, and 1 gig ram: runs the 128mb version nicely (did not try HDR)

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Pantheon 101 Oct 12, 2005 at 21:33

Would you be able to disclose any technical details about the PRT implementation. Is it per-vertex or perhaps -texel? Some lighting artifacts are vissible upon close inspection, most likely due to dynamic subdivision. This points to texture involvment.

A realy nice demo with a simmilar wow factor to the digoth moor wxp demo from the geforce 256 days. Lovely stuff :happy:

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Pantheon 101 Oct 24, 2005 at 09:22

Ok, on closer inspection the wireframe view shows a high tesselation pointing to vertex lighting but that still does not explain the odd shading artefacts. Perhaps this is due to some implementation of coeficient gradients. This is the best demo i have seen for the pc yet.

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NeARAZ 101 Oct 24, 2005 at 09:59

Is the 350k polys/frame a hardcoded upper limit? If so - why? :)

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DenDiesel 101 Oct 24, 2005 at 19:54

No, there is no hardcoded poly count limits. There are up 350k polygones per frame in this particular demo.