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Snowglobe
Comments: 4
adrian

16.04.2024, 14:51

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YABGIFT

YABGIFT
Description:	Yet Another Bryce Global Illumination Fake Test - using David's method 5.31 in an indoor scene with sunlight shining through windows. The original scene as constructed (above left) as seen by the camera through a filter (or gel) with the ambient map (top centre) in channel-B and reflection map (top right) in channel-A mixed about 40/60. Total render time 2 hours. I think this is very natural looking. In fact, I constructed part of the environment where I've noticed the red from the near door on the carpet and it looks very similar. The procedure used is repeatable, nothing hit-and-miss or accidental. Sunlight (here supported by a radial) shining in the room does not pose any problem.
Added by:	Horo
Keywords:	GI, illumination, fake
Date:	06.15.2008 14:04
Hits:	3191
Downloads:	74
Rating:	0.00 (0 Vote(s))
File size:	112.9 KB

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rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610

I really like the 3d impression of the scene. I think that with soft shadows from the sun this would look even more amazing. The orange color transfer is very subtle here, I see almost no color transfer onto the white walls. I could almost feel myself walking down this hallway. Excellent!

06.15.2008 14:20

Render Man
Member

Join Date: 11.10.2007
Comments: 358

This looks very natural the way I would think this would look in real life. The render time is good so it is doable for those that want to create fake GI.

The sphere looks like it may be floating but not sure.

I was wondering if that was one of your works of art at the end of the hall?

Are the ceiling lights on in the bottom test? If so would they wash out the shadow light from the sun to some degree?

06.15.2008 15:22

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

The suble tranfer of colour between surfaces is quite convinceing. The shadow regions are realisticly soft, particularly around the light fittings, the upper half of the left hand wall looks a little too bright, I would have expected there to be a shadow upper in the corner on the orange wall. Otherwise, no complaints. Good work.

06.15.2008 17:38

Horo
Admin

Join Date: 05.26.2004
Comments: 4721

Thanks all. This is a work to test repeatability with this faking scheme that also works for Bryce 5, probably even for Bryce 4. There are still things to improve in this scene. Soft shadows from the light shining from the outside for example, as Rashad suggests.

There are also 32 randomly distributed radials with square falloff and an inverse gradient near the ceiling to brighten it. As you can see, it is black in the original scene and a black blotch in the reflection map from the picture on the wall and I had to compensate for that.

Yes, RenderMan, this is one of mine, one I've never published because I worked off a very dark experience with it. And yes, apart from the faint radials near the ceiling, the visible lights on the ceiling light the room. They do wash out the shadows cast by the sun (and the supporting radial) but this is also the case in reality. The sphere appears floating, it isn't but I don't care. I wanted to see how the colours get on the Bucky-ball and wanted to see the blue on the carpet and on the wall from the column.

All said, I think it is now time to compile what we've found out so far to a tutorial so others can also start experimenting and this may help us to fine tune things.

06.15.2008 18:11

richter
Member

Join Date: 04.15.2004
Comments: 1092

Nice outcome from this test, Horo. I'm finally able to try something like that out. I think it'll be ready by the end of the next week, maybe sooner. I have nothing to add for the lighting details right now, because my experience in faking GI in Bryce is... let's say "not enough". The only thing I noticed (and maybe because of the angle of view) is that the sunlit areas on the floor do not seem to be parallel as one would expect.

06.20.2008 19:47

rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610

Great point Richter about the sunlight through the windows and not being parallel as they should. This is an indication that Horo did not place the radial far enough away so that the shadows would all fall in the same direction. This is a clever issue with sunlight that Horo surely already understands but many Brycers fail to accept, you need a very distant radial as the sun, not just a bright one. I had asumed the fov was distorting the alignment but after reading Richter's comment it might well be the radial placement. Good eye mate!

06.20.2008 20:13

Horo
Admin

Join Date: 05.26.2004
Comments: 4721

It is the FOV (90 deg) that is responsible for the unparallelness of the sunlit strips on the carpet. I've aligned sun and radial precisely, using different colours until the nearest sunlit rectangular on the right wall exactly matched.

06.21.2008 09:02

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