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the child's mind
Comments: 7
doibugu10

18.04.2024, 22:49

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Ice Calf

Ice Calf
Description:	Using Horo's greyblue moon hdr for light and an empty bryce sky for background. Careful selection of transparency on the water provides uplight from the "underwater" half of the hdr. The ice was formed from two lattices and a 21 stones. The land from a terrain. The water an infinite plane. Most of my time was spent tweaking the light levels from the hdr and correspondingly the response of the materials involved.
Added by:	davidbrinnen
Keywords:	davidbrinnen, bryce6.1, hdr, IBL, horo, ice, sea, blue
Date:	05.11.2007 20:12
Hits:	3950
Downloads:	109
Rating:	5.00 (2 Vote(s))
File size:	123.0 KB

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gat
Member

Join Date: 12.21.2006
Comments: 667

5/5 as always, the materials look absolutely great, so do the rocks. And, are those shadows on the rocks from the hdri through the water?

05.11.2007 20:17

rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610

5/5 Agreed! Very nice. I too have noticed the awesome potential of hdr shining up through a transparency water surface. It has really powerful implications as demonstrated here. Very nice David.

05.12.2007 14:50

gat
Member

Join Date: 12.21.2006
Comments: 667

I didn't know ibl could do that, I tried it before with a sphere light, but it didn't work with an infinite plane. The ibl must be treating an infinite plane as a regular 2D face.

05.12.2007 15:43

Horo
Admin

Join Date: 05.26.2004
Comments: 4721

The most striking thing here is how the ice calf is lit from below. The water itself is a 5/5. It's so calm and the light is just beatiful. I've also experimented with light from the lower part of the hdri but never came up with such a beatuiful effect.

05.13.2007 14:25

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

Thanks - but I must say, I'm not etirely convinced by my own iceburg thingy. Gat, the thing is that the hdr provided by horo issues light from all directions, whereas many of the hdr's found on the web do not produce any significant light from below.

05.13.2007 17:48

gat
Member

Join Date: 12.21.2006
Comments: 667

Yes, I know that, but still even with a sphere light under an infinite plane I couldn't get that same affect for some reason, maybe I should try again.

05.13.2007 20:52

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

What do you mean by a sphere light? Do you mean a standard bryce point light source? Or do you mean a spherical light source which is comprised of many individual point light sources - such as was used to achieve global lighting before the wonders of IBL were available in bryce?

05.13.2007 20:59

gat
Member

Join Date: 12.21.2006
Comments: 667

I was going to say point light at first, but its a sphere object in bryce..................

05.14.2007 03:48

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

Ah... it appears as a sphere object, but the light is emmited from the centre - I think it is just represented as a sphere so it is possible to select it and move it around. There is a simiar issue with the parralell lights, if you experiment with them you will find that they are just point lights with a paralell cut off. What you need to get this effect without IBL is more lights - as I am sure you are aware - a point light source is just not going to cut the mustard in this case.

05.14.2007 08:30

Horo
Admin

Join Date: 05.26.2004
Comments: 4721

gat

I've tried that with a spotlight below a water surface once (search for 'iceberg' here). As David says, it didn't cut the mustard - but it does create an effect.

05.14.2007 15:53

gat
Member

Join Date: 12.21.2006
Comments: 667

hmmmmm, then I must have had the refraction level up too high and the rays just scattered, thanks

05.14.2007 17:58

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

You raise a good point there, you may or may not have noticed that rays can be reflected and transmitted at the same time - just as you can have 100 diffuse and 100 ambient... so ending up with impossible conbinations. A mirror even at 100, if transparent will still let 100% light through, even though theoretiaclly 100% has been reflected. Just inpossible physics.

05.14.2007 18:50

rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610

physics

The simple truth is that believeability comes down to one word... interaction. The more the different elements within a scene interact with one another convincingly through reflections, transparencies, transmissions, shadows, bump, specularity, and other effects the more realisitic the scene becomes. Light is the key to the story a scene will tell. The more accurately we present the light the more tangible the models looks within it. The impossible physics of the materials lab are one of my favorite areas of Bryce.

When I examine the cause and effect of the light underneath the iceberg I feel that it might be plausible after all. The water may have a snowy and highly white reflective bottom. sending up the extra light after-all.

The only change I might consider is to see what happens to the water if you lower the diffussion to some level between 0-4. I am in love with the wave pattern you've assigned but I wonder where the water gets that color this far up north. This is supposed to be the most pure water on the planet as glacial meltoff. Less diffussion might make the water look cleaner. Perhaps great transparency would allow the eye to penetrate the water surface a bit more. Generally, I think the scene looks extremely good. As long as the elements are interacting with one another as in this case where the stones cast upsode down shadows on each other because of all the light coming from below, the scene makes a sort of "sense." Somehow I could image a place like this.

05.15.2007 04:55

gat
Member

Join Date: 12.21.2006
Comments: 667

I think that water got its color from the sky, exactly because it is so pure.

05.18.2007 02:53

rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610

Perhaps you are right gat, though the sky is blue and the water is green, almost like there is algae. I'm not certain but I'm almost certain the diffussion level is green colored and above 10%. Only David can tell us for sure.

05.18.2007 04:50

davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224

5.0 with green diffusion. Without it, the water looks better. No doubt. Tranparency is also dark green. Making that white lightens the water to the colour of the sky - essentally it becomes a crinkly mirror. However, this lets too much light through to the underside of the model. So some kind of shielding would have to be employed or a different hdr used to go down that route.

05.19.2007 18:03

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