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Cosmic Storm
Cosmic Storm
Comments: 1

19.04.2019, 04:40

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Description: Pre-production Jasc Paint Shop Pro7.
No Post ptoduction.
As a general rule I do not assign ambient expressions for textures. Ambient is a great tool, but I find it ti be unrealistic because in real life most things don't glow in the dark. In fact I think overuse of ambient is what gives alot of images that CG look of being a little too perfect.
I wanted to immitate natural foliage as much as possible.
I was observing the plants in my apartment when I realized that the leaves were transparent and that they had a unique and before unnoticed by me refraction; as though they were filled with water. In fact, the leaves were actually brighter underneath, as the sun was above the leaf, and it's light was being refracted by the water within the leaf. The next time you are near a plant, check out the underside of the foliage to see the effect I'm talking about. Other software packages like Vue offer transparency maps, and it shows in the sense of "fleshy-ness" of the foliage.
The leaves in this scene are all high resolution photos with a transparency tweeked to make them look like they are indeed filled with water and fleshy. This particular type of transparency allows light to travel through the scene as it would in real life without any cheating from ambient materials. Do you guys find the foliage to be convincing?
Added by: rashadcarter1
Keywords: rashadcarter1, bryce5, psp7, noambient, refraction, foliage, transparency, fleshy
Date: 06.08.2006 12:09
Hits: 2645
Downloads: 90
Rating: 5.00 (1 Vote(s))
File size: 582.2 KB
Previous image: Misty Mountain Replica
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Author: Comment:

Join Date: 12.11.2003
Comments: 441

I definately think its convincing. Its a very peaceful scene. Reminds me of something in a movie, but I'm not sure which movie... Awesome.
06.08.2006 12:19 Offline Nightst4r nightst4r at

Join Date: 05.26.2004
Comments: 4478

I have observed that light difference between the upper and the under sides. I never thought about this refraction on the water inside. It sounds convincing, though. There are leafs that are hairy at the underside, though, mostly on trees in a rather dry environment to keep evaporation at bay. Nevertheless, this is a nice picture of yours. The leafs look quite natural, but might look even more natural if they had some specularity. Though nicely lit, they look dull.
06.09.2006 06:09 Offline Horo h.-r.h.wernli at

Join Date: 06.04.2006
Comments: 2622
hidden behind the haze

Horo points out the dullness of the scene, and it is because I made a rookie error. One of the biggest CG giveaways is overuse of the haze effect. I wanted to give the sense of a tropical environment with a thick atmosphere, but this is too much. The haze over that distant tree is so thick it looks more like it shoud be a distant mountain, not a tree just a few hundred yards away. Haze effects should be very subtle at these distances, even in the jungle. Haze effect lowers the overall contrast level of the scene, making all the colors appear increasingly grayish, and spoiling the specualrity of some of the more distant leaves, along with lowering the sense of immediacy and intimacy of the scenario. Haze obscures quality.
I just purchased the new Bryce5.5. It has many interesting new things, including new leaf textures. The artist who submitted these new leaf textures (who's name escapes me at the moment as I am not at my home computer), begins to address the transparency in foliage issue. The problem though is that her preset leaf textures look like glass. It is the same glass wall I hit until I got lucky and found a way around the "glassy leaf" problem.
The leaves in this scene do not turn into glass even though they have transparency. If anyone wants to know exactly how this effect was created just let me know. I have a new version rendering now that should be a marked improvement over this one as it is more elaborate and less hazy. Long winded again, sorry.
06.09.2006 19:34 Offline rashadcarter1 rashadcarter1 at

Join Date: 05.26.2004
Comments: 4478

I'm certainly interested to know more about it. The dullness I mentioned was not meant for the distant faolage but rather for the foreground ones. Has the haze already such a strong effect that near? I understand that it is also possible that the camera in fact was much further away and a low angle FOV was used. This is an easy way to make haze more visible than fiddling with the controls in the Sky Lab.
06.10.2006 12:05 Offline Horo h.-r.h.wernli at

Join Date: 06.04.2006
Comments: 2622
haze indeed causes many problems

The foreground plant on the left with the red flowers has leaves that have no specularity. This is purposeful as the forground plant on the right does have specularity. The top left and right corners of the image also have plants with leaves that are shiny. The haze gets in the way as the shinyness does not show through the way I intended. The new version is still rendering (more than a day now!!!!!!), and you will see the incredible difference a little haze makes on this image at these distances.
06.10.2006 18:27 Offline rashadcarter1 rashadcarter1 at

Join Date: 05.07.2004
Comments: 242

Very interesting experiment, and it turned out well. I've noticed that light appears different through leaves but it seems to be only a softening of the light- refraction wouldn't have any effect. The softening, I think, comes from the same principle as frosted glass- in this case, the cells full of water are mostly transparent, and the cell walls aren't. So, we have a very high frequency alternating mostly transparent/not transparent surface that scatters the light and results in a very soft glow on the underside. This is entirely hypothesis- It could be way off the mark. In Bryce, I'd do this by attatching a high frequency noise to the bump and setting the bump to 0.1.

If you really want a realistic forest or jungle, try using trees that aren't from Bryce. Bryce trees, through interesting, don't function very well as trees.

Also, I'd try a second sun in the image, as detailed by Horo in the tutorials section of {}.
06.11.2006 00:49 Offline LitoNico LitoNico at
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