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Volumetric Slab Clouds
Volumetric Slab Clouds
Comments: 6
icecreamman

29.03.2024, 14:20








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Landscape with fake spruces
Landscape with fake spruces

            

Landscape with fake spruces
Description: You are looking from a peak down to a hill with lots of spruces.

I wanted to use the "old" Bryce trick to generate a lot of trees. I my case "fake spruces". (roughly said copy a terrain and use the spikes function in the terrain editor to generate the "trees".)
For the trees I used first a leave material from the Bryce library, but I was not quiet satisfied with the result. The trees looked rather a bit like toy trees. The I thought it might be a good idea to create a special material for the trees. A material with a kind of holes in it to simulate the empty space between the branches. I think, it looks not too bad (except on the slopes)
But the render time was nearly inacceptable. More than 10 houres. Just antialiasing needed more than 7 houres.
Added by: electro-elvis
Keywords: landscape, trees, Bryce 7.1.109
Date: 10.20.2011 15:20
Hits: 3345
Downloads: 58
Rating: 5.00 (1 Vote(s))
File size: 357.7 KB
Previous image: Above the gorge
Next image: SH_ROOMS



Author: Comment:
davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224
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Good going, getting this effect working so well! The tree material looks convincing across the ridge line, a little less so in the valley. Were the ground is pale absence of the trunk is a little more obvious.

This method, as you have discovered, is very processor intensive. The advantage, of course, is the reduced ploy count and reduced number of objects in the scene, but the overhead of using transparency material might be comparable (or more than - depending on lighting) to using "real" geometries.

If the tree material were not casting shadows that might help? I don't know if you tried that. And it might be possible, providing the tree terrain used is not already at a high resolution, to duplicate the tree height map, set the resolution to maximum and filter it to make the trunks... But I don't know, that would need very thin "spikes" and they would need to remain aligned with the "leafs". And at that point, the filtering might cause too much "drift" in the heights. From my own experiments with this method, I know it can be difficult to get the trees the right height for the terrain variations. You've done a very good job here of getting that balance.
10.21.2011 08:10 Offline davidbrinnen mail at davidbrinnen.co.uk http://www.davidbrinnen.com
rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610
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Looks wonderful. What no one has ever told you is that Blend Transparency is probably the slowest function in Bryce in terms of rendering. This is why I do not suggest the use of billboards and the like 3d geometry is better, 3d geometry takes more ram, but renders soooo much faster.

Your results are fantastic, however. I am one who feels that render time should rarely prevent us from going for what we believe in. Great work.
10.21.2011 08:11 Offline rashadcarter1 rashadcarter1 at aol.com
slepalex
Member

Join Date: 10.15.2010
Comments: 881
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A good method! I sometimes use it.
10.21.2011 15:18 Offline slepalex slepalex at yandex.ru
electro-elvis
Member

Join Date: 12.11.2010
Comments: 247
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Thank you gentelmen for your kind comments.

I even tried to make a material that might look like a broad-leafed tree at least from great distances. I thought I could spread little spehres over the area, where the trees should be found and I would give this spheres a a volumetric materia. the lower part of the material were a kind of trunk and the upper part the foliagel, but I learned my skills in material making are still limited for this challenge.
10.22.2011 12:11 Offline electro-elvis
Horo
Admin

Join Date: 05.26.2004
Comments: 4721
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I'm a bit late in the discusion and all has already been said. Depending on the distance from which you look at the trees, a green/yellowish texture could be used mapped in World Space on the spiky terrain may suffice. Your method is definitely more elaborate and the camera can be nearer. Great sky!
10.26.2011 17:13 Offline Horo h.-r.h.wernli at bluewin.ch https://www.horo.ch/


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