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Macro Leaf Scattering

dburdick
Member Since Feb 25, 2004
399 Images, Last upload Dec 5, 2009

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Vue7.5I: I have been searching for a forumla to render more realisitic looking tree foliage populations - particularly for midrange and distant ecosystems. The fundamental problem is that the leaf alpha maps used in Vue are very harsh in the sense that they create very hard, saturated looking foliage which is fine for closeups, but not very good for midrange/distant renders. So here is a render progression using various leaf material formulas. The bottom two images use a procedural leaf alpha noise I came up with (no image maps - all procedural) which helps to allow the light, atmosphere and surrounding colors to bleed though and create more of a natural scattering effect, particularly in the lower right soft alpha image. Using a soft procedural alpha creates much nicer looking, more natural looking foliage. The downside is that using a soft alpha for the leaf material increases render times by 4x to 5x.
Details
Uploaded
May 17, 2009
Gallery
Vue
Genre
Landscape
Size
317.9 kB
Dimensions
1152x640

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150
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Image Comments


May 17, 2009 5:48:31 am
Superb artwork!

by lior Homepage »

May 17, 2009 6:09:02 am
Very interesting as I am trying to learn Vue

by pops Homepage »

May 17, 2009 6:48:07 am
very cool... love my vue!

by meselfr Homepage »

May 17, 2009 7:50:34 am
It does look better. I have created my own alpha maps for things. I am not sure what you mean by a soft procedural alpha map. Does that mean the area between the black and white portions of the map got blurred with noise being added?

by mojoDallas Homepage »

May 17, 2009 1:07:27 pm
Interesting. I wasn't aware of this phenomena.

by chippwalters Homepage »

May 17, 2009 2:03:02 pm
You learn something new every day :)
(not so keen on the x4 or x5 render times though! :) )

by FrankT Homepage »

May 17, 2009 7:20:59 pm
That is alot of added render time. It does look good though.

by Lunastar Homepage »

May 18, 2009 1:57:03 am
Very interesting test Dave. As Chipp I wasn't aware of that. Will keep it in my thoughts (I hope there are some).

by wabe Homepage »

May 18, 2009 2:29:51 pm
Very useful to know, thanks!

by Rutra Homepage »

May 19, 2009 7:41:29 am
Interesting experiment. Your trees look great! It's a shame that the render time is so long, though.

by FrenchKiss Homepage »

May 24, 2009 5:24:29 am
Great work....

by missgrin Homepage »

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