Author Topic: Grass, couple questions  (Read 1752 times)

2018-10-09, 13:02:42

alekba

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 I'm very happy with hair implementation in new release of Corona for C4D. For some time look on Max version, couple guys made very nice stuff.
I make couple tests, and it's good when you render hair - fur. But when I try grass, find some problems. Must use Corona hair material instead of standard Corona material. Also there is no option to Corona use color from Cinema hair material ( try texture and color for roots and tips ). I try to modify Corona hair material, get some result, this probably can be better with more tweaking.
 Render time is long, I guess that hair material is to demanding. I notice that grass have some translucency or so. This is nice, but overkill for ordinary grass.
So one solution is to make different material for grass ( plants, leaves etc. ). In general, C4D users mostly do not do character work ( its shame, C4D hair system is very versatile ), instead there is many arhviz works. So, dedicated material for grass or possibility to use standard Corona material.

 Anyway this is great step forward. Now Corona team have ground for further improvements.
One test, notice noise ( over 250 passes ), strange thing after some time noise level start to rise. Also use denoiser 0.6. Most weird are strips in grass blades? In some cases this can be nice, but look strange on common grass.
 I would be very grateful for any advice - tips.

2018-10-09, 14:20:29
Reply #1

romullus

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Most weird are strips in grass blades? In some cases this can be nice, but look strange on common grass.

Try to reduce glint strength to the minimum - the stripes should disappear.
I'm not Corona Team member. Everything i say, is my personal opinion only.
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2018-10-10, 15:10:04
Reply #2

alekba

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 Thanks, this help. And render is much, much faster, . Plane is 400X400 cm, grass is more or less real dimensions. Make couple variations.

2018-10-10, 15:38:34
Reply #3

ficdogg

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the way I get variation in color is to project an image of grass for the color of the leaves(in the corona material) I basically add it to the diffuse, as well as the tint and transmission color, and play around a bit.