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Author Topic: 2d trees darker on one side of render. Shadow issues possibly?  (Read 1165 times)

RobH2

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I have 2d trees in the distance of a view. Imagine the camera pointing from 6 o'clock towards 12 o'clock. The sun in at abut 4 o'clock.

It seems as if the trees in the distant right are getting backlit as they rotate to face the camera. How can I correct this and have all the distant trees render the same density?

ForestPack Pro 6.3.1, RailClone 4.2.13, 3ds Max (Max 2021), GIGABYTE X570 AORUS x570 Master Motherboard,
Ryzen 9 3950x CPU, Noctua NH-D15S CPU Cooler, 128 GB G.SKILL Trident Z Neo DDR4 Ram, Sabrent Rocket NVMe 4.0 M.2 drives

RobH2

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Re: 2d trees darker on one side of render. Shadow issues possibly?
« Reply #1 on: March 26, 2015, 07:30:57 AM »
I'm going to partially answer my own question. I came up with a workaround but if there is a better method that uses the features of FP let me know.

For the short term I excluded the distant trees from my light. I then duplicated that light and moved it so it's directly behind the camera. I 'include' just the trees in that light and adjust its brightness. It looks pretty good and is sufficient for my client.

However, if there is another way that uses techniques within FP I'd like to learn it.
ForestPack Pro 6.3.1, RailClone 4.2.13, 3ds Max (Max 2021), GIGABYTE X570 AORUS x570 Master Motherboard,
Ryzen 9 3950x CPU, Noctua NH-D15S CPU Cooler, 128 GB G.SKILL Trident Z Neo DDR4 Ram, Sabrent Rocket NVMe 4.0 M.2 drives

Michal Karmazín

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Re: 2d trees darker on one side of render. Shadow issues possibly?
« Reply #2 on: March 26, 2015, 10:37:24 AM »
Hi,

The solution will depend on the render engine used. In case of mental ray, Forest Pack includes a custom shader that enhances the rendering of billboards - Forest Shader, which requires the use of Forest Material.

If that's your case, I would suggest you to lower the Self-ilum factor value (by default set to 50%) under Material - Forest Shader. That should eliminate that undesired effect.

Anyway, as you've already tested, exclusion affected items from light source would be an another suitable option.

Best regards,

RobH2

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Re: 2d trees darker on one side of render. Shadow issues possibly?
« Reply #3 on: March 26, 2015, 03:47:26 PM »
Thanks Michal. I'm using VRay but maybe the workflow would be the same. I'll have a look and see if it helps. There is usually more than one way to achieve desirable results. It's fun to try them all.
ForestPack Pro 6.3.1, RailClone 4.2.13, 3ds Max (Max 2021), GIGABYTE X570 AORUS x570 Master Motherboard,
Ryzen 9 3950x CPU, Noctua NH-D15S CPU Cooler, 128 GB G.SKILL Trident Z Neo DDR4 Ram, Sabrent Rocket NVMe 4.0 M.2 drives