STREAKS ON WALL

[MAHDESIGN1]

Would someone know what might be causing the streaks to appear down the wall ?

At first I thought they might be a reflection from the boards in the ceiling, but they also appear on the right side where the boards are perpendicular to the wall.

I’m using a Mac Studio M1 chip ( Sonoma 14.6.1 ) and Twinmotion 2024.1.1 - Lumen on

[lakdesign]

Try turning on depth of field and set to infinity…

[MAHDESIGN1]

Thank you - unfortunately, that did not seem to affect it.

[lakdesign]

Is it the same using PT ?

[MAHDESIGN1]

I am on a Mac, so do not have access to PT

[slaflash]

It’s possible you have too much light. Here’s a list of a few options:

1. Go to Environment, select the dropdown under natural lighting, turn down sun intensity to 0-50, and ambient to 1.00.
2. Go to Camera, Exposure and WB dropdown, change highlight reduction to 1.00, shadow boost to 0.00.
3. Under Render (if using lumen) turn scene detail to 4.0, Reflection setting quality to 10.0, bounce count 2.0. Shadows 10m, Shadow bias low (0.25).

Let me know if that doesn’t resolve anything.

[slaflash]

I thought of another issue, if you are using light sources that have shadows turned on, they are probably bouncing off the grooves of the wood paneling and creating the streaks. Try turning down the Attenuation and Intensity of your light sources or adjusting the cone angle. Have your light sources be roughly .5-2.0 lm, and Attenuation to less than 1.5m.

[MAHDESIGN1]

Thank you very much for your suggestions and I implemented them incrementally to see which one would make a difference.

Unfortunately none of them did.

Finally thinking more about the shape of the streaks on the wall, I decided to think “out of the box” and insert a plane from the primitive folder above the exterior of the house and that lessened the effects of the streaks. But, that did not adequately explain why the streaks appeared where the boards where perpendicular to the streaks on the right side of the image.

Making the plane even thicker reduced it further until they disappeared completely.

Oddly previous renditions of the model did not present that issue, because the T&G was one solid - in this new rendition I broke the boards into separate solids to enable to have the wood grain appear more random - thereby perhaps light to be able to pass through.

Thanks again for your suggestions

[slaflash]

Yes, sometimes adjusting the highlight reductions and shadow boost slider can fix that in the future, but ultimately, I have found some solid objects still allow light passthrough like you experienced. Thanks for sharing your workflow!