Hi folks,

Thank you very much to 3DFineries for the help, I'll give it a go now.

Unfortunately, I'm not able to post the render at the moment, as it has been swamped out of the cache by countless area renders I've done since. I'll give 3DFineries' advice a shot and see where we get to. The lighting rig is a slightly adapted version of one I have used many times in the past with next to no issues. I created it from (IIRC) one of the default Poser presets in the making of Annie's 'Purity' set, which can be seen here: [http://glen85.deviantart.com/gallery/44536752/Annette-Purity]. The only change has been the addition of a specular-only light, as specularity was missing from the original. It does not include 'mesh lighting' in any way, and the background 'dome' I've used is set so that it does not cast shadows and is not a light emitter; its sole purpose is to create a seamless background and to give Annie's eyes something to reflect in raytracing. I've tried killing the newly added specular-only light but have still experienced the same problems.

If you'd like, I can share the light rig, if I can find out how to do it.

I'm using the 'Nights In White Satin' set from the late, great StudioArtVartanian, and haven't had these artefacts appear on other sets either. So, bearing in mind I've used the lights before and not had a problem, the character and her materials before and not had a problem, the scene items before and not had a problem, and the render settings before and not had a problem, I can only guess that it's something caused by a conflict. I have had these artefacts appear in much less noticeable amounts in other scenes, with different characters, lights and render settings, but they were easily fixed in post, but I'd like to find out exactly what is causing this so I don't face the problem again.

I'll get a render put up no matter what the outcome is, but it tends to take absolutely ages, unfortunately.

Cheers,

Glen.

I'm running Win 10 Pro 32GB RAM Intel Core i7-4790K CPU @ 4.00GHz Nvidia GeForce GTX 1660 Ti

My DA Gallery: glen85.deviantart.com/gallery

Peace, love and polygons!