Bad quality render

[acraft]

On the picture I've rendered appears "Cube" effect, in the style of a jpeg compression. Which parameters schould I change ? Accuracy, under Final Gathering ?
How schould I put ?

Thanks

[atyss]

Generally, in min/max you will put something like 0.01/0.1. I suggest you start from 0.1/1, and decrease until you get rid of the artefacts.

Also, the Accuracy parameter should be at least at 300, and you can crank it up to 3000.

Of course, decreasing min/max radiuses and increasing Accuracy will result in longer render times.

Hope this helps
Salutations - Cheers
Bernard Lebel