Ugly black junctions

[john2]

im rendering a building, vray shows black patches at junctions. what should i do? I checked the model but it's fine.

[eidam655]

that's IMO either Ambient Occlusion in render settings or a dirt pass in the material.

[john2]

here's my ambient occlusion setting. what is the optimum setting that one should use??

rest all are default

[chon]

As eidam655, did you put a dirt diffuse on your material ?

[thomthom]

Reduce your amount. Defaults are 0,8

[john2]

@thomthom said:

Reduce your amount. Defaults are 0,8

well that works. the defaults are OK. do you people use defaults for ambient occlusion.?? i actually needed very sharp lines of edges

[thomthom]

Some times I reduce the amount to 0.4 or 0.6 - depending on model. Rarely need to increase it.

Might adjust the radius as well on occasion.