Large Speckles on an evening scene

[MarcellusW]

I've rendered two images; one 800px wide and the other 3000px wide. You will notice in the 800px there is what looks like a reflection of light on the floor below the wall lights. When I render this same image at a higher resolution, this reflection turns into multiple speckles. An effect I am not going for

 

Anyone know an easy answer to solve this?

 

Thanks!

[Francisco Penaloza]

those are your glossy samples, with interpolation in your material, un-check interpolation and increase your samples.

Don be shy 250 is ok. if you are using the unified system you have a few options.

Fist increase the contrast noise threshold. Default is 0.01, try 0.002 in all of them.

also you can increase in global tuning, the glossy precision multiplier.

and finally you could increase the max samples per pixel. default 128. You can try 260 or so.

[MarcellusW]

Thank you for the info. This for arch & design mats right( which is what I'm using).?

[Francisco Penaloza]

correct, it is a little check box that is located on the glossy parameters. it could be that one or highlight+FG only.

both of them create a "Fake" glossiness that render faster but if the samples are too low they look very bad.

[MarcellusW]

Thank you Francisco. That works!

 

Now if only I could get the displacement mapping to not have strange artifacts on the flooring tile pattern. Its just a black grid on white tile.

[Francisco Penaloza]

That tile seems pretty simple I will recommend to model it instead of displacement.

To get a nice displacement you need a very clean image, with small soft gradient for the edges and unless you paint it manually, a simple B?W image won't do.

Try to use floor generator script. That will do the trick very quick and will give you the options to put more details in your tiles.

or just model it, it should not take that long at all and the result will be way better than displacement.

[MarcellusW]

Thanks again for the input. Looks like I will model and check out the floor generator script. Curious would the displacement map issue be similar in vray?