Specular with plane light

[muoto]

Hello,

i got a simple plane light, and a black material on a flat object with Hglossiness = 0.8, and Rglossiness = 1.0.

i should get some "fake" specular on that material.

on rendering, the specular is very grainy and not smooth at all...

any ideas ?

thanks !

[jackieteh]

try increase plane light subdivion, see whether it help or not

[Art48]

It's really difficult to provide an answer to a question which basically misses all substantial information.

VRay Version?
Render Settings?
Light Settings?
Screenshot?
...

[muoto]

yeah indeed, was a bit speedy on this one..

here is a sample jpg/max

working on max2016/3.30.04

I'm on adaptive 1/4 settings. Of course, if i go to 1/24 its get better. But the whole idea of the Hgloss was to "fake" specular, so it's seems a bit strange to push all the settings.



https://dl.dropboxusercontent.com/u/...1/specular.zip

[Raven]

Increase your MSR so that it will use more subdivs for your light and material samples

[muoto]

tried it, it doesn't really affect the Hgloss noise.
only setting the adaptive image samples max to 16 or 24 helped

[Raven]

Hgloss is not to fake spec, it is the specular component. It still needs light subdivs as far as I know.
If you want your images samples as low as 1/4 make your MSR 256. On your example this will render it very quick, about a second for me.
Just remember that MSR and image samples will need to vary depending on what your scene is like.

[muoto]

ok thanks
will try this out !

[muoto]

only disadvantage of putting a high MSR value, is that on complex scenes with lot's of materials and reflections, it will boost all the samples on the image, and therefore rendering time will be much higher.
usually on my scenes a MSR value of 16 is quite enough

[svetlozar.draganov]

You may also resolve the noise via Image Sampler settings or via Light Subdivions(Use Local Subdivs must be turned on) or by combining all three of them: