Help V ray lighting question

[craigball]

Hi

I need help with getting rid of the bobbly effect I am finding in my render. This is my first attempt at lighting and materials using V ray so I apologise if it is something really easy.

[own1221]

hey i think the "bobbly effect" your referring to is called noise and can probably be fixed by changing the "noise threshold" default is 0.01 which is probably what you got now change it to something smaller maybe 0.005 or 0.001 smaller it is the less noise there is.

[craigball]

thank you for your reply

were would i find the "noise threshold" option?

regards

[FlytE]

also, set your irradiance map to high and bump your hemisperic subdivisions up to 50/30 (also in irradiance map)

[own1221]

under rQMC sampler -> noise threshold

[birdman67]

...but don't freak out when you start bumping up these settings. You're going to find that render times will increase (sometimes ALOT!) Rendering with Vray isn't too difficult, but getting the results you want in the least amount of time takes alot of experience, and takes alot of patience, knowledge, and trial and error. Good luck!

 

Also, there are alot of tuts out there on this very subject...I would highly recommend getting your hands on whatever you can find (free or yes, BUY some!) They will be lifesavers. Here's a link to get you started: http://www.spot3d.com/vray/help/150SP1/tutorials_interior.htm

[Brian Smith]

hey i think the "bobbly effect" your referring to is called noise and can probably be fixed by changing the "noise threshold" default is 0.01 which is probably what you got now change it to something smaller maybe 0.005 or 0.001 smaller it is the less noise there is.

 

this is true, but remember that the noise threshold is only going to dictate the amount of noise for any given setting if there are enough samples (ie subdivs) being taken for that setting. you could set the noise thresh value to 0.0, ie a perfectly noiseless scene, but if you dont have enough samples for reflections, motion blur, depth of field, shadows, GI, or any other blurry effect that setting governs, it's not going to make a lick of difference. also remember that for all of the adaptive features, the noise threshold value dictates how adaptive a feature will be.

[Brian Smith]

also, set your irradiance map to high and bump your hemisperic subdivisions up to 50/30 (also in irradiance map)

 

i dont think this will help because i dont think that the irradiance map is causing the noise. irradiance maps produce a larger, more splotchy noise. this noise looks like qmc, because it's fine and grainy looking. if it is, then increasing the subdivs and reducing the noise thresh value is the only thing that will help unless you use a different GI solution. also, even if it is the irradiance map causing the problem, increasing the resolution (ie using a higher Max rate) will only make the noise smaller and more defined. using a lower Max rate will blur the noise and make it harder to see.

[craigball]

Thanks for all you comments proper help full I toned doewn the nose by adding more samples to the lights I have a new thread http://www.cgarchitect.com/vb/31154-first-vray-room.html showing my final render so far thanks every one.