white dots during rendering

Drogo Nazhur

i am rendering an image with a darker background and a lot of white dots are appearing in the final version. How do I get rid of them?  is there a way to increase the qualiy of the rendering? if so, how and what should it be set to? I am using the deafults.

mjc1016

Posting the render (or cropped portion) showing what's going on would be very helpful.

Drogo Nazhur

The white dots over on the left shouldn't be there. They are left over from the rendering process. It is as if the rendering didn't finish even though it said that it did.

mjc1016

It didn't.

Those doors are about as glossy as they can be, without being mirrors.  As such, they will take a very long time to render 'clean'...

Two quick possible solutions...make the doors less glossy.  I'm guessing that the gloss is coming from a top coat layer...if so, increase the roughness for it.  If it isn't top coat, then adjust the glossiness directly.

The other...add more time/iterations to the render.

A third option...increase the AMOUNT of light (from lights) in the scene and account for the resultant 'over exposure' in tone mapping. 

SpottedKitty

candybonanza_4e529f982f said:

It is as if the rendering didn't finish even though it said that it did.

Note that Iray renders never actually "finish" in the same way as 3Delight renders, they hit stop conditions instead. There are three; render time, number of render iterations, and convergence, which is a measure of "completeness" — but the default value is not 100%. (In fact, you shouldn't use a 100% value for convergence, but you can use values only a tiny fraction less than 100%.)

You might have to juggle a bit, but you should be able to adjust these values to get better results.

Drogo Nazhur

mjc1016 said:

 

The other...add more time/iterations to the render.

 

How do I do that? I've been going with the defaults?

harrykim

from beginner to beginner, ...

take a look into "render settings - progressive render - completion"

According to default setting your render has to be finished within 7200 sec ( see Max Time),  And

during this 2 hours the render engine updates itself 5000 times ( Max. Samples = iteration ( hope this is correct) )

If one of this limits are achieved the render stops automaticaly.

And just a note, ... in case your scene is to big for your GPU the render will switch to CPU. This can double the time to finish your render.

Hope this helps for now and one can give you a more qualified or detailed information on that