Highlights from lights flickering on reflective materials.

[jfharper]

I'm getting some dancing of my light highlights on my objects with vraymtl with relflect at white...when I turn off affect reflections on my two vray lights in the scene the highlights go away and so does the dancing...is there any to keep the light highlights in and fix the dancing?

 

I'm also experiencing noise dancing on my reflections...I can reduce it by turning Max depth down to 1, but then the object is not reflected properly in the reflections of nearby objects...for example, I have a table that has a black diffuse and reflect at white...on the table is a faucet with a chrome material...the chrome is reflected in the table, the chrome has the noise dance while the table does not, so I turn max depth to 1 for the chrome and the noise dance is reduced a lot, but then the chrome is not reflected like chrome in the table...the chrome is reflected like a flat gray instead of looking like chrome from the table's reflection...can some offer some advice?

 

I am using GI, (HDRI map for enviroment...tried turning that off with no change) have IR map as pri and brute force as secondary...nothing else in the scene is flickering and I have my IR map pre-calculated as a multiframe increment...but both the light highlights and chrome relfection noise is dancing around so I don't think these are related to teh GI or lighting...they are material based but I don't know what to do...the only other thing I can think of is add some relfection blur (refl. glossiness) but this increases render times too much, and since I'm doing dof in post, it blurs alot already so I don't need to worry about blurring the relfections...I'd just like to get the light highlights and chrome relections to stay put...without dancing.

[jfharper]

OK, I played around with a bunch of settings, the only thing that had an effect was turning the max depth down to 1 or 2 in the reflection group in the material...then I played with setting in the renderer and when I increased the max rate to 3 from 2 for the adaptive subdivision image sampler, the noise went more smooth...I haven't rendered yet to see if the dancing go away but this had an effect...should I go with a different image sampler other than adaptive sub?

[Francisco Penaloza]

Hi,

can you post an image to have a clear idea of what type of reflections are you talking about??

When you have bouncing shadows or glossy sparkles in your scene can be because of GI and samples in your material.

The ones created by GI usually are big splotches, the ones material related usually are small, like noise type, (not all the time but usually)

To control this VRAy have 3 general options;

Quality in your GI

Image sampling (Antialising) tat work with DMC Sampler

Sample in your material

 

Now for animation if you don't have animated object I would recommend to use Irradiance and Light cache, Brute force as second bounce is nice, but it take long time to render clean, and also it is easy to get those sparkle bouncing reflections, if you are not using a high number of subdivs, depending of the scene can be 24 or so.

Your material is 100 reflective or do you have some blurry glossiness on it??

 

in You HDRI I guess you are using a VRay dome light, if so try to check the box store with irradiance map, that can help to smooth the thing ups, its interpolate a little extra but if you have a good Irradiance map is not that noticeable.

 

let us know if this help

[Tommy L]

Post an example, but it may be the subpixel mapping checkbox fixes it (if its little white speckles).