Cineversity

Hi. Im working with an animation and the texture on it dances. I assigned a noise shader to the color channel of the texture. I set the scale of the noise shader really low to around 2% which is why I think it is moving around from frame to frame? I tried applying a stick texture tag but that did not fix it? Any suggestions would greatly be appreciated?

Thanks

Joel Hebert

Hi Joel Hebert,

Is your Anti Alias setting Geometry perhaps, the Noise shader Space to anything else than to Texture, or ...?

A scene file would help here, to see what you set up is.

The Value of 2% is always relative to your scene set up, if the camera is close or far away for example.

It might help to change the MIP settings…

Without a scene file, it leaves question and guessing ;o)

All the best

Sassi

Dr. Sassi,
Here is the file. Thanks

http://joelhebert.com/wp-content/uploads/2012/04/Joel-Hebert-for-cineversity.zip

Joel H.

Hi Joel,

First off, please reduce scenes when sharing them.
In this case a sphere with one of your offending textures and lights would suffice to describe your problems.

So Dr. Sassi is 100% correct in his assertion that the issue here is in the AA settings.
For starters your scene was set to geometry, this only adds AA on the edges of objects.

To demonstrate I deleted all objects but left the lights and cameras, I then went into the “top piece glossy” material and turned off all channels except for the color.
In the layer shader I disabled the overlay to produce brighter noise.

so here we have your base settings:
http://dl.dropbox.com/u/8306001/JH_base_settings.jpg

then we turn on “best” in the AA settings:

http://dl.dropbox.com/u/8306001/JH_step_01.jpg

this looks better but it is not what your noise actually looks like.

Take the threshold value from 10% and set it to 5% (If you have watched the physical renderer videos this is the same concept as the sampling explained in those videos.)
You get this:

http://dl.dropbox.com/u/8306001/JH_step_02.jpg

where did the noise go? Well now that the surface is finally getting enough samples you are seeing what your noise really looks like. Now try 2%, most of the image will now be recieving 4x4 sampling, but the results look even smoother.

http://dl.dropbox.com/u/8306001/JH_step_03.jpg

So now you go back into your noise shader and bump up the scale and you get something like this…clean predictable noise. In this case I set the noise scale to about 10%

http://dl.dropbox.com/u/8306001/JH_step_04.jpg

Now, you’ll probably notice that the edges don’t darken as much once the noise is scaled up…so you will likely want to multiply a little fresnel shader in there.

Thank you for the advice Patrick. I will look into all the suggested settings…and sorry the file was sent so large, I will package it better next time.
Joel H.