color banding

[jonnybefree]

Hi,
i have problem with displacement here.
i'am rendering a Zdepth from an object in max, wich i'am using as displacement map for a plane. cause the client want an emboss-like effect from that object.
but when i render out the Vray-zdepht, i get color banding in it, wich is visible in displacement.
i don't know if its really a Vray Problem. cause i get same with MR and scanline.
in vray and MR its circular, and in scanline its horizontal...
i try'd to render out a 32bit floating point, but same result.

here is a example what its look like:

http://www.jonas-balzer.de/VRay/DisplaceColorBanded.jpg

does anybody an idea how to avoid this?
i try'd to blur in PS. but no luck. when blur in max the edges getting unsharp too of course wich i don't want...

any ideas?

thanks in advance and best regards

Jonas

[raymarcher]

try to put a relax modifier on it?

[vlado]

You need to use a 16-bit output image format (e.g. PNG), or floating-point (e.g. OpenEXR).

Best regards,
Vlado

[jonnybefree]

You need to use a 16-bit output image format (e.g. PNG), or floating-point (e.g. OpenEXR).

Best regards,
Vlado

hi Vlado,
i try'd to render out as .exr 32bit floating point.
but was same result...

[vlado]

How did you produce the .exr?

Best regards,
Vlado

[jonnybefree]

i've renderd out a vrimg, and converted it to .exr

[jonnybefree]

no stop, sorry.
i've try'd it this way, but i was too stupid.
i've said "split render channels" and saved zdepht as 32 bit exr seperately.

[vlado]

No idea then; perhaps you can try to play with the min/max zdepth settings to increase the precision of the file.

Best regards,
Vlado

[jonnybefree]

ha,ok. stop again. sorry i've render again an exr. it seems to work..
i dunno why. but it works. displacement map is 400MB. but it works