strange displacement

[deneb26]

hi there

i've some trouble with a displacement map causing some strange 'shifting' patterns. before i loose any words, please take a look at the rendering.
as you can clearly see, there is some strange thing going on.
the disp-map is always the same (some copy/paste withing the texture itself to make it larger). this should'nt happen, because the map got a alpha channel with sharp edges/cutouts (no smoothing or the like).
btw. the disp-map is 32Bits. no texture-map filter is applied within the vraydisp-modifier. the resolution is set accordingly to the displacement map. Precision is set to 8 (default i think). i'm on Max 9.0 64bit and vray R1.5 SP1
could someone please help me out with this, it's really urgent (what's not).
thanks
ale

rendering:


disp-map (downscaled without filtering)


zoom-in of the disp-map

[vlado]

Are you using 3d or 2d displacement? In the first case, try decreasing the edge length, and in the second - increasing the resolution for the displacement.

Best regards,
Vlado

[deneb26]

hi vlado

i'm using 2D displacement.
jep, i was already increasing the map-size.

thanks.
ale

[Codi]

Have you tried to disable the MAX texture filtering?

Edit: yeah you already did ^^

[Neilg]

Shrink your opacity map by 1px, so it cuts into the mesh a little more. Either that or smooth the black section out in your displacement map so it doesnt cut straight to black.

[deneb26]

thanks guys

to Codi: i rarely use max-filtering, i mostly set it to none.

to cubiclegangster: the opacity map already was 1 pixel 'smaller', thanks anyway.

[JohnVK]

Hi Ale,

Have you tried setting the bitmap map Blur value to the smallest possible value (0.01)? This also causes some irradic behaviour in my displacement maps from time to time.

[trixian]

This looks like a "view dependant" issue. Try with it off and define the edge length in scene units.

[deneb26]

thanks again guys.
it seems i'got it solved somehow. sure the map-size did matter alot.
i will consider your tips for further tests.

have a nice evening.
ale