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I thought I better seek help from others to make sure I'm not making a user error here before placing a bug report.

In using greyscale displacement maps (textures) in blender 2.80 I've noticed something seems to be going wrong with the way 2.80 reads the information in the image files.

As you can see image the comparisons below, 2.80 using the same 16bit tif displacement image results in what looks similar to bitdepth gradation banding lines/artefacts. 2.79 renders the displacement smoothly whereas 2.80 no matter what I do always has those ugly ridges/lines.

A bit about the setup:

1 plane, gloss shader (nothing plugged into it, roughness at 0)

world hdri from HDRIhaven "greenwich park" 2k

displacement map from poliigon freebies "TilesRectangularMirrorGray001"

displacement map plugged straight into displacement output (note: also tried in blender 2.80 plugging disp map into 'displacement' node then into displacement output, no improvement) (note: tried both color and non-color options for image-file node, no help)

material set to "bump only" in 2.80 (note: also tried displacement+bump , displacement only in 2.80, including turning on experimental adaptive subivision, did not fix)

16bit source displacement texture 2.8 vs 2.79 enter image description here

Note: 8bit 2.80 vs 2.79 appears similar in level of banding

8bit source displacement texture 2.8 vs 2.79

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  • $\begingroup$ It looks like you are using true displacement is 2.8 (due to what looks like an underlying mesh having been messed with), does applying a subdivide to the model change anything? $\endgroup$ – Kirbinator Apr 23 at 17:29
  • $\begingroup$ Unfortunately not, the effect is still present with high subdivisions + displacement & bump. The problem seems to be in the way 2.80 is using the 'bump' portion $\endgroup$ – Tim Bahrij Apr 24 at 5:04
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    $\begingroup$ I had this issue several times too, I figured out that it happens due to compression of the texture as many values will be set to the same to reduce space. $\endgroup$ – DrachenSeele Apr 26 at 10:16

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