Bump Mapping has been broken since Aug 2018 #62889
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Reference: blender/blender#62889
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System Information
Operating system: Windows 10 Home (with current updates)
Graphics card: GTX 1070
Blender Version
Broken: HASH:
f86c965d7fDATE: August 8th, 2018 Version: v2.79.6Worked: HASH:
b85be88655DATE: July 16, 2018 Version: v2.79.5Short description of error
Bump mapping is broken for Cycles. For the example provide, an .exr height map set to Non-Color Data is plugged into the Height input of the Bump node with the Normal output of the Bump node plugged into the Normal input of the Diffuse BSDF node.
Exact steps for others to reproduce the error
Open the attached .blend and activate the Cycles render engine.
Here's the .blend bumpMapBroken.blend
Here's the node setup that is used for all of the attached images.
This next image shows the last version that I can identify where bump-mapping still works. (2.79.5 HASH#
b85be88655)Next we have a version where bump-mapping is badly broken. (2.79.6 HASH#
f86c965d7f)The final image shows the current state for bump-mapping for both 2.79.7 HASH#
d7cecc2ba3) and 2.8 as of March 23. It's still noticeably broken but the error is not as obviously as it was before.For reference, a render where bump-mapping still functions correctly. Ignore the notes about noise, it's unrelated and irrelevant. (Official 2.79b HASH#
f4dc9f9d68)Added subscriber: @MarcClintDion
Added subscriber: @brecht
Changed status from 'Open' to: 'Archived'
We changed bump mapping to avoid certain types of black artifacts, and this is such a case.
If you have a white skydome above a plane, bump mapping is not supposed to add darkening. Light is coming from all direction, so no matter which way the normal points it's still supposed to be lit.
I should have tested this further before saying anything, the torus just looked so wrong but I think that's because I was using a model that had a depth that was far too dramatic for bump/normals.
I built a quick model that's more appropriate for bump/normal mapping and the results are actually fantastic. The weird toon lines that used to show up are gone and there is now a view-dependent highlighting that gives a substantial illusion of depth. I fully retract my complaint. I'm sorry for wasting your time.
(i)The old code with the weird toon line and flat highlighting
(ii) The new code
This comment was removed by @MarcClintDion
Here's the shader setup I used to create the height map in case anyone working on code wants to bust out custom height-maps for testing purposes. There's a .blend file as well. Any model baked into the height map must simply have the material applied that is named "height" then press f12 for standand camera rendering. There does not seem to be much benefit to rendering more than 8 samples for Emission. That's enough to get perfect anti-aliasing at moderate resolutions. The saved image should be saved as either 16-bit per channel png/tif or some floating point image like exr/hdr.
The following is the original image for the node setup for anti-aliased, orthographic camera baking that I pilfered from BlenderArtists.org eons ago. I forget who configured it. Feel free to claim it here if it's you.
FYI. The height value used in the Bump node matches the height for the model that is captured in the height map. In this case, the model is 0.1 units along the z-axis and the bump node of the rendered height map also has a value of 0.1 for it's height. It works well if they match.
draft_1.blend
This comment was removed by @MarcClintDion
The ground truth is displacement, we have tests to compare how close they are.