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Maniphest T49801

Normal Map node is not working correctly
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Description

Ubuntu 14.04 64x
nVidia GT620

Broken: 2.78
Working: none ("Normal Map" node is a new feature)

"Normal Map" node should apply a normal texture map to an object the same way as it is done by texture stack (no nodes), but it doesn't.

  • Open the file.
  • Look at both ships.
  • The one of the left ("with_nodes") has nodes material, using a texture called "normal", with Normal Map node connected to Normal input of the material.
  • The one of the right ("no_nodes") has a Normal Map applied in Textures stack, as is had to be done before.
  • See the difference.
  • In object "with_nodes", try clicking the other Output, it makes the ship "with_nodes" to have the same material as "no_nodes". You can see the difference in the same object.

The difference is more or less notorious depends on light(s) positions. In layer 11, there's only one Point light to test.

99-nave-test-bug.blend1 MBDownload

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Event Timeline

Mario Mey (mariomey) created this task.Oct 20 2016, 2:34 PM
Mario Mey (mariomey) updated the task description. (Show Details)
Bastien Montagne (mont29) added projects: Cycles, BF Blender.Oct 21 2016, 2:59 PM
Mario Mey (mariomey) added a comment.Oct 21 2016, 9:41 PM

Despite I know that this node cames from Cycles, this report is about the incorporation of it in BI and ViewPort.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Archived.Oct 22 2016, 12:21 PM
Brecht Van Lommel (brecht) claimed this task.
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

This is not a bug though confusing. For node setups, you must manually set the color space of the image to Non-Color in the image editor. The texture stack does this conversion automatically, but for arbitrary node setups we currently have no way of doing that.

Mario Mey (mariomey) added a comment.Oct 22 2016, 5:34 PM

Just as it is. Thanks.

One more thing: if I use new depsgraph (I use it for a need and for testing it), the change of the color space is not applied immediately (I have to click in the another Output node and then back)... I found a lot of this kind of new-depsgraph bugs. Should I report as a bug... or they are already working on this non-auto-refreshness?

Brecht Van Lommel (brecht) added a comment.Oct 23 2016, 1:30 AM

I think such issues with the new depsgraph can be reported as a bug. They might only get looked into for Blender 2.8, I'm not sure, but definitely useful to know about them.

Mario Mey (mariomey) mentioned this in T49826: NEW-DEPSGRAPH - Texture is not updated after changing its space color.Oct 23 2016, 9:10 PM
Mario Mey (mariomey) added a comment.Nov 4 2016, 4:46 PM

@Brecht Van Lommel (brecht), someone made a "Bump_to_normal" node setup, to convert a bump map in normal map, with some nodes. This setup works to make normal texture, but not for using it as normal map. Why? Because the color space isn't set up. It works as a NormalMap texture with sRGB (bad).

Is there any way to change the color space of an image built by nodes? By changing the Bump Texture to Non-Color doesn't do anything in the final composition.

Here is the example:

100-space-color-node.blend2 MBDownload

  • Open the file, look at the node setups.
  • The above is using a Normal Map (like the first one of this report)
  • The below is trying to use Bump_to_normal.
  • Click on Outputs to see the difference.

Sorry if this comment is just a question... but it is related to this bug.

Brecht Van Lommel (brecht) added a comment.Nov 4 2016, 11:05 PM

If the images input into the shader network are linear, and you manipulate those values and link the result directly into a Normal Map node, then I'm not sure how you can end up with sRGB values unless the shader network is explicitly doing that conversion.

The shader network in this .blend file contains a Gamma node, which seems wrong to me.

Jean Da Costa (jeacom256) added a subscriber: Jean Da Costa (jeacom256).Jul 14 2017, 3:18 PM

Well, maybe add a description for the node explaining this.

Brecht Van Lommel (brecht) added a comment.Jul 14 2017, 3:32 PM

It's documented in the manual.