Bump node : height input value bug #45748

New Issue

mathieu auvray · 2015-08-10T15:01:48+02:00

mathieu auvray commented

2015-08-10 15:01:48 +02:00

Investigating another bug related to panoramic cameras (https://developer.blender.org/T45721) we've discovered that bump nodes are not working like before.
Adding two bump nodes doesnt work. The Bump node needs a value or an RGB input into the height to work.

Here is an exemple :

and the file that goes with it :
bug_cycles_bump_node.zip

In this file you can see the suzanne on the left has a bump, and the one on the right doesnt. It's the same shader with two bumps plugged into the normals. In the official build (2.75a), bump still works on the right one...

tested on windows 7 with blender build 65c3207

Investigating another bug related to panoramic cameras (https://developer.blender.org/T45721) we've discovered that bump nodes are not working like before. Adding two bump nodes doesnt work. The Bump node needs a value or an RGB input into the height to work. Here is an exemple : ![bump-node.jpg](https://archive.blender.org/developer/F222816/bump-node.jpg) and the file that goes with it : [bug_cycles_bump_node.zip](https://archive.blender.org/developer/F222822/bug_cycles_bump_node.zip) In this file you can see the suzanne on the left has a bump, and the one on the right doesnt. It's the same shader with two bumps plugged into the normals. In the official build (2.75a), bump still works on the right one... tested on windows 7 with blender build 65c3207

mathieu auvray commented

2015-08-10 15:01:48 +02:00

Changed status to: 'Open'

mathieu auvray commented

2015-08-10 15:01:48 +02:00

Added subscriber: @MathieuAuvray

Aaron Carlisle commented

2015-08-10 16:05:07 +02:00

Added subscriber: @Blendify

Dalai Felinto commented

2015-08-10 17:37:47 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2015-08-10 17:37:47 +02:00

Confirmed. It happens regardless of the lens type (perspective/panorama).
The example file is here as well as plain .blend: bug_cycles_bump_node.blend (packed the image and saved as compressed from within Blender)

Confirmed. It happens regardless of the lens type (perspective/panorama). The example file is here as well as plain .blend: [bug_cycles_bump_node.blend](https://archive.blender.org/developer/F222880/bug_cycles_bump_node.blend) (packed the image and saved as compressed from within Blender)

Thomas Dinges was assigned by Dalai Felinto

2015-08-10 21:12:39 +02:00

Dalai Felinto commented

2015-08-10 21:12:39 +02:00

Added subscriber: @ThomasDinges

Dalai Felinto commented

2015-08-10 21:12:39 +02:00

That seems to be by design (introduced here: b6665937) @ThomasDinges what do you say?

That seems to be by design (introduced here: b6665937) @ThomasDinges what do you say?

Dalai Felinto commented

2015-08-10 21:18:04 +02:00

@MathieuAuvray I guess you know the workaround, right?

@ThomasDinges if we stick to this commit I think we should to at least mention it in the release logs (http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.76/Cycles)

@MathieuAuvray I guess you know the workaround, right? @ThomasDinges if we stick to this commit I think we should to at least mention it in the release logs (http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.76/Cycles)

Thomas Dinges commented

2015-08-10 21:23:58 +02:00

I don't understand the reason of that node setup? Why would you use 2 Bump Nodes right after another?

I am fine with documenting this, however I don't see a bug here (yet). :)

I don't understand the reason of that node setup? Why would you use 2 Bump Nodes right after another? I am fine with documenting this, however I don't see a bug here (yet). :)

Ronny G commented

2015-08-11 13:13:26 +02:00

Added subscriber: @nudelZ

Ronny G commented

2015-08-11 13:13:26 +02:00

large and small scale details for example dingto

head -> bump 1 wrinkles -> bump 2 skin pores etc

but it isn't really a bug i would say. who uses a bump node without a height value (?)

large and small scale details for example dingto head -> bump 1 wrinkles -> bump 2 skin pores etc but it isn't really a bug i would say. who uses a bump node without a height value (?)

Thomas Dinges commented

2015-08-11 15:27:42 +02:00

Changed status from 'Open' to: 'Archived'

Thomas Dinges closed this issue

2015-08-11 15:27:42 +02:00

Thomas Dinges commented

2015-08-11 15:27:42 +02:00

Sure, you can still use 2 Bump Nodes (or more) with different values, but you need to have the Height Input connected to something.

In the screenshot example, the second bump node does nothing, it just acted as a pass through before, now it gets removed from the graph.

Sure, you can still use 2 Bump Nodes (or more) with different values, but you need to have the Height Input connected to something. In the screenshot example, the second bump node does nothing, it just acted as a pass through before, now it gets removed from the graph.

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Bump node : height input value bug #45748