[Solved] Colour Corruption in Material Editor

Development Rendering
1

I cannot for the life of me work out why what I’m doing below is a problem, and I’m 99.99% sure I’ve stumbled accross an engine bug but need someone to sanity-check it for me first.

The vehicles in my game have a bunch of masks (all textures use TC_Masks compression setting), which allow me to control various emissive parameters in their materials. I use this for things like weapon muzzle glow, engine overheating etc. One of my material functions that I use is causing me headaches with colours.

This material function let’s me mask in a ‘colour’ for four different channels separately. Pretty basic right? Below it is the MF_MapRange function - which is just supposed to scale scalar values from one range to another.

fe2f021c5fc43694208775258391074cbc8f8a9c.jpeg

MapRange.JPG
MapRange.JPG1005×542 73 KB

However, the Map Range function seems to be confusing the Shader Compiler when used inside another material function like this, and it can’t seem to deduce the channels properly. Currently if I have this node plugged into my chain of nodes up to the emissive channel, it causes the following colour corruption:

7118de7a4f849df0bd45f54b8ff11367b7210170.jpeg
d578abc5dfd8c2dab7f7c50900912835f9eee24d.jpeg
6dfdd34f0d6f2624f1f7db90ac6a62bca5eb152d.jpeg

I have to drive the emissive parameters much harder too. If I unhook MapRange from that material function, everything works as it’s supposed to - but this makes no sense? I even tried adding a Mask (R) node after the MapRange node, but that still didn’t work.

HackFix.JPG
HackFix.JPG1665×594 120 KB

CorrectGlow.JPG
CorrectGlow.JPG1209×887 76.3 KB

^ What it’s supposed to look like.

In short, I think the engine is unable to correctly deduce channels for colours when material functions are used inside other material functions - since I really can’t see anything I’m doing wrong here.

2

Jamsh, are you sure that remap function is working as intended? Try checking it with DebugScalarValues node(Big thanks to whoever added these debug nodes to the editor) , it seems to me that it is not remapping stuff correctly. Cross-check it with something like this:
[SPOILER]


Begin Object Class=MaterialGraphNode Name="MaterialGraphNode_38"
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      Input=(Expression=MaterialExpressionFunctionInput'MaterialGraphNode_40.MaterialExpressionFunctionInput_7')
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   Begin Object Class=MaterialExpressionComponentMask Name="MaterialExpressionComponentMask_22"
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   Begin Object Name="EdGraphPin_4932"
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End Object

[/SPOILER]

As a side note, remapping 0 to 1 range into -1 to 1 range can be usually simplified to multiplying by 2 and subtracting 1

The only version of how can i explain the green color bleeding, where you expect only orange, lies in the fact that MF_WeaponsGlow is returning negative value and somehow subtracts the (12, 0.5, 0.2) color part, instead of adding it.

3

Dangit! negative values… that was the ticket. It’s the remap. I’m clamping the output, but it’s being clamped to -1 by the ‘output range’ and is indeed subtracting colours.

The reason for the more complex logic in the remap function is because sometimes I want to range to completely different values etc. With this done though, I should be able to fix the problem now. Argh! Thanks for the nudge!