(7.4.1, Unlit Graph, URP) Color picker and preview is incorrect when toggling "Exposed" and "HDR"

Unity Engine
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1

I am in Linear color space for my project. I don’t know if this matters but it might be important information.
Project specs: (7.4.1, Unlit Graph, URP).

I found this bug while using a script to set a Global color. My script has you set a non-HDR color, but the shadergraph was reading this color as HDR (Even though in shader graph the color’s mode was set to Default, not HDR), so the results were off. I fixed it by making my script let you set an HDR color, but that seems non ideal.

Reproduction:

  • Create a color
  • Drag its output to a preview node. The output is correct.
  • Change the default color to 6F3434
  • Uncheck “Exposed”.
  • The color picker appears as regular, but the previewed color is now wrong…
  • If I set the color to a RGB to Linear node, the color appears correct.
    See below:

6129194--668180--upload_2020-7-25_9-18-31.png
6129194--668180--upload_2020-7-25_9-18-31.png918×686 26.3 KB

  • If I toggle Exposed back on, the preview is correct again.

6129194--668183--upload_2020-7-25_9-19-56.png
6129194--668183--upload_2020-7-25_9-19-56.png920×574 25.7 KB

  • If i then set the mode to HDR, the “Default” color updates, but the preview is wrong, UNTIL I toggle Exposed OFF again (and if I toggle it back on, the preview is correct)

6129194--668174--upload_2020-7-25_9-7-6.png
6129194--668174--upload_2020-7-25_9-7-6.png765×259 26.4 KB

2

I just want to summarize that one of the bigger issues here is that an unexposed color property in an URP Unlit graph behaves as if it’s always in HDR mode, even if it’s set to default, which requires me to work around by having the script setting the color property take an HDR color (even if I don’t need to do that).