Fix blackbody node to support temperatures down to 800K#2831
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jstone-lucasfilm merged 1 commit intoAcademySoftwareFoundation:mainfrom Mar 26, 2026
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niklasharrysson
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Mar 25, 2026
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This looks great! Thanks @zeel2104
jstone-lucasfilm
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Thanks for this contribution, @zeel2104!
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Summary
Fixes #2827
Extends the blackbody node temperature range down to ~800K (the Draper
point) from the previous lower limit of 1667K.
Changes
xc polynomial covers 1000K–4000K with the same formula, so the old
limit was unnecessarily conservative. Merged the two redundant xc
branches into one.
Testing
Verified the output chromaticity gradient from 800K–6504K is physically
correct and all temperatures below 1667K now return distinct colors
instead of being clamped to the 1667K value.