So I was house-training a budget work-lamp I'd found on CGT.
https://www.cgtrader.com/3d-models/...85-79976b11720d
It included a nice 4k texture map for body & LEDs, with a separate material zone for the front glass, to be set almost transparent.
So I loaded the map into free Irfan View, painted all but the LED zone black, re-saved as an ambiance mask.
Looked okay until I dialled up the ambiance to ~99, at which point a patch on top of the case lit.
Huh ? WTF ?? That's not right...
An exasperated hour of re-mapping and sundry iterations later, I came back to that texture mask and played a hunch. I 'inverted' its colours. Yeah, sorta-diagonal from the LEDs' now-black rectangle, there was a pale grey smudge on the white field. A very pale grey smudge which, before inversion was, to the eye, indistinguishable from black...
Gotcha.
Re-painted, the mask now played nice.
I don't know how that patch slipped through, but lesson learned...
Huh ??
Huh ?? |
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Last edited by Nik on 20 Aug 2021 15:04; edited 1 time in total |
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Huh ?? |
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Not a brilliant render, but a useful test of the super-ambiance in action.
Superfly, 128 pixel-samples, an hour on 'Box'... Last edited by Nik on 20 Aug 2021 17:08; edited 1 time in total |
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Wow, really, a little smudge like that can throw the mask a curve ball like that :mmmh: ? Thank you kindly Nik :thumb: !
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