Compositing float images in Combustion lost the float datas?

V-Ray V-Ray Common Off-topic
1

I m was making some tests in Combustion in order to blend exr 32bits images exported from a vrimg file.

So I did diffuse x rawGI and then ADD the rawLighting.

diffuse x RawGI result is OK : it is still a floating point image since I have on it brighter area than 1.

BUT… :lol:

Then when I ADD the rawlighting pass, the result is clamped = no more brighter area than 1 :cry:

Is this normal?

2

yes :frowning:

Forced us to go APPLE + shake 3.5 to comp exrs that came out of Maya and Mr.

YOu can try also alpha premult on an rpf or exr: that clamps to one too.
SO silly.

But it can be wroked, it just needs some patience, and a DIFFERENT format (all the way to 4.03 the issue is still there, and not looking a good candiate for a solution…).

Lele

3

The alpha premultiplication stuff is real crap. It can be avoided to some extent using matte controls, like erode or blur instead of premultiply.
But I agree with you, it’s awful how combustion deals so poorly with this -important- issues.

4

yeah, Erode is king in combustion, lol

“What’s that fringe there?” “Which fringe?”
“Mmmh, and what’s that black gap, now?”“Which black gap?”
“but now the fringing is back!”“Which…”

:lol:

for i in combustion.version.number where basicstuff.cannot.be.done say(
discreet combustion == polite fart
havealaugh(i)
gc()
)

Lele