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HDR + SUN (reboot the subject !)

Posted: Tue Jan 12, 2021 8:54 pm
by Lebenzet
The topic has many time been discussed. I know.
But I don't understand why you basically don't unable the possibility to activate the SUN when using HDR image in lighting field (image based).
Physical Sky is a combination of a Sky (which works like a HDR soft lighting) and a SUN which projects strong parallel light. It is very clear when we use multi light.

I don't understand why it is so difficult to have the possibility to use a HDR instead of the SKY and have the SUN active. And without manipulations like create a manual sun or a ghost sphere with a HDR material around the scene ?
The SKY is great but it is flat (no clouds, no variation of color, etc...)

This would be a great new feature !!!

Re: HDR + SUN (reboot the subject !)

Posted: Tue Jan 12, 2021 11:55 pm
by Mark Bell
Yes, I agree and from memory, v1.6 and earlier had this feature and it was great to use a real sun in combination with an image/photo as a backplate. I'm not sure what the reason was to change this when v2 came out but it did remove the simplicity that was already there with the previous version. May be some more experienced users can add to this?

Re: HDR + SUN (reboot the subject !)

Posted: Wed Jan 13, 2021 12:58 am
by Forester
Well, one potential problem is that most HDRI files that feature a sky, already have a "sun". That is, a "hot spot" where much of the light originates. So, you have a strong possibility of having "two suns" in many of the HDRI files.

Re: HDR + SUN (reboot the subject !)

Posted: Wed Jan 13, 2021 4:12 am
by LadleSky10
Perhaps an option (manually or by default) to lock the sun's orientation to the brightest pixels in the HDRi image?

:D

Re: HDR + SUN (reboot the subject !)

Posted: Wed Jan 13, 2021 1:13 pm
by Andreas Hopf
Procedural clouds like in the Alias renderer introduced 1991 would be nice :mrgreen:

With today's coding possibilities, generating credible clouds would be no problem, or is it?

Re: HDR + SUN (reboot the subject !)

Posted: Wed Jan 13, 2021 11:51 pm
by Mark Bell
Andreas Hopf wrote:
Wed Jan 13, 2021 1:13 pm
Procedural clouds like in the Alias renderer introduced 1991 would be nice :mrgreen:

With today's coding possibilities, generating credible clouds would be no problem, or is it?
Great idea and I recall this being tabled before so hopefully it gets added onto the 'to do' list....

Re: HDR + SUN (reboot the subject !)

Posted: Thu Jan 14, 2021 11:53 am
by Andreas Hopf
This is what it was back then. Still got the Indigo2 and Octane somewhere in my cellar, lol.

Image

Re: HDR + SUN (reboot the subject !)

Posted: Wed Jan 20, 2021 4:48 pm
by choo-chee
huh.... I asked for Artlantis render sky options years ago.... with a few simple sliders to control the shape, density etc. of the clouds.

Re: HDR + SUN (reboot the subject !)

Posted: Thu Jan 21, 2021 5:21 pm
by seghier
Lebenzet wrote:I don't understand why it is so difficult to have the possibility to use a HDR instead of the SKY and have the SUN active
Did you try to change illumination to Active Sky under Image based tab?