[David Solito]

Hello,

I dont' know if the wish already exist, but i was thinking about it during a render process with SSS.
From a typical Studio Hdr, i made several version off it in photoshop (masking some light). I made 3 versions (in other words making a file from each light in the hdr image.)
So it should be more easy to launch a render with the 3 illumination file and adjust them like multilight that making 3 render and compose them in post.

[Tok_Tok]

Yes! a multilight HDR image. Would be great. Maxwell still renders the fastest on IBL so support for this is centainly not a bad idea.

But isn't this already possible with MXI's that are rendered with Multilight on? Don't know how you would compile a 360 environment into 1 MXI...
Anyone tried this?

[Mihai]

You could do it this way:
Enclose your scene in multiple spheres (as many as you want for different IBL images), with inverted normals. Each sphere slightly larger than the other so they don't share the exact same space when emitting. Create a normal 1 BSDF material for each, set the BSDF as 'ghost' (transmittance 255, ND 1). Add an emitter component, load the HDR in the emitter. You'll get ML sliders for each emitter sphere and can turn them on/off as you wish, also blend the light from each HDR. This way though you won't be able to load different maps for different channels (reflection/illumination etc) but it gets you pretty close to what you want. Since the materials have a ghost bsdf, they won't block the light from the other spheres. Ofcourse together with this you could also use the IBL environment lighting so at least you could use different maps for that.

[David Solito]

Thanks Mihai.

But is my request a day possible?
Why Is IBL faster than emitter?

[Mihai]

I'm not too sure why it's faster But from what I understand it's because the light is coming from all directions which makes it more probable for rays to reach the camera and 'develop' the image. Imagine a tiny emitter lighting the whole scene, rays are sent from only that emitter and eventually some of them reach the camera. But until they do it will take a lot more bounces and so time.

I think this request could be possible, but will not save you very much time from what I described above, you'll gain the possibility of having different maps for the different channels if that's something people use a lot....