On 16/11/2017 22:48, Kenneth wrote:
>>
>>>>> Is there a way to light the room with HDRI?
>>>>> Maybe just surround the room with one and add no_shadow?
>>>>
>>>> I'm not too keen on that idea. I don't think it would work with three
>>>> walls of mirrors.
>>>
>>> I think you miss my point -
>>> I was thinking about using the HDR _only_ as a light source - the
>>> image wouldn't be visible in the scene at all (unless you had windows).
>>
>> I still don't see it for an inside scene. Not going from the HDR images
>> I've seen. But if you can find what looks like a suitable one. I'll give
>> it a go.
>>
> 
> Clipka wrote...
>> HDRI illumination is just a poor man's substitute for a proper scene. So
>> if you already have a complete room, there's no point in using HDRI for
>> illumination. (As a matter of fact it would be counter-productive, as it
>> would illuminate the objects in a way that wouldn't match the scenes.)
> 
> I'm still a virgin when it comes to trying out HDRI... but Clipka's comments
> raise some questions for me (or else/maybe they clarify something that I've
> always wondered about.)
> 
> My assumption of HDRI has always been that it's basically meant to take the
> place of scene lights-- and that it's *most* useful for Sun-lit scenes-- i.e., a
> light probe image with the Sun actually visible. (OR, something like an indoor
> light probe with several candles as the only illumination.) And that the
> rendered scene uses the MUCH-brighter Sun (or small candle flames) *as* the
> *distinct* light source(s)-- those sources naturally casting scene-object
> shadows as if they are actual bright lights-- and with the rest of the light
> probe image functioning more or less as a straight environnment map, for the
> remaining soft lighting. (Like typical radiosity results when using a
> low-dynamic range image on a large sphere.) In other words, the only real reason
> for an HDRI light probe would be for its VERY bright lights, relative to the
> rest of its image.
> 
> That's my own naive understanding, anyway.
> 

Mine too.

> For an enclosed room like the dance hall, it seems to me that a typical LDR
> image-plus-radiosity would give equally realistic results (unless the room
> contained a SUPER-bright light somewhere.)
> 
> 
 From what I've seen of studios. They are either at the top of a 
building with large windows and maybe two mirrored walls. Or have no 
windows and rely totally on artificial light. Giving a even a light as 
possible.
I don't think it would work in this scene. But if you find one that 
could be appropriate. I'll run it overnight.

-- 

Regards
     Stephen

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