Re: Possible New Bug With HDRI?...Please Help... 2004-04-20 - By David Bell
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Claudia,
I have almost always had to back up HDRI illumination with a key and a
fill light, and not just in Carrara. The movies have spoiled us, our
concept of natural light is skewed.
Yours,
David
On Tuesday, April 20, 2004, at 01:33 PM, ccoles_avengers wrote:
> Hello Holly,
>
> After I sent this message I hacked around for quite a while with the
> file (it was *really* late at that point) and noticed that the GI was
> turned off. So that was one of the main problems I was running into
> [I hate when that happens]. So I apologize for the alarm, but thanks
> for the response and tip about the ambient light because I didn't know
> about that at all.
>
> However, could you please tell me if I am on the right track with
> this; I think I am finding out why things that were "shiny" under
> conventional light appear "dull" under HDRI. When I use spot lights,
> I use a combination of shininess and highlights to set the specular
> highlight of an object. I do this to communicate the type of
> smoothness that the surface of the object has. However, I am noticing
> that this characteristics disappears when I use HDRI. In order to get
> close to what I had before (that is to show a "shiny" or smooth
> characteristic of an object), it seems that I have to set a little bit
> of relection in the texture in order to bring this out when using an
> "overcast" type HDRI map. Is this notion correct or should I still be
> able to get specular highlights with an overcast HDRI map? Also, if I
> were to use an HDRI map that would contain direct sunlight
> information, would the shininess and highlight be visible like it was
> under the spot light, without using reflection?
>
> Thanks again for your help.
>
> Claudia
> "Selocic"
> (a newbie)
>
> --- In Carrara@(protected), "hdaggers2000" <hdaggers@(protected)> wrote:
>> Claudia,
>> Be sure to turn on Global Illumination in the Render room (under
>> the Rendering tab). Also, you will get better results by turning off
>> all ambient light (by selecting SCENE in the assemble room and
>> sliding Ambient light to 0%). You may even want to delete the
>> Light in your scene to have the HDRI as the only light source.
>>
>> I rendered under your settings and got the same results you did.
>> Without GI turned on the HDRI is only acting as background
>> image and reflection map, not as a light source. Expect
>> increased render time.
>>
>> Hope that helps.
>> holly
>>
>> --- In Carrara@(protected), "ccoles_avengers"
>> <ccoles_shado@(protected)> wrote:
>>> Hi All,
>>>
>>> But much to my dismay, when I tried using the HDRI lighting
>> scheme, I
>>> noticed some serious problems.....
>>>
>>> Thanks.
>>>
>>> Claudia
>>> "Selocic"
>>> (a newbie)
>
>
>
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>
David Bell
nordwind53@(protected)
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