I tried HDRI and I love it! I am wondering how it really works. This
probably sounds dumb, but I'm assuming radiosity is required for HDRI, can
someone confirm this??

I did use radiosity, no lights, for this image. The box was modelled in
Blender. I put a bump_map on the box top surface.

I found a bunch of free HDRI maps at these links:
http://www.deviantart.com/deviation/10152791/
http://www.deviantart.com/deviation/10036562/
http://www.deviantart.com/deviation/9597501/

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Attachments:
Download 'cresent_pov_scene2.jpg' (156 KB)

Preview of image 'cresent_pov_scene2.jpg'

A very nice piece of work. The blue jewels are especially attractive. I just 
read ( in news@nature) about the liquid phase of oxygen, formed under high 
pressure: a pale blue, magnetic substance. This reminds me of that.
I have been playing a bit with HDRI, but not enough to know much about it.

Thomas

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"Janet" <par### [at] attnet> wrote:
> I tried HDRI and I love it! I am wondering how it really works. This
> probably sounds dumb, but I'm assuming radiosity is required for HDRI, can
> someone confirm this??
>
> I did use radiosity, no lights, for this image. The box was modelled in
> Blender. I put a bump_map on the box top surface.
>
> I found a bunch of free HDRI maps at these links:
> http://www.deviantart.com/deviation/10152791/
> http://www.deviantart.com/deviation/10036562/
> http://www.deviantart.com/deviation/9597501/

Nice.

Have a look at this site, it has some good explainations of HDRI.
http://www.highpoly3d.com/writer/tutorials/hdri/hdri.htm
HDRI is useful for radiosity, but is not limited to it.  It is also useful
for plain environment mapping where it's reflections and other effects (eg,
motion blur) are much more effective than standard low dynamic range images.

Some more freebies (these are actually ones that I made):
http://www.deviantart.com/deviation/27943328/
http://www.deviantart.com/deviation/28753146/
http://www.deviantart.com/deviation/36091025


-tgq

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"Janet" <par### [at] attnet> wrote:
> I tried HDRI and I love it! I am wondering how it really works. This
> probably sounds dumb, but I'm assuming radiosity is required for HDRI, can
> someone confirm this??
>
> I did use radiosity, no lights, for this image. The box was modelled in
> Blender. I put a bump_map on the box top surface.
>
> I found a bunch of free HDRI maps at these links:
> http://www.deviantart.com/deviation/10152791/
> http://www.deviantart.com/deviation/10036562/
> http://www.deviantart.com/deviation/9597501/

Nice image, I find a combination of HDR and a light source still help for
getting good specular highlights.

Thanks for the links, that's a nice selection of HDR image samples.

Sean

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"Janet" <par### [at] attnet> wrote in message 
news:web.450f7678bbaad40792c96d80@news.povray.org...
>I tried HDRI and I love it! I am wondering how it really works. This
> probably sounds dumb, but I'm assuming radiosity is required for HDRI, can
> someone confirm this??

   As far as I know, HDRI works with, and without.  :)


>
> I did use radiosity, no lights, for this image. The box was modelled in
> Blender. I put a bump_map on the box top surface.

    The gems look like a cabochon cut (smooth on the upper surface instead 
of faceted). Maybe a little more ior would make them stand out more? They 
look a little 'ghostly' at the moment?

    Nice work. You'd make a good jewellery designer.

     ~Steve~

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"Thomas de Groot" <t.d### [at] internlnet> wrote:
> A very nice piece of work. The blue jewels are especially attractive. I just
> read ( in news@nature) about the liquid phase of oxygen, formed under high
> pressure: a pale blue, magnetic substance. This reminds me of that.
> I have been playing a bit with HDRI, but not enough to know much about it.
>
> Thomas
Thanks, HDRI is interesting. You can get really different results with
different hdr files. Hmmm, what's the ior of liquid oxygen? :)

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"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> Nice.
>
> Have a look at this site, it has some good explainations of HDRI.
> http://www.highpoly3d.com/writer/tutorials/hdri/hdri.htm
> HDRI is useful for radiosity, but is not limited to it.  It is also useful
> for plain environment mapping where it's reflections and other effects (eg,
> motion blur) are much more effective than standard low dynamic range images.
>
> Some more freebies (these are actually ones that I made):
> http://www.deviantart.com/deviation/27943328/
> http://www.deviantart.com/deviation/28753146/
> http://www.deviantart.com/deviation/36091025
>
>
> -tgq
Thanks Trevor. It seeems like either radiosity or a light source help a LOT
with HDRI, at least with POV-Ray. I like your HDRI maps, and they're made a
lot better too. The living room - nice - lots of toys. :)

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"s.day" <s.d### [at] uelacuk> wrote:
> Nice image, I find a combination of HDR and a light source still help for
> getting good specular highlights.
>
> Thanks for the links, that's a nice selection of HDR image samples.
>
> Sean
Thanks Sean. I like your idea. I guess the best thing to do is whatever
looks the best.

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"St." <dot### [at] dotcom> wrote:
>    As far as I know, HDRI works with, and without.  :)

Well, if you don't have any other light sources, and use non-reflective
objects in your scene, it seems like you have to use radiosity.

>     The gems look like a cabochon cut (smooth on the upper surface instead
> of faceted). Maybe a little more ior would make them stand out more? They
> look a little 'ghostly' at the moment?

I should try with ior, I was thinking that, but I got lazy. Plus, the
polygon count on this model is HUGE. It takes forever just to try stuff
out.
Anyway, I'm glad I posted this image, I am getting some good ideas from all
you nice guys.
Sean, aka s day, says "I find a combination of HDR and a light source still
help for getting good specular highlights."
So, yes, I should try these ideas.
Thanks!

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Janet,
beautiful...
liquid oxygen IOR=1.221
see http://www.webelements.com/webelements/elements/text/O/phys.html
for phyical properties.
DLM

> different hdr files. Hmmm, what's the ior of liquid oxygen? :)

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