fake HDRI test

[BrandonS]

That is so real it looks just like the broken image icon in HTML.



Sorry I couldn't resist

[michaeli]

a retouched one.

http://218.76.39.7/bbs/attachments/200209/14163049-s6.jpg

[derwolpertinger]

well, as brandon said, there is nothing more to see than the broken icon html image.:( your server may be down or so.

[michaeli]

can u see it now?:rolleyes:

[derwolpertinger]

it's a wonder! i can see!!! :D

i think the wooden planks are reeeaaaally huge. also put a fresnel shader in the reflection channel. besides that i like the pics, especially the second with the thing that has flowers on it(dunno the name).

[prayas]

really nice pieces here! Seen them over@ renderosity this morning! as derwolpertinger said the one with the flowers on it is the best!

Can you tell us about some of the settings on this!

p..:

[michaeli]

Thank for your comment and advice.
The radiocity setting is as follows, no light, only a image on lum channel material applied to the sky object in the scene.

[derwolpertinger]

wow, good results with such low settings, i assume they render pretty fast, do they?

[ThirdEye]

Am I wrong or someone liked my teapot scene very much? :applause:
Very good work michaeli :thumbsup:

[AdamT]

Very nice. One thing that bothers me, though, is that the plastic (glass?) cup isn't casting enough of a shadow, and the shadows generally look a little soft for an outdoor-type scene. You might consider trying a shadow-only light to ground things a bit more.

[LucentDreams]

verty nice but suffers the same common prolem most HDRI fake do, lack of hard shadow. HDRI images reate realy nice area shadows that star hard and spread out to be soft the furthe from the object. is from the surface recieving the shadow.

[kiwi]

Very nice :thumbsup:


The floor boards do look a little bit to fat :)



Stu.

[say-g]

nice... but what is HDRI, like i read that site on it explaining it etc, (some green site) but i dont understand wat it does, why it is used, things liek this.. could someone explain ?

[AdamT]

It stands for "high dynamic range image". Basically it's an image format that contains much more luminance information than a standard image. It's useful for 3D because you can use the HDRI image to generate global illumination, and it's more effective than using a normal image.

For example, say you had an image with a lamp in it. If you used a normal image, the lamp part of the image could only generate (making up numbers) 100% brightness, because it would be pure white and that's as bright as the image format recognizes. But with an HDRI image, the lamp part of the image could generate 400% brightness, because the image contains more luminance information.

[Per-Anders]

HDRI = High Dynamic Range Images, these are images with more information than ordinary images... another way to think of this is that you're creating an image with a higher bit depth than a normal image. Or you could think of it as unlimited bit depth... each value for any given pixel is not given as zer to two hundered and fifty five, instead it's given as either a percentage zero to 100% (or higher than 100%) or more precisely as a floating point number (i.e. one with decimal points after it).

Why HDRI? Well the obvious one is that you get smoother tones on an image, and that you can perform image editing effects without fear of any loss of information... you want to lower the contrast... fine the image will still contain just as much information so you can bring back the contrast at any time. Motion blur? bright light sources blur correctly leaving white streaks rather than just being blurred into the background (compare the difference between photoshop motion blur and an image that's been taken with a camera moving).

Why HDRI in 3d? In radiosity terms any object that is luminant becomes a lightsource... any colour over 100% in brightness is will of course provide more luminosty... this is good for creating real world lighting (i.e. you get a nice HDRI 360 degree panorama of a scene and map that onto a skydome and render with radiosity you get good shadows, and the lighting matches the background perfectly, good for compositing). If you want examples go to newteks website and have a look at the features highlights for lightwave.

[michaeli]

Thanks all guys for your helpful comments. :beer:

derwolpertinger: render time for 1st pic: 1hour, 2nd pic: 38 mins
my pc: amd k7 700Mhz, 128M Sdram

ThirdEye_01: yah. I like your teapot scene very much and your other works. :)

AdamT: it's a glass. I use the way mdme_sadie says in another post, two separate materail for that object, one for front, one for back, is it because it was transparent so it doesn't cast shadow like the teapot?

Kaiskai:thanks for your advice, how can i add hard shadows, use another light plus a negative light?

[LucentDreams]

you could try faking it that way, but it would be hard to control until we get an HDRI render capability it will have to suffice. Right now I feel like saying that Advanced renderer 2 or how ever it will be numbered wil be aweomse, as there isn't much newer in R8, and while cool and helpful as the new features are, they are posible n regular post (well the DOF stuff may be harder, but the highlight and glow are possible to an extent I feel)

[AdamT]

Kai,
Are you talking about the release of Advanced Render after the initial release of R8XL? If so, I'm not asking what's in it (I know you can't say), but there are already new features on the board for AR2?

[say-g]

thank you mdme, i think i understand now.

where would i get HDRI images?

[LucentDreams]

Originally posted by AdamT
Kai,
Are you talking about the release of Advanced Render after the initial release of R8XL? If so, I'm not asking what's in it (I know you can't say), but there are already new features on the board for AR2?

No and noone is thinking that far yet really, I mean I feel that with the new ability to import HDRI images is a step in the right direction, I think this must lead to something else right? No nothing is planned mentioned or considered for any module updates right now, just saying that some day we will have SSS and HDRI and the like, once something else becomes the new hot topic, always one step behind right :(

NO its R8 first, then probably onto Bodypaint or dynamics as PC was updated not too long ago and the other stuff is all new. No clue though R8 is the only focus so thaty you guys don't wait till 2003.

One step at a time my friend, besides you think they'd let me talk abot an upgrade to a module when you saw how titght things are for R8?

[Per-Anders]

if you can use hdri image import then at least you could probably fake it reasonably well using an actual sphere as your envirnment and the image in the luminance channel... at least... in theory. the advanced render engine is pretty nice though and should do for most needs. but it would be great if there was a little more compatability with external render engines... but maybe that's something for third parties to do with export filters.

[say-g]

but is there a website with HDRI images ? or how do u make them...

[LucentDreams]

Originally posted by mdme_sadie
if you can use hdri image import then at least you could probably fake it reasonably well using an actual sphere as your envirnment and the image in the luminance channel... at least... in theory. the advanced render engine is pretty nice though and should do for most needs. but it would be great if there was a little more compatability with external render engines... but maybe that's something for third parties to do with export filters.

This is true, the one I would realy like to see is some sort of RIB support or exprt ability. I want to use exluna and I know many studios could see the advantage of Renderman or exluna in their studios with XL, but that is not gonna hapen anytime soon. Well keep an eye on Splutterfish, they say one of their next goals is a standalone renderer with support for manmy of the larger apps.

[michaeli]

say-g: this site is a great source for HDRI research and pics.
http://www.debevec.org/Research/HDR/

[say-g]

thanks michaeli

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