HDRI without Advanced renderer

[lllab]

this is not possible. hdri needs the radiosity engine with advanced render. sorry there is no other possiblity.

lllab

[ThirdEye]

Originally posted by lllab
this is not possible. hdri needs the radiosity engine with advanced render. sorry there is no other possiblity.

lllab


No you're wrong. You can always use the hdri map to generate some floating point reflections, just put it on a sky object (or anywhere else). HDRI is not = GI

[mnu]

As far as I remember ther is also a HDRI Import Plug that uses Lights to fake HDR Dome lighing. Do a search on postforum. I think it was mentioned ther some time ago.

cheers mnu

[ThirdEye]

Originally posted by mnu
As far as I remember ther is also a HDRI Import Plug that uses Lights to fake HDR Dome lighing. Do a search on postforum. I think it was mentioned ther some time ago.

cheers mnu


DiTools

[nhytro]

Can you elaborate on this Third_Eye? I´m sceptical as to the suggestion that just attaching the HDRI image to a sky object would get the job done.

Thanks

Originally posted by ThirdEye_01
No you're wrong. You can always use the hdri map to generate some floating point reflections, just put it on a sky object (or anywhere else). HDRI is not = GI

[nhytro]

Thanks MNU, I´ll jet to the Postforum to see if I can find something.

Originally posted by mnu
As far as I remember ther is also a HDRI Import Plug that uses Lights to fake HDR Dome lighing. Do a search on postforum. I think it was mentioned ther some time ago.

cheers mnu

[ThirdEye]

Originally posted by nhytro
Can you elaborate on this Third_Eye? I´m sceptical as to the suggestion that just attaching the HDRI image to a sky object would get the job done.

Thanks

It depends on what you want to do. You can't use the HDRI map to illuminate your scene, you'd need the Advanced Render module to do that. But if you want to exploit the reflections of the hdr map you can do that using your hdr as you would with a jpeg. The result of the HDRI has much deeper reflections because of the wider light range of the map itself.

[flingster]

not sure about this.
but for version 7 there was some good hdri stuff.

minus advanced render stuff...dunno really.
ligh dome scenario...as third points out use light dome technique...but this also is more about faking global illumination than hdri stuff....

http://www.cartesiuscreations.com/odds/hdri/hdri.html
http://www.cartesiuscreations.com/odds/tutorials/sadie.html

saw this the other day about global lighting which might help you a little get the effect youre probably looking for.
http://www.metafex.net/cinefex/tutorials/gldt/index.html
will need ditool plugin from remotion.de.vu

really depends as third points out on what you are wanting to fake without the advanced render module.

[nhytro]

Thanks Flingster, I have actually read the tutorials in the links you posted, this sentence in the DICLONER tutorial scared me off:


NOTE: If your using XL7, to get similar results you have to enable "NO LIGHT RADIATION" in the lights general settings, as XL7 doesnt have light exclusion


I´ll try it out to see if it works.

[lllab]

well, yes you can do fakes, thats true,

but real hdri calculation, which also includes light from the hdri image only can be done with radiosity / GI.

so real hdri stuud is NOT possible, i am quite sure. of course you can use pictures with ditools or use them for reflection maps. but thats not really using the quality of hdri.

cheers

stefan
lllab

[ThirdEye]

Originally posted by lllab
of course you can use pictures with ditools or use them for reflection maps. but thats not really using the quality of hdri.


Tell that to Digital Domain :D

[miketche]

I did this test image using the "50grEy" plugin for the lighting and a converted HDRI image for the reflections. No Radiosity was used. I'm sure the DiTools plugin would work even better, but I have not used it much.

[flingster]

not really related to thread but what with discussions over GI...worth a read...
Hyper-GI™ illuminates your animations!
http://www.finalrender.com/products/feature.asp?UD=10-7888-35-788&PID=36&FID=375

[Kotayus]

Originally posted by nhytro
Thanks Flingster, I have actually read the tutorials in the links you posted, this sentence in the DICLONER tutorial scared me off:


NOTE: If your using XL7, to get similar results you have to enable "NO LIGHT RADIATION" in the lights general settings, as XL7 doesnt have light exclusion


I´ll try it out to see if it works.

nhytro: dont be scared by this...the reason is...without light exclusion you can see the lights all over the object...in the lights general settings there is a box that can be checked that says "No Light Radiation" this would cause all of the light points to not be visable, thats all.

Here is what it would look like with out checking NO LIGHT RADIATION:
http://www.metafex.net/imagehost/example.jpg


And here is a "HDRI Fake" with ditools...it would have been nicer if that image was bigger...to pixely....but youll get the idea.
http://www.metafex.net/imagehost/fake.jpg

[LucentDreams]

Originally posted by nhytro
Can you elaborate on this Third_Eye? I´m sceptical as to the suggestion that just attaching the HDRI image to a sky object would get the job done.

Thanks

You guys are misunderstanding what HDRI is and does. Using it on a sky (or even as an environment in the material) will take full advatntage of the non clamped values of the HDR Image, so you get those nice intense reflections.


Originally posted by lllab
well, yes you can do fakes, thats true,

but real hdri calculation, which also includes light from the hdri image only can be done with radiosity / GI.

so real hdri stuud is NOT possible, i am quite sure. of course you can use pictures with ditools or use them for reflection maps. but thats not really using the quality of hdri.

cheers

stefan
lllab

Sure its is, the new ditools use the unclamped valus as I understand it, so the brightness of a light will go past 100% if the value in the HDRI is above 100%, miv that with the reflection map, and all your missing is the lightbounces. But do remember HDRI and Texture illumination are two different things, and HDRI is not only for Texture illumination it has other uses. HDR is simply an image format though, it should not be refered to as a technique, heck open EXR can be used for the same thing(not in C4D though as EXR isn't supported yet :/ )

[nhytro]

Thank you all very much for the replies and tips. This thread was very informative
:thumbsup:

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