HDRI creation

[cstuartpaint]

ok. so i've used them in my renderings and have downloaded them for free at http://www.aversis.be/extras/index.htm

-but i want to know how to make my own. any help?

[cstuartpaint]

Re: HDRI creation

actually, after opening the ones from aversis, i see that he set up a chrome ball and photgraphed the refelections in it. i also found at anothe site how to compile your images in photoshop... see here- http://www.popphoto.com/howto/3038/h...ge-images.html

[dalomar_cg]

Re: HDRI creation

I did a quick search for some tutorials, but came up dry...I know I've seen them, so I'll look again later.

Making them though is a rather involved process. Basically, the "best" hdrs combine about 18-26 (as a ballpark, but the more the better) different exposures of the same image. So that means that you've got to keep the camera very still between all of those shots (having a tripod is requirement...and a sturdy one at that) and in the case of a mirror ball shot, that as well. Typically you'll have to take all those exposures at least 2 spots for a mirror ball shot and numerous orientations for a correct spherical mapping (the better mapping of the two).

After all that, then you'll probably need HDR shop as ps doesn't really do too well for creating hdr environments (general hdr photography is better, but float point editing in PS CS3 is still not up to par).

Not to discourage you, but just laying out some of the facts about it. Its something that is achievable though. Many big studios actually will make their own (or have the client pay for it) HDRs from a specific location/shoot so that everything matches very well. Hope this initial info helps...as I said, I'll see what I can find with a more deeper look.

[cstuartpaint]

Re: HDRI creation

thanks damien-
if you happen to find more places that they are available for download, let me know.

[Micha_cg]

Re: HDRI creation

One side for anything around HDRIs + HDRI handbook:

http://www.hdrlabs.com

.... and some free highres HDRIs, short link.

[nikiM]

Re: HDRI creation

One side for anything around HDRIs + HDRI handbook:

http://www.hdrlabs.com

.... and some free highres HDRIs, short link.

How many pixels must be HDR map for 1600x1200 pix. rendering ?
Can you post some jpg example so we can see blur values ... :

best regz

[Micha_cg]

Re: HDRI creation

It depends on the viewangle of your Rhino cam, best you test it - download the sIBL of the month collections from http://www.hdrlabs.com/, that contain nice HDRIs.

General I would say try get more than 3000..5000x.. pixels. For example DOSCH HDRIs are at 10.000x5.000, very nice quality.

[cstuartpaint]

Re: HDRI creation

great links! thanks

[nikiM]

Re: HDRI creation

It depends on the viewangle of your Rhino cam, best you test it - download the sIBL of the month collections from http://www.hdrlabs.com/, that contain nice HDRIs.

General I would say try get more than 3000..5000x.. pixels. For example DOSCH HDRIs are at 10.000x5.000, very nice quality.

... thanx a lot for your reply ,
is it true that using blured HDR maps decrease render time ?
From the link above I found 1 HDR only , but it`s huge ( Zion_Sunsetpeek.zip ) ... I`m afraid for the render time and crashes. My model is 180mb with default Rhino mesh settings.

best regz

[Micha_cg]

Re: HDRI creation

Here you find more HDRI:

http://www.hdrlabs.com/gallery/panogallery.html

and yes, downscale the HDRI at 512x256, apply a blur and use this HDRI for GI environment helps a lot for the GI sampling calculation.