tutorial : Simulating HDRI with LDR

[sledgeweb]

Thanks for the quick tut. I'll try this when I get home. One thing that occurs to me, for people who are more comfortable tweaking their graphics is a graphics application, like photoshop, you could just create your different maps with that and then bring them into MAX.

-Sledge

[sledgeweb]

Where is the "lightprobe" you mention, and what does it do? Coudn't find anything about lightprobe on your linked site...

-Sledge

[Kel Solaar]

Hello Sledgeweb.

I do this trick in max because in photoshop you won't be able to have a white value upper than 255. 255 .255. In a HDR image the white value can be enormous, far from the 255 limit of a LDR map, that's why it's called High Dynamic Range image. So how to have value over 255 in a classic LDR image? by multiplying his outpout in your renderer. I use a Scale map to control where I want to multiply this outpout (sourcelights, sun, or everything that cast light). I hope you understand what I have said (my english isn't good enough to be very clear)

I have updated the tutorial with a more direct ling to the lightprobe (a lightprobe is just a full 360°*360° environment HDR map)

LightProbe (http://hdri.3dweave.com/library/freak.php)

If you have questions don't hesitate :)

[sledgeweb]

Thanks. What I meant was, use photoshop levels to create a black and white image with the blurred light spots. Then you can load this as a scale map and continue from there. I simply meant you could use photoshop to take your original image, and create a "scale map" for use in max. Wouldn't that work? You would still use the gain in max to bump it higer, but you could create the map in photoshop...

-S

[Kel Solaar]

Yes of course :) that is what i do. I create my scale map with photoshop. Maybe there is something I have bad explain in the tutorial, or something not very clear?

[glorious100]

Thx for the nice tutorial Kel Solaar.

[FatAssasin]

Excellent information! I'll have to study this in more detail later.

Shouldn't this thread be in the Totoruials and Tips section?

[sledgeweb]

KEL-

Sorry, didn't realize you were using photoshop for that. Don't think you mention it in the tut, but you do show a screen cap of photoshops level editor. Guess the language threw me off!

-Sledge

[Kel Solaar]

FatAssassin: yes i think it would be better if it is in the Tutorial section (It's the first time i post a link to a tutorial here, and I didn't see that there is a Tutorial section :shrug: )

Sledgeweb : no problem :)

[pencil-head]

you da man Kel Solaar :thumbsup:
thanks for the tut

[Reezeex]

THX!!
:beer:

[sledgeweb]

Kel-

I can't get the lightprobe images open. I download the zip file, open up, there is a file inside of extension .HDR - I try opening this in photoshop to edit, but get an error saying "wrong file type". Am I missing a step or something?

Thanks,
Sledge

[Reality3D]

http://www.debevec.org/HDRShop/

[sledgeweb]

Thanks. Man... didn't realize HDRI was its own little world! Thought it was just a rendering method...

[Kel Solaar]

Yes :) the main inconvenient with HDRI is that there isn't actually a good program to edit HDR pictures. Of course there is photogenics HDR but it's not very userfriendly and the workflow isn't terrible O_o

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