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View Full Version : floating point TIF format - HDRI with light tracer MAX5.1

joske
04-22-2003, 01:06 PM
I've been testing the possibility to use hdri lightning in max5.1
according to cgarchitect.com it should be possible like this:

"High Dynamic Range Imagery (better known as HDRI) is supported in floating point TIF format. So if you have collected a bunch of images in HDR format, you will have to find a way to convert them to floating point TIF format. HDRI is the most common method to do what is known as Image-Based Lighting, where the environment map, for example, embeds color and light intensity and can be used as a light source for your scene. You can use these rich pixel files in the new Sky Light that 3ds max 5 offers. For more information on HDRI, go to http://www.debevec.org. "

i found some hdri images on http://www.debevec.org and converted them using the "HDR shop" software into floating point TIF format
then in the skylight parameter rollout from max i just added the new floating point TIF image in the map button...

with a black screen as a result... :hmm: :rolleyes:

Does anyone know a solution for this?
tnx in advance
mouj
04-22-2003, 01:23 PM
Howdy !

i might be wrong but using Splutterfish's free hdri loader you should be able to use standard hdr images for your lighting. There is an excellent tutorial that shows how to properly use these images (it's aimed at using Brazil, but applies).
I'd have to test it to be sure of that, though.

Else if it fails, maybe lightgen can do it for you, it's a plugin for HdrShop that will let you export an hdr's lighting data to a txt file that you can then import in Max via the lightgen script and it will create a set of lights with corresponding multiplier values and colors.

hope this could help !

mouj
SimonReeves
04-22-2003, 03:21 PM
you can use hdr's just as you would in brazil tut, using the material in the environment slot, and max's scanline skylight
joske
04-22-2003, 03:51 PM
Thanx Mouj,

this is what i found out : :cool:

http://www.splutterfish.com/gabry_hdri_tut_tmp/

Open the HDR Shop and load the Kitchen probe image you can find here. Now, let's transform into latitude by choosing Image, Panorama, Panoramic Transormations. In the Format Source Image take care of selecting the right format, Light Probe in this case. Then choose Latitude for Destination image format. You can also modify the final resolution and conversion quality. Hit OK and you'll obtain the wanted image to save to your preferred destination and to use later.

no need to use the splutterfish plug-in :lightbulb
all that was missing was the extra format transformation (Latitude) of the floating tif in hdr shop.

check out the result in the test render i made :bounce:
SimonReeves
04-22-2003, 03:54 PM
thats the cheese :thumbsup:
mouj
04-22-2003, 04:02 PM
you got it : )


mouj
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