IBL FG set up

[cpan]

you'd better use a blurred/resized HDR for FG and the full HDR image for reflections/refractions/eye/etc.
To do so, firstly download and install the RayType (http://www.impresszio.hu/szabolcs/MentalRay/RayType.htm) shader. Then fireup maya, create your IBL node (from the Render Settings window) and set the Type to "Texture" instead of "Image". Now, press the map-button next to the texture slot and from the Create Render Node Window/mentalray_tab locate the RayType shader. Now take a big breath :). Open RayType's AttributeEditor, Thick "Enable FG" checkbox and in the undimmed FG slot, plug a file node pointing to the resized/blurred version of your HDR. Now finally plug the fullsized/high quality HDR in the Eye slot of the RayType and hit render :)
PS to resize/blurr the HDR, get the free HDRShop 1.0 from Paul Debevec's site.

btw also check this thread:
http://forums.cgsociety.org/showthread.php?t=285301&p=2748770


cheers

[Domo_Digital]

so as is, I cant get a good FG render?

What do you mean resized/blurred?? what size? how much blur?

[cpan]

nope, you definately can get noiseless FG + HDR pics.

What do you mean resized/blurred?? what size? how much blur?
make it half the initial size (or even lower) to speed up renderings and blurr it (Image>Filter>Gaussian Blurr in hdrshop) until you get a very smooth image (i usually set the Gaussian Blurr Width to 20 in hdrshop)

.p

[PixelMachine]

You shouldn't blur your hdr, it's incorrect. I usually rescale it to 128X64 and then apply a diffuse convolution transform in HDRShop. That is the correct way to approximate the incoming diffuse irradiance.

[DaddyMack]

Thanks for this guys... I have a scene that I'm having the same prob with and this sounds like just the solution:beer:

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