Binary - Trinary sun HDRIs?
DaWaterRat
Posts: 2,885
Anyone have any leads on these? I did an admittedly quick search in the store and didn't see any.
My one attempt at creating an HDRI in Bryce was something of a fail (I got a workable image in, but I don't think I exported it correctly) and I'm not sure if I even could make multiple suns in Bryce or not.
Obviously, just making multiple sunlight sources in IRay (or even 3DL) is relatively simple, but I'm wondering if there's an HDRI out there (or someone can reccomend a text tutorial on making one that can be done in GIMP) where I could possibly have both (or all three) suns in the image at the same time.
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Comments
DaWaterRat - I can only help with Bryce. With Bryce 7.1 come 4 tutorials how an HDRI can be made. You can also export an HDRI made from a Bryce sky, then move the sun to another location and create again an HDRI in the Sky Lab and export as HDRI, then you can merge them in an HDRI capable program (e.g. HDRShop, PhotoShop CS3 or newer).
Doing an HDRI from a Bryce render needs to understand (a) how to make a spherical panorama and (b) how to make (or cheat) it into an HDRI. It is a tricky subject but it can be done by simulating several exposures, save the renders as 48 bit TIFF and merge them to an HDRI. That's essentially what the tutorials are about.
The main issue when exporting an HDRI made from the sky is that the sun is not bright enough to serve as key light. If you export one, two or several HDRI made from the sky with the sun in different locations, you can place distant lights at the location where the sun in the HDRI appears and thus get the keylight as if it were from the sun.
You can also make an HDRI from the sky and mix it with the same sky but the sun in a different location, then you have 2 visible suns but only one that is bright enough for the key light, the second one has to be boosted with a distant light.