HDRI questions
|
05-20-2015, 08:58 PM
(This post was last modified: 05-20-2015 08:58 PM by SinCyprine.)
Post: #1
|
|||
|
|||
HDRI questions
hi forumites !
i'm learning how to use HDRI and i'm a little bit confused. what are those different files .exr and .ibl ? how do i properly use them with Octane plug-in ? > i followed this tut http://www.peterguthrie.net/blog/2015/3/...ane-render but not satisfied at all with the result: the scene is poorly lit, the background image from the hdr is blurry/bland. Is it because i've used a poor quality freebie hdri ? any input welcome |
|||
05-21-2015, 09:31 AM
Post: #2
|
|||
|
|||
RE: HDRI questions
well, not an expert where HDRI is concerned, but...
from my experience it basically provides a method for instant global illumination (without having to setup lots of lights and/ or a sun) but usually it's flat (no deep shadows) and the image basically determines the feel of the scene, for example daylight, sunset, night, warm, cold, etc there was a trick needed for adding deep shadows, but I think they fixed it by being able to have both a sun and HDRI you can also use it as a background like skies, city skyline, etc in which case you can have it blurred in some cases or if you want it sharp then it has to be an appropriately high resolution I believe you can have it all sorts of formats like exr and ibl, but also png, etc |
|||
06-02-2015, 03:26 AM
(This post was last modified: 06-02-2015 04:02 AM by whiterabbit0.)
Post: #3
|
|||
|
|||
RE: HDRI questions
PNG's do not have the necessary bit depth to function as an HDRI lighting source.
If you look at this video you can see the full dynamic range of a properly created HDRI Image : ( I queued the time that you need! ) You see how the image doesn't fade like a normal JPG does. That's what makes it work as a scene light correctly. https://youtu.be/4fF-N8xW6UQ?t=3m16s If you lit your scene with an incorrectly constructed HDRI image or a JPG / PNG file it will appear very dark and muddy. I'm not familiar with Octane specifically. However with most GPU based renderers like Keyshot & Marmoset ( I believe Octane is a similar program ) you just load the HDRI image in and it goes. It's pretty much load & run. |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 1 Guest(s)