IBL - Environment map - Equirectangular - light blue tint with red accent - 3 lights

mCasualmCasual Posts: 4,144
edited April 2013 in Freebies

download : the image shown below (1024x1024)

note : no light coming from below the horizon line

we get some soft shadows at the vase of the objects/figures

--

2nd image shows a Daz Studio 3 scene exported to Blender using mcjTeleblender and rendered through Blender-Cycles

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Post edited by mCasual on

Comments

  • DorseylandDorseyland Posts: 724
    edited December 1969

    >> ROOKIE ALERT! <<</p>

    This is probably very useful.

    But I have no idea what it is.

  • mCasualmCasual Posts: 4,144
    edited April 2013

    >> ROOKIE ALERT! <<</p>

    This is probably very useful.

    But I have no idea what it is.

    Image Based Lighting, is a bit as if you painted the
    attached image ( the one with 3 bright spots ) on a giant sphere
    and used this to illuminate the 3d scene

    when rendering in Blender-Cycles you can use such an image as a "world environment"

    Daz Studio 4.5, has bundled with it a "Uber Environment 2" light

    and you can apply an image like that to it ( The image map of the Color parameter of the Light node )

    though usually people use HDR images for that purpose

    to render this image i did this

    - added a uberenviroment2 light to the scene
    - selected the uberenviroment2 node,
    - applied"Set Quality 4 Hi" to increase the quality
    - applied "Set HDR Dawn" to enable Image Based Lighting
    - in the parameters tab of the uberenviroment2 light, i changed the image map ( Color ) to the one i'm posting in this forum
    - in the surfaces tab of the uberenviroment2 sphere material, i changed the images to the one i'm posting in this forum
    - in the parameters tab of the uberenviroment2 sphere i changed the setting "visible in renders" so we can see the "painted" sphere
    - i changed the color of the uberenviroment2 light to gray, because the light was too bright

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    Post edited by mCasual on
  • DorseylandDorseyland Posts: 724
    edited December 1969

    Okay thanks, Casual. So this is for Blender or DS4.5 ... and gives that gradiant effect in the background? (Which looks very effective in your office scene, by the way.)

  • mCasualmCasual Posts: 4,144
    edited April 2013

    Okay thanks, Casual. So this is for Blender or DS4.5 ... and gives that gradiant effect in the background? (Which looks very effective in your office scene, by the way.)

    i added to the post above the instructions about using it with Daz Studio 4.5's built-in "Uber Environment"

    and here you can see a little animation rendered in Daz Studio 4.5 using the IBL

    it's not just a background, you can see it casts light/color on the scene

    agigi.gif
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    Post edited by mCasual on
  • luci45luci45 Posts: 2,252
    edited December 1969

    Casual said:
    Okay thanks, Casual. So this is for Blender or DS4.5 ... and gives that gradiant effect in the background? (Which looks very effective in your office scene, by the way.)

    i added to the post above the instructions about using it with Daz Studio 4.5's built-in "Uber Environment"

    and here you can see a little animation rendered in Daz Studio 4.5 using the IBL

    it's not just a background, you can see it casts light/color on the scene

    Thanks for posting this. I am always trying to make my own and they don't come out as expected. It looks like from this that I need to use more extreme contrasts and intense color.

    Also, this is a jpg. IBL maps are usually 32-bit HDR or TIF, which are supposed to be better. I noticed that they are different but don't seem better, but I don't do professional grade realistic stuff. What is your opinion/observations about using jpgs or higher rez images for IBLs?

  • wancowwancow Posts: 2,708
    edited December 1969

    I just noticed this! Thanks Casual!

  • mCasualmCasual Posts: 4,144
    edited April 2013

    Luci45 said:

    Thanks for posting this. I am always trying to make my own and they don't come out as expected. It looks like from this that I need to use more extreme contrasts and intense color.

    Also, this is a jpg. IBL maps are usually 32-bit HDR or TIF, which are supposed to be better. I noticed that they are different but don't seem better, but I don't do professional grade realistic stuff. What is your opinion/observations about using jpgs or higher rez images for IBLs?

    if i understand this correctly, HDR just have 65536 intensity levels, while jpg etc have only 256

    i know i had to apply a gray tint to the ''color'' channel because it was coming out too bright

    there's some freeIBL/ HDRs at http://www.hdrlabs.com/sibl/archive.html
    and at http://zbyg.deviantart.com/art/HDRi-Pack-3-112847728

    attached, another IBL image i made, that light map produced good renders

    OmJL_EnvM4p9HiContrast.jpg
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    Post edited by mCasual on
  • mCasualmCasual Posts: 4,144
    edited April 2013

    but in the end i think interesting results happen faster if you
    create 3 lights ( notably Area Lights ) move them, change their size, tint and intensity
    and render ( or real-time preview ) until you get something you like

    ---

    in this case in Blender Cycles ( the scene was exported from Daz Studio using my free mcjTeleblender script

    i tried my custom IBL maps but results were boring

    so i created 3 panels with Emissive materials

    and tweaked and tweaked

    [ the pose and scene composition comes from a clothing store
    http://www.mms591.com/www.mms591.com-photo/2011083111/1-110S1112559.jpg ]

    i'm not really aiming at credible realism either
    so it's easier to stay away from the 'uncanny valley'

    the second image shows the 3 area lights and the faint blue world environment

    the large pink panel has an intensity of 1
    the white panel to Amy's right has an intensity of 10 and is quite close
    the one to her left has an intensity of 7
    the world envuronment has an intensity of 0.25

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    Post edited by mCasual on
  • luci45luci45 Posts: 2,252
    edited December 1969

    Casual said:
    but in the end i think interesting results happen faster if you
    create 3 lights ( notably Area Lights ) move them, change their size, tint and intensity
    and render ( or real-time preview ) until you get something you like

    ---

    in this case in Blender Cycles ( the scene was exported from Daz Studio using my free mcjTeleblender script

    i tried my custom IBL maps but results were boring

    so i created 3 panels with Emissive materials

    and tweaked and tweaked

    [ the pose and scene composition comes from a clothing store
    http://www.mms591.com/www.mms591.com-photo/2011083111/1-110S1112559.jpg ]

    i'm not really aiming at credible realism either
    so it's easier to stay away from the 'uncanny valley'

    the second image shows the 3 area lights and the faint blue world environment

    the large pink panel has an intensity of 1
    the white panel to Amy's right has an intensity of 10 and is quite close
    the one to her left has an intensity of 7
    the world envuronment has an intensity of 0.25

    Thanks for this and the IBl info. Nice soft renders with the area lights!

    I will keep plugging along. I like area lights too but using 3 of them is kind of slow with a big scene, and I have a hard time getting them just right too. I am going to try some of the HDRs from the links you provided and see what happens.

  • Joe CotterJoe Cotter Posts: 3,234
    edited April 2013

    Well there are few differences between IBL and Area lights from my understanding. This is just my understanding so feel free to correct me if I'm wrong.

    IBL offer more dimensional light characteristics vs a more controlled 'Studio' environment that area lights would, so different expectations/results.

    IBL offer much more in the case of reflective surfaces when there aren't a lot of objects in the scene to reflect (the example picture's chrome happens to be such that it does have objects to reflect in this instance.) This can be countered with reflection maps used on the reflective surface but it often doesn't seem to give as good a results on average as IBL, but one's mileage may vary.

    On the other hand, area lights would act more like one would expect studio lights to act.

    The original image being used as an IBL is a bit simplistic and therefore wouldn't show off the true aspects of IBL in it's intended use but is very useful in demonstrating the basic principles of IBL. It removes much of the complexity a normal IBL would have, thus making more apparent what is actually happening in a fundamental sense.

    When I think of IBL, I think of it producing subtle 'noise' in the lighting of the scene, similar to adding noise with a Gaussian blur to the diffuse colors/map does for a texture. The resulting effect takes the overly clean look off of the image to produce a much more realistic environment where things aren't so clean. This means we can use this as a counterbalance between the 'stylized' or toon aspects vs realistic... controlling subtle light, texture, and color noise aspects of our scene.

    However, as I said in the beginning... feel free to correct or clarify any of this :)

    Post edited by Joe Cotter on
  • mCasualmCasual Posts: 4,144
    edited April 2013

    Gedd said:
    ... feel free to correct or clarify any of this :)

    all you said makes sense to me

    in the last few years i often used the "ditch river" map here

    http://www.hdrlabs.com/sibl/archive.html

    the fact that it's located under a bridge makes interesting lights

    the problem with some IBL maps is that light comes from everywhere, and there's not much shadows and highlights left
    another issue is that my materials often hadd much gloss, which are also shadow killers

    the best is possibly to use IBL for the general ambient light, maybe dim it a bit,
    then add smaller area lights to add highlights and sharper shadows

    sometimes i add walls/panels to cut out some of the IBL light

    Post edited by mCasual on
  • Joe CotterJoe Cotter Posts: 3,234
    edited December 1969

    Well I tend to use UberEnvironment as a source of ambient light at about 20-40% with other light sources. The other light sources might be as simple as a distant light for a sun, or multiple lights such as torches, streetlights, etc.. So the IBL is by definition being used as a general ambient light in my case.

    Here's a different take on HDR ;)

  • 3dcheapskate3dcheapskate Posts: 2,068
    edited April 2013

    Casual said:
    ...to render this image i did this

    - added a uberenviroment2 light to the scene (1)
    - selected the uberenviroment2 node, (2)
    - applied"Set Quality 4 Hi" to increase the quality (3)
    - applied "Set HDR Dawn" to enable Image Based Lighting (4 - I used 'Set HDR KHPark.dsa' instead)
    - in the parameters tab of the uberenviroment2 light, i changed the image map ( Color ) to the one i'm posting in this forum (5)
    - in the surfaces tab of the uberenviroment2 sphere material, i changed the images to the one i'm posting in this forum (? Nothing on surfaces?)
    - in the parameters tab of the uberenviroment2 sphere i changed the setting "visible in renders" so we can see the "painted" sphere
    - i changed the color of the uberenviroment2 light to gray, because the light was too bright

    I just started playing with IBL in DS and found this thread. Using DS 4.5.1.6Pro (64 bit) I don't seem to be getting anything on the Surfaces tab. Screenshot attached showing my surfaces tab after completing the first 5 steps as noted above.
    Parameters and Lights tab are fine.

    Probably missing something obvious - any pointers?

    NoSurf.jpg
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    Post edited by 3dcheapskate on
  • mCasualmCasual Posts: 4,144
    edited December 1969

    I just started playing with IBL in DS and found this thread. Using DS 4.5.1.6Pro (64 bit) I don't seem to be getting anything on the Surfaces tab. Screenshot attached showing my surfaces tab after completing the first 5 steps as noted above.
    Parameters and Lights tab are fine.

    Probably missing something obvious - any pointers?

    it's something that happens very rarely, but
    the image has to be applied to a channel named Color .... in the Parameters tab of the uber...light node
    and it can also be applied to the Environment sphere in the Surfaces tab

  • Joe CotterJoe Cotter Posts: 3,234
    edited April 2013

    This can be confusing. Uberenvironment has the parent object and the sphere. The settings you are looking for are on the sphere. Note, as casual said.. it can also be found on the Parameters tab, but this made more sense to me for remembering it.

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    Post edited by Joe Cotter on
  • 3dcheapskate3dcheapskate Posts: 2,068
    edited April 2013

    Thanks Casual/Gedd - so yes I was missing something obvious! Casual's instructions were quite clear (bold red indicates the bit I overlooked)...

    Casual said:
    ...
    - in the parameters tab of the uberenviroment2 light, i changed the image map ( Color ) to the one i'm posting in this forum
    - in the surfaces tab of the uberenviroment2 sphere material, i changed the images to the one i'm posting in this forum
    ...

    And I didn't even spot that little triangle next to 'UberEnvironment2 1' on the 'Scene' tab in my screenshot indicating that the node can be expanded.
    Post edited by 3dcheapskate on
  • 3dcheapskate3dcheapskate Posts: 2,068
    edited April 2013

    Hmmm... I'm 99.9% certain that you need to apply an angular (light probe) map in your fifth step, not a latitude/longitude map like the one in your first post. I've done a few checks and the attached image should hopefully make sense and prove the point (I think the angular map needs to be flipped left/right as well, which I forgot to do for the test

    Luckily it's really easy to convert between the two formats using HDRShop Version 1 (version 1 is still free - there's a download link on theHDRLabs tools page here - http://www.hdrlabs.com/tools/links.html ). Converted version of Casual's liteup.jpg from the first post below.

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    Post edited by 3dcheapskate on
  • mCasualmCasual Posts: 4,144
    edited April 2013

    Hmmm... I'm 99.9% certain that you need to apply an angular (light probe) map in your fifth step, not a latitude/longitude map like the one in your first post. I've done a few checks and the attached image should hopefully make sense and prove the point (I think the angular map needs to be flipped left/right as well, which I forgot to do for the test

    Luckily it's really easy to convert between the two formats using HDRShop Version 1 (version 1 is still free - there's a download link on theHDRLabs tools page here - http://www.hdrlabs.com/tools/links.html ). Converted version of Casual's liteup.jpg from the first post below.

    thanks,

    i didn't study DS's environment maps in detail, there's the issue of the sphere UV mapping also to consider
    the equirectangulat map seems appropriate for Blender-cycles ...
    for Blender-Internal-Render's skes and "worlds" i dont know !

    and for DS's UberEnvironment light it's very possible that a probe type of map is needed

    though, applying an equirectangular image to a probe type of map kinda works :)

    ... oh lets check the ones supplied with DS4.5 ...

    C:\Users\MYUSERNAME\AppData\Roaming\DAZ 3D\Studio3\DAZ Built-in Content\Runtime\textures\omnifreaker\Environment

    there's a .tif and a .hdr for each setting, one must go on the sphere the other on the light-node, and they both look like they are equirectangular

    unless there's differences in uberenvironment 1 and 2 or between DS3 and 4

    see.jpg
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    Post edited by mCasual on
  • 3dcheapskate3dcheapskate Posts: 2,068
    edited April 2013

    Yep, agreed - all the images supplied with the omnifreaker UberEnvironment2 stuff (in both DS3A and DS4) seem to be the equirectangular format - that's why the result of my test surprised me! :)

    This IBL stuff is fantastic though, regardless!

    {Edit: I think Casual's post here was related to this thread}

    Post edited by 3dcheapskate on
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