Digital Art Zone

 
   
2 of 3
2
First HDR Attempt.
Posted: 18 February 2013 12:18 PM   [ Ignore ]   [ # 16 ]
Addict
Avatar
RankRankRankRank
Total Posts:  2559
Joined  2004-07-06

1 = this is the global shadow control - it is not well labelled.  Turn this off and no direct light shadow are cast.  This wants to be set to 100 for most renders.

2 = disable the sunlight should only turn the sunlight off - not affect the shadows cast by other light sources (that’s 1’s job).

3 = or set these values to 0 and you will have effectively disabled the sun.

Image Attachments
Image14.jpg
 Signature 

that Bryce Tutorials Info and this Products made by Horo and myself and a link to my gallery at DAZ 3D

Profile
 
 
Posted: 18 February 2013 12:44 PM   [ Ignore ]   [ # 17 ]
Addict
Avatar
RankRankRankRank
Total Posts:  3470
Joined  2004-10-01
Analog-X64 - 18 February 2013 11:38 AM

@Horo If I turn off the sun, I lose the shadows and enabling “Cast Shadows” in IBL does not help either.  I still have a lot to learn smile.

Example shows IBL settings, using the same HDRI as you did (though I tone-mapped it for the backdrop, but that doesn’t change light and shadows).

Below the result, just lighting the cylinder on the ground plane with this light probe. Renders in 2-1/2 minutes.

 

Image Attachments
IB1.jpgIB2.jpg
 Signature 

**  [ Stuff by David Brinnen and myself**  [ My DAZ 3D Gallery**  [ My Website**  OPC 4565 **

Profile
 
 
Posted: 18 February 2013 03:52 PM   [ Ignore ]   [ # 18 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24

Latest render with Horo suggestions.

Image Attachments
IBL_Settings2.jpgAbstract9hdrv6.jpg
 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 20 February 2013 05:11 AM   [ Ignore ]   [ # 19 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24

Here is another attempt, seems there is a fine balance between getting the scene balanced with the sun turned off and HDR only.

I’ve been playing with “Intensity” & “HDRI Effect”  one setting brightens up the sphere and the other brightens the ground.  I cant seem to find a middle ground where the sphere is properly lit and the ground is not blown out.

I like the over all look, but I think the sphere should be a bit brighter.

Image Attachments
Abstract9hdrv7.jpg
 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 20 February 2013 05:37 AM   [ Ignore ]   [ # 20 ]
Member
Avatar
Rank
Total Posts:  172
Joined  2009-05-04

Maybe you could add a tiny bit of ambience to the sphere material. BTW looks great.

Profile
 
 
Posted: 20 February 2013 05:51 AM   [ Ignore ]   [ # 21 ]
Addict
Avatar
RankRankRankRank
Total Posts:  3470
Joined  2004-10-01

@Analog-X64 - I like what you did, but you’re the final judge. HDRIs with a bright light source can be a bit of a problem to get the shadows or the parts not directly lit by the bright light source bright enough. One possibility is to turn the HDRI shadow intensity down. It works differently than the Sun shadow intensity, which adds transparency for light to the object and should stay at 100 in most cases.

Another possibility is to use an HDRI without a very prominent light source, like the sun, and use the Bryce sun to give the main light. In this case, the HDRI will give nice ambient light, which is mostly omnidirectional and thus also lights the shadowy parts. If the ground plane is set to not cast shadows, it gets transparent for light from below and if there’s too much of it, you can put another plane beneath it and set it to partly transparent to control the light.

Yet another method if you’re using an HDRI with a prominent light source, you can cover it with a sphere, which is set partly transparent to control the main light hitting the scene through the sphere and giving that sphere a lot of ambiance. So it looks like the sun it covers but does not cast light, the light comes from the HDRI sun and is attenuated by the sphere. This is a method to balance strong direct light and weak ambient light.

 Signature 

**  [ Stuff by David Brinnen and myself**  [ My DAZ 3D Gallery**  [ My Website**  OPC 4565 **

Profile
 
 
Posted: 20 February 2013 06:28 AM   [ Ignore ]   [ # 22 ]
Power Member
Avatar
RankRankRank
Total Posts:  1583
Joined  2007-12-10

Another thing I usually do when I mix HDR with Bryce sun is to set the specular setting on the sun to 0, that’ll stop it from affecting the ground and bleaching out the texture or showing an awkward blurry light spot on the sphere.

Alternatively, with a bit more messing around with the balance of light sources you could try excluding the ground from the HDR. Then you can turn the intensity up to brighten the sphere without it having any effect on the ground plane.

 Signature 

I’ve got nothing of my own to promote, no models, no tutorials, no website, nothin’, nada, nill, nowt.

Profile
 
 
Posted: 20 February 2013 05:01 PM   [ Ignore ]   [ # 23 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24

I think for this particular image I’m going to stop here.

I can just keep going and going and going. smile

I like the synthetic look of the original one I made and thank to all the advice here, I also like the HDRI version which adds that realism.

Looking forward to doing more of these renders.

I’m already thinking of my next Boolean spherical shape, which I plan to make more complex.

 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 20 February 2013 05:49 PM   [ Ignore ]   [ # 24 ]
Power Member
Avatar
RankRankRank
Total Posts:  1583
Joined  2007-12-10
Analog-X64 - 20 February 2013 05:01 PM

I think for this particular image I’m going to stop here.

I can just keep going and going and going. smile

Yes, it’s one of the drawbacks of having infinite options, sometimes each tweak just makes it different and not necessarily better (or worse).

 

 Signature 

I’ve got nothing of my own to promote, no models, no tutorials, no website, nothin’, nada, nill, nowt.

Profile
 
 
Posted: 20 February 2013 06:25 PM   [ Ignore ]   [ # 25 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24
TheSavage64 - 20 February 2013 05:49 PM

Yes, it’s one of the drawbacks of having infinite options, sometimes each tweak just makes it different and not necessarily better (or worse).

Yes!!!! out of the 7 versions I’ve posted I like 3 of them.

 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 21 February 2013 01:52 AM   [ Ignore ]   [ # 26 ]
Power Member
Avatar
RankRankRank
Total Posts:  1446
Joined  2011-09-25

You liking the results is the important thing, Analog.  Only you know if you’ve accomplished your vision.  I’ve enjoy watching the progression of your work.  I actually like all you’ve posted, each one having something I find interesting.

 Signature 

If you constantly look backward, it’s guaranteed you’ll run into something on your forward journey.
My Gallery Page: GussNemo’s Efforts

Profile
 
 
Posted: 23 February 2013 10:23 AM   [ Ignore ]   [ # 27 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24

I didn’t create a new topic, since its still related to this particular scene.

So I wanted to do a final render at 1920x1080 and it took slightly over 6 hours.

Is there something I could have done to optimize the render time? or that’s just how long a raytrace of this type is going to take.

I’m including a screenshot of the render settings. and the priority was set to high so all 4 cores were running at 100% during rendering.

I could setup network rendering with an additional 4 PC’s running Core 2 Duos each.  But I’m not sure if the overhead of rendering over a network would help me in this instance. since I’m not actually animating.

Image Attachments
render_options.jpg
 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 23 February 2013 10:30 AM   [ Ignore ]   [ # 28 ]
Addict
Avatar
RankRankRankRank
Total Posts:  2559
Joined  2004-07-06

Well… it all depends in this case as to the quality of light you are trying to achieve with the soft shadows.  By and large, it is not efficient to use premium effects for just soft shadows.  If you are in this position, it is often better to simulate the effect in regular mode using multiple light sources instead.  Whatever you do though.  Don’t use soft shadows in regular mode as this will possibly take even longer!

Optimising render times is something I specialise in, but I’d need you to send me the source to figure it out.  If it is under 10mb you could email it to me.  You might be doing it already by the best method, but without picking your scene apart it would take a long Q and A to get to the bottom of it.

Image Attachments
Soft_shadows.jpg
 Signature 

that Bryce Tutorials Info and this Products made by Horo and myself and a link to my gallery at DAZ 3D

Profile
 
 
Posted: 23 February 2013 11:17 AM   [ Ignore ]   [ # 29 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24
GussNemo - 21 February 2013 01:52 AM

You liking the results is the important thing, Analog.  Only you know if you’ve accomplished your vision.  I’ve enjoy watching the progression of your work.  I actually like all you’ve posted, each one having something I find interesting.

Thanks for the kind comments, more on its way smile

 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
Posted: 23 February 2013 11:18 AM   [ Ignore ]   [ # 30 ]
Member
Rank
Total Posts:  98
Joined  2005-01-24
David Brinnen - 23 February 2013 10:30 AM

Optimising render times is something I specialise in, but I’d need you to send me the source to figure it out.  If it is under 10mb you could email it to me.  You might be doing it already by the best method, but without picking your scene apart it would take a long Q and A to get to the bottom of it.

Thanks for taking a look smile  I’ve pmed you a link where you can download the scene.  It is 12MB and zipping the file didn’t make a difference in size.

 Signature 

My Audio Production: http://soundcloud.com/analog-x64

Profile
 
 
   
2 of 3
2