render stuck- how do I get it moving?

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  • NovicaNovica Posts: 23,887
    edited December 1969

    Hi folks- sorry, had to get some sleep.
    It IS a very closeup of the hair. So kinda figured if hair was the culprit, since the hair is featured and ultra close, I'm doomed for a long render time as I already started the render before all the suggestions were posted. I'm at 26% at 9 hours- but was at 23% only an hour ago. Looks fantastic btw. I will turn the rate down from .010 to less "perfect" if the render times stay this long. Normally I enjoy doing the high quality as I start the render and leave to do other things, so it's really not tying me up. But with PH, if I DO anymore (lol) I will definitely adjust that!

    Questions (and clarification for other newbies):
    1. Not sure how this works, but once it gets PAST the hair (it's going horizontally) then it should speed up, right? (Like when it starts getting to just the neck and shoulders?) Or does it continue to be slow just because the hair is in the scene?

    2. In the other thread, I believe it was you, Szark- you mentioned the max ray traced depth should match the number of surfaces for refraction? Do I have that right? To clarify- does that mean like surfaces such as a mirror, water, or am I confusing reflection with refraction? This sounds silly, but how do you know how many surfaces to count?

    3. Trans maps are transparency maps, correct? How do you know when an item has a lot of those? Is it mostly hair, or I believe skin also? Where do you go to see what the files are for an item in the scene- can you do it in studio or do you have to use your directory?

    4. Occlusion does what on hair? I'm headed off to look that term up- again. (Sigh- my memory- and I can't go to Best Buy and purchase/install more of it, lol!)

    At 27%, faces are coming in...and I'll be leaving for a few hours this afternoon, so thanks in advance for helping and answering questions.

  • NovicaNovica Posts: 23,887
    edited December 1969

    From going back and reading- the ray trace depth is for reflection, not refraction?

  • Richard HaseltineRichard Haseltine Posts: 101,010
    edited December 1969

    Ray trace depth is for both reflection and refraction - it doesn't affect ray-traced shadows though.

  • Richard HaseltineRichard Haseltine Posts: 101,010
    edited December 1969

    1. Yes , at least as long as the clothing doesn't have multiple layers of lace created by transparency

    2. Yes., those would be surfaces that used one or more ray-trace bounces

    3. The issue isn't the number of maps, it's the number of overlapping surfaces. Hair can be very bad, but so can plants which use an opacity map to set the shape of leaves or flowers or, as I mentioned above, multiple layers of lace (which usually relies on a transparency map).

    4. Occlusion is used by ubverEnvironment, it's the effect of getting shadowing in recesses and nooks. If you aren't using an environment light, or the soft lighting kit, it isn't in your scene (well, it can be set as a surface property with pwSurface too, but it's unlikely that that is being used by your hair).

  • NovicaNovica Posts: 23,887
    edited December 1969

    thanks Richard *smile*
    I'm now zipping along- it's at 32% at almost 11 hours- but it's gotten to the face, only slightly framed with hair (but there's two folks) so it seems to be speeding up.

    Appreciate everyone's input. Hopefully folks can use these suggestions too if they get stuck. I couldn't find my old post, but it wasn't dealing with hair- and I don't think my rate was .010 either. It was months ago.

  • NovicaNovica Posts: 23,887
    edited June 2013

    36% at 11 hours 10 minutes- it is now getting to the face, so just wanted folks to see how much faster it sped up. It jumped 4% in about an hour 15 minutes (which took three hours or more when at the hair part to move 4%)

    Post edited by Novica on
  • SzarkSzark Posts: 10,634
    edited June 2013

    2: If you want a reflection of a reflection then you need a max ray trace depth of two. If you want a single reflection in one mirror then max ray trace depth of 1 will be good.

    Reflection, refraction and SSS are ray Traced function. If you have a glass with thickness and you are suing refraction then you need the match the max ray trace depth to how many surfaces the refraction will go through, in the case of the empty glass, 4.

    If you don't have any ray traced functions going them drop the max ray trace depth to 0. You will still get Ray Traced shadows at 0.

    3: look at your hair surfaces and the more zones it has the more trans maps there will be. Looks up Trans map with google and that will answer you question on skin...no skin doesn't use trans maps as standard.

    4: Ambient Occlusion = Ambient, meaning indirect light that gets bounced around lighting up corners etc and Occlusion meaning occlude to exclude. Removing AO form hair will make it render faster if UE2 is used. You just won't get any benefit from having AO on hair most of the time anyway.

    Soory for the dely I was in the mid of replying when I had a visitor.

    Post edited by Szark on
  • SiscaSisca Posts: 875
    edited December 1969

    Once it gets past all of the hair it should speed back up to what you're used to seeing. For me though it sometimes seems that the ends of the hair take the longest. I've never actually measured it, just a feeling I get.

    Max Raytrace depth needs to match the number of reflections you want to have for sure. You can have a mirror in a scene but set that to 0 and the mirror won't reflect. This would allow you to show someone looking in a mirror but seeing a different reflection.

    What I'm curious about is how does this setting impact light reflecting off of things other than mirrors. For example, in video and photography one of the reasons for makeup is to reduce the reflectivity of skin. If you're doing a render of a model in a bikini on a beach does this setting determine how the skin effects the bouncing of the light?

  • Richard HaseltineRichard Haseltine Posts: 101,010
    edited December 1969

    Sisca said:
    Once it gets past all of the hair it should speed back up to what you're used to seeing. For me though it sometimes seems that the ends of the hair take the longest. I've never actually measured it, just a feeling I get.

    Probably an illusion - caused by the fact that there's usually still some invisible geometry after teh visible end of the hair, so you are actually waiting for the render to get past that (if you switch to wireframe view you will see this).

    What I'm curious about is how does this setting impact light reflecting off of things other than mirrors. For example, in video and photography one of the reasons for makeup is to reduce the reflectivity of skin. If you're doing a render of a model in a bikini on a beach does this setting determine how the skin effects the bouncing of the light?

    It doesn't, light doesn't bounce in that way in 3Delight (it does in LuxRender etc,, but they don't use the depth setting).

  • SiscaSisca Posts: 875
    edited December 1969

    Thanks for that. I knew that light didn't work in 3Delight like it does in the studio but I wasn't positive how this setting might impact things.

  • NovicaNovica Posts: 23,887
    edited June 2013

    Proudly presenting Chiara (V6) and Cassini (V5) Rockin' The Pure Hair: Space For Genesis!
    (Note: Chiara and Cassini are MY two characters- not in store. I know that can be confusing if you're not following my art studio thread.)

    Over 13 hours (setting was the .010) and won't be doing THAT again with two figures with the same hair!
    This was to show the PH Space could work with the Genesis V6 figure. (My Chiara) It also said it was for the guys so here' the gals wearing it.

    And thanks again for the help.
    The hair reviews start here:
    http://www.daz3d.com/forums/discussion/19756/P510/#360919

    but they will not be with that .010 setting unless they render a lot quicker!

    CassiniAndChiaraSpaceHair.jpg
    1700 x 1500 - 1002K
    Post edited by Novica on
  • patience55patience55 Posts: 7,006
    edited December 1969

    Worth framing :-) Congrats.

  • NovicaNovica Posts: 23,887
    edited December 1969

    Worth framing :-) Congrats.

    LOL- well....not ready for a museum wall, but the one in my foyer perhaps... (I can just see my family saying, "Who the heck are THEY?" To which I would reply, "My 13-hour-keep-checking-on-them pals." I wish I could have tweaked the lights, but at least the hair really shows well. The Pure Hair series is doing nicely for Genesis 2 (I just reviewed another one, only took 3 and a half hours with the shading rate .085, and am doing another one right now.)

    So thanks! *Smile* (since smiley faces seem to be a thing of the past for WEEKS)

  • patience55patience55 Posts: 7,006
    edited December 1969

    Novica said:
    Worth framing :-) Congrats.

    LOL- well....not ready for a museum wall, but the one in my foyer perhaps... (I can just see my family saying, "Who the heck are THEY?" To which I would reply, "My 13-hour-keep-checking-on-them pals." I wish I could have tweaked the lights, but at least the hair really shows well. The Pure Hair series is doing nicely for Genesis 2 (I just reviewed another one, only took 3 and a half hours with the shading rate .085, and am doing another one right now.)

    So thanks! *Smile* (since smiley faces seem to be a thing of the past for WEEKS)

    Yeah, spot renders can only warn of so much. Some have also mastered carefully done post work to make some of those "other" corrections. Word may vary from program to program, the brush/option is called "burn" in some. Can lighten/darken areas for touchup ... but for those reading this who are new to the entire concept; "always" work on a copy ... and using layers is a good idea too.

  • NovicaNovica Posts: 23,887
    edited December 1969

    Yep, I did a post in my art studio about the value of post work. We have PhotoShop with layers, but I haven't had time to tackle that program yet. I do lighten/brighten in Corel Photo Paint and adjust brightness, contrast, intensity- but this one I thought was good enough to showcase the hair. In Corel, I think it was "dodge" but it's been awhile. It was a Q-tip looking thing. And my Corel is funky- sometimes it won't show the brush and no matter what tool setting I go into, I can't make the brush reappear unless I close out and come back in. Love/hate technology!

  • patience55patience55 Posts: 7,006
    edited December 1969

    Novica said:
    Yep, I did a post in my art studio about the value of post work. We have PhotoShop with layers, but I haven't had time to tackle that program yet. I do lighten/brighten in Corel Photo Paint and adjust brightness, contrast, intensity- but this one I thought was good enough to showcase the hair. In Corel, I think it was "dodge" but it's been awhile. It was a Q-tip looking thing. And my Corel is funky- sometimes it won't show the brush and no matter what tool setting I go into, I can't make the brush reappear unless I close out and come back in. Love/hate technology!

    Dodge! Yes that's the other word used. I find PSP tends to loose a window tray when it's minimized; but if one brings the cursor to the far left side as to drag wider or narrower the tray, it'll reappear.

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