Strange spots appearing on my Luxus-Luxrender renders
Sparkie Shock
Posts: 96
Hey everyone .. I'm trying to use Luxus and Reality 4 with Luxrender but I keep getting these spots appearing on my renders .. they're like some kind of glitch and they seem to appear on every image I do so It's not something specific about Luxus or Reality. Probably some thing I'm not doing right in LuxRender .. or perhaps it's a Mac OS/LuxRender problem .. I haven't tired this on my Windows side yet.
Anyways, if anyone is aware of what might be causing this please chime in and let me know. It's really frustrating that this stuff just don't render without glitches, when there's no reason for it not to.
I've enclosed a (censored) pic of one of my characters that I'm trying to get a decent render of. He looks great .. apart from all this glitch crap! Looks like he got sprayed with white paint.
Look forward to hearing your thoughts .. and fixes if there's any.
Image removed, please repost a cropped version, so that you don't need the Big blackspot as per this post
http://www.daz3d.com/forums/discussion/3279_11/
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Comments
That's not white paint splatters, it's ultra-shiny highlight reflections from your lights. One of the things that Luxus can't yet handle properly is the difference between D|S-3Delight material parameter limits, and LuxRender limits. Shininess is one of the big headaches; a Specular Color setting of e.g. medium grey which gives a mild sheen in D|S is the equivalent of a literally unnatural gloss in LuxRender. The values need to be turned way, way down.
Go into the Surfaces tab, select all the skin surfaces on your figure, find the Specular Color parameters and darken the colour. (Easiest way to do this; click on the colour swatch to get the Select Color dialog, then look at the Hue/Sat/Val numbers above the OK button. You need to bring the Val number right down, I usually never go above a value of 50 even for a really shiny metal or plastic surface.)
Yay ... you helped me .. I LOVE you!!
Cos this problem has been pissing me right off. It's amazing all of these crucial things about DAZ that you absolutely need to know but you won't find mentioned anywhere. I guess it's kinda hard t list it all but damn .. there should be a manual for 'weird things that'll piss you right off' :D
Thanks for this, I'm gonna go get this out and see what the outcome is. I had imagined it might be something like this. Oddly enough the characters legs are nice and shiny but they made me crop the damn picture ... fail to see what the hell is wrong with having a big black circle over his naughty bits ... what age are we here .. 12? Anyways .. again my thanks and it'll be great to make some progress with LuxRender.
It's too bad the Lux takes so damn long to render a decent image .. it'd be nice to use it for animation but that'd take weeks to render even 15 seconds of animation.
My demon boys thank you very much :D
Some of our members could indeed be 12 year old's, for real. We have one member who was participating in contests ( and winning) aound 6 years or more ago and she is stiil in her teens even now and doing promo images for one PA group..
BTW I did really LOL when I saw your thread title and then the image with the black spot. :coolsmile:
When I was 12 I was DREAMING of naked men!! Besides which I'm looking for technical help and it's not like you'd see anything in the original image that you wouldn't see on any given GQ magazine .. I made sure my demon boy was 'decent'!
Dunno why everyones afraid of a naked body .. we've all got one!!
Anyways, I have an answer to my problem .. and even though I'm till getting those damn white splodges .. at least I know what's causing them. Time to hit the tutorial vids on youtube. I HATE having to read the damn instruction manual .. it's like I'm 'failing' somehow.
Their site their rules so you may want to read the TOS.
or in this case the link I gave http://www.daz3d.com/forums/discussion/3279_11/ Which explains that added spots or bars are so tacky, nudity has to be concealed within the render.
FWIW, it is possible to use Luxus/Reality for animation. In LuxRender, the measure of render quality is Samples/Pixel — instead of running the render "until it looks good", you can specify to render each frame of the animation until it hits a set S/p value. And this doesn't have to be as high as you'd need for a still image, the blurring as you go from frame to frame fools trhe eye into not seeing the imperfections. There are a few other settings that must be changed for LuxRender animation, though, but as I've never gone into it myself I'm not too sure of the exact details.
And it is still going to take a very long time to render anything. :-S
Incidentally, do you know about the LuxRender wiki? Lots of useful details, although you will have to beware of exact how-to-do-it instructions for the Blender version of LuxRender...
I'm tempted to try it .. after arsing around with Lux for a few days now I'm really getting the hang of lighting and I gotta admit the renders do look superb. Too bad I can't post any here .. My boys are just too much for the bashful :P But anyways, yes I'm loving the luxus plugin. I also have Reality 4 but I haven't had any real luck getting a decent render out of that yet. Though admittedly I've really got to find out how to use that.
Have no idea what the hell a mesh light is and how the hell it works .. it seems to do nothing at all. But as I've found out recently, there's probably some stuff to do to make it work it's magic.
Cool beans ... thanks everyone for chiming in.
Mesh lights are usually the best way to light a scene for LuxRender, but they are a bit tricky to get used to. Do you have the bundle of free scenes and bits and pieces for Luxus? That has a test scene with mesh lights in it, that you can take apart to see how they work.
All they are, basically, is a 3D object in your scene with a special LuxRender material applied to it, so that it emits light. This can be a primitive you add to your scene, or an existing object, e.g. a light bulb, that you can make glow.
How to do it (in Luxus, I don't have Reality so I can't say how that works). First, select your object (whether an existing one or a new primitive) then go into the Surfaces tab and select the material you want to glow.
Click on the Options button (top right corner of the tab, looks like a set of lines) and select "Luxus - LuxRender Material" from the menu that drops down. This will add the new surface parameters.
Click on the "Light Parameters" tickbox, and in "Material Type" select "Null". There are extra wrinkles you can use at this point, but let's get the basics done first.
You now have the extra parameters in the Surfaces tab. Scroll down to the bottom of the list to see them.
Click the "Enable" switch to turn the light on, otherwise nothing happens.
Color can be set to whatever you want, just like any other material. You can also apply a texture map, but (again) this bit is tricky to get right.
The default Power setting is a bit on the low side, especially if you aren't lighting a small enclosed space like a room. Remember, LuxRender light behaves pretty mich like real-world lighting; when your computer is calculating a light beam that doesn't hit something, but goes waytheheckoutthere forever, it slows down the render. Try values of 200-1000 until you get a bit more experience in what kind of numbers work best.
The other parameters can be ignored for the moment, they control other ways to set up a mesh light.
If you're using a primitive, move it to wherever you want the light to come from. Note that the light is emitted all around your object; a flat primitive should be turned to "face" whatever you want lit for best results.
Cross your fingers and hit the "render" button. There are other controls in the LuxRender GUI to adjust lights while the render is running, I'll go into them later. The wiki site I linked upthread goes into some detail on this, but it does get a bit technical.
Good luck (you'll need it). :ahhh: