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Author Topic: Is this a known problem with ART?  (Read 9516 times)

Kyle

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Is this a known problem with ART?
« on: August 11, 2009, 06:10:37 am »

See how the lighting behaves oddly here? the side paneling for example fades away completely for no apparent reason.  And the side of this night stand as a similar effect going on.  not sure if this counts as a bug, or just a short coming of the render, but I cant think of any reason this should happen.  it gives it a flat look to the shadowy parts of the image.





« Last Edit: August 11, 2009, 06:14:03 am by Kyle »
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lynn22

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Re: Is this a known problem with ART?
« Reply #1 on: August 11, 2009, 10:46:42 am »

It could be staring me in the face but I see no problem with these renders. Things that are in the shadows don't have volume/body so you can't see them.

Very nice renders though :)
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floyd86

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Re: Is this a known problem with ART?
« Reply #2 on: August 11, 2009, 11:03:06 am »

You showed these renders on cgn too. I see the problem, but i don't know if it's actually a problem. The panel indeed fades away...
Did you use a bumpmap for the panels or is it modeling?

Kyle

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Re: Is this a known problem with ART?
« Reply #3 on: August 11, 2009, 07:15:57 pm »

The paneling, and all the details I'm pointed to do have volume, their individually modeled.

But like I said, its not just the paneling, see the left of the night stand there? I see no reason it should appear fused together into one flat level like this unless the shadows were much darker
Also, their are pieces of wood under the crib that should have full volume, yet you'd think they were a texture they look so flat.

but thanks for the compliments.
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xalener

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Re: Is this a known problem with ART?
« Reply #4 on: August 13, 2009, 12:41:47 am »

I know what you mean. It seems some objects can't go darker than their own diffuse or something.
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karate5662

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Re: Is this a known problem with ART?
« Reply #5 on: August 13, 2009, 12:54:14 pm »

How many light sources are in your scene?
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Kyle

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Re: Is this a known problem with ART?
« Reply #6 on: August 14, 2009, 04:55:34 am »

One near each window, and another near the door, so 4 lights.
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xalener

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Re: Is this a known problem with ART?
« Reply #7 on: August 15, 2009, 01:26:59 am »

What I do is I add a local light that's near (but not all the way) pitch black to the dark areas.
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onespirit5777

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Re: Is this a known problem with ART?
« Reply #8 on: August 16, 2009, 09:38:38 pm »

Have you used AmbientOccluder in the scene mode?
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xalener

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Re: Is this a known problem with ART?
« Reply #9 on: August 17, 2009, 06:58:48 am »

That could also help....But it could also quadruple the already long rendering times too.
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Raxx

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Re: Is this a known problem with ART?
« Reply #10 on: August 17, 2009, 02:52:15 pm »

Just a suggestion, but perhaps you should stick with the scanline renderer until Steve fixes some of the bugs in ART and speeds it up again. The only real benefit from using ART in your scene is the small amount of reflection in the floor, window, and tabletop; otherwise everything can easily be handled by the other renderer and look just as good. Then by the time you're done with it, perhaps there'll be a new release (been almost a year since the last update, sheesh).
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Kyle

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Re: Is this a known problem with ART?
« Reply #11 on: August 19, 2009, 07:50:05 pm »

I'd love to try ambient occlusion, but I don't really understand it. and its hard to test something like that since its takes so much longer to render. 

Raxx, I don't think I'll be stepping back down from the non ray tracer, Ive actually held off taking this project seriously untill the reflection on the floor was possible in anim8or, and now that its finally happened Ive been moving forward with it. sure, I tried the usual transparent floor and mirrored underbelly of the scene, but it never quite looks looks right. and the reflective surfaces are an important element to making this whole thing work to me. I think Id rather put up with the bugs than step back down to scanline.
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onespirit5777

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Re: Is this a known problem with ART?
« Reply #12 on: August 25, 2009, 11:39:08 pm »

one other thing you could do is add some extra lighting in those areas. Make them all most black and work your way up from there. It would act as a type of AmbientOcculder but without the longer render time.

Use local lighting.
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hihosilver

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Re: Is this a known problem with ART?
« Reply #13 on: August 26, 2009, 04:04:43 am »

Did you try changing that material's ambient value to 0?  I believe it would work.
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Kyle

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Re: Is this a known problem with ART?
« Reply #14 on: September 02, 2009, 06:07:49 am »

yeah, I tried all that, this is the best I think I could get it to look.  extra lighting just makes the scene not make sense. you got shadows coming from places they shouldnt and all sorts of other problems.

lowering the ambient adds too harsh of a contrast between the dark and the light, and the flat areas still end up looking flat, just darker.  the ambient is needed unless I were to do a night scene (which I will do eventually but still).
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