Weird wavy lines and streaks

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crc
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Weird wavy lines and streaks

Post by crc » Fri Jun 22, 2007 12:08 pm

Attached is a crop of an outdoor/night scene I am working on.
If you look at the entrance doors, the aluminum mullions are all wavy looking, and there looks like an overlay of some sort of little lines instead of noise.
Hopefully this makes some sense when you look at the pic, most noticeable in the wall and the car.
But it is throughout the whole image, and all the mullions are wavy like that. The material is the Aluminum preset in Skindigo.

Any ideas? :?
Attachments
med_crop.jpg
After 26.5 hours rendering.
med_crop.jpg (19.94 KiB) Viewed 2787 times

crc
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Location: Portland, Oregon

Post by crc » Fri Jun 22, 2007 12:10 pm

and here is the full scene.
any other comments or suggestions is greatly appreciated. :)
Attachments
med.jpg
26.5 hours rendering-
Sketchup + Skindigo
latest versions of each.
med.jpg (39.84 KiB) Viewed 2786 times

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BBjam
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Post by BBjam » Fri Jun 22, 2007 5:48 pm

looks like compretion: Did the lines show up before you turned it in to a jpeg?

crc
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Post by crc » Sat Jun 23, 2007 3:44 am

Yeah, they are there. I am using an exr map, maybe that has something to do with it?

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suvakas
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Post by suvakas » Sat Jun 23, 2007 4:07 am

Nice image!!

Whats the scale of your scene?
I remember reading from somewhere, that if the scale is too large, then some strange things may happen. (similar to the lines you have)

crc
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Post by crc » Sat Jun 23, 2007 4:25 am

thanks Suvakas-
the scene is 2000x1000.
I did this scene before, daylight scene, and it had the wavy line things at the mullions, but not the streaky things covering the whole image.
I am using the "Thin Glass" preset that Whaat came up with, maybe it's just weird reflections or something.

On another note, there is something really satisfying about making a cars headlights! :D

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suvakas
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Post by suvakas » Sat Jun 23, 2007 5:43 am

Yeah, the tail lights were the first thing that got my eye. I forgot to comment about it.
Looks cool.

2000x1000? In what units?

crc
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Post by crc » Sat Jun 23, 2007 5:49 am

pixels-
it's how the camera is set up in skindigo, not sure about other programs.

I was hoping to get a good exponent map on the asphalt to get some of those little highlights, but no luck. just a render for fun anyways.

the streetlights aren't near powerful enough though. and I'm using a night time exr map, but it isn't coming through at all. :(
oh well.
:)

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suvakas
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Post by suvakas » Sat Jun 23, 2007 6:20 am

I meant like how high/wide is your building in Sketchup? In meters for example?

Here's the link to the thread i was talking about.
http://www2.indigorenderer.com/joomla/f ... =commodore
Check the image Whaat has posted. Some strange AA issues there too. But then again..not very similar to what you have.

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Whaat
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Post by Whaat » Sat Jun 23, 2007 6:21 am

crc,

I have had the wavy lines problem too. See the golden gate bridge render in this post: http://www.indigorenderer.com/joomla/fo ... c&start=15
I don't see how it would be caused by Sketchup or SkIndigo, though. If you reading this, Ono, do you have any idea what would cause this??
You should be able to see your EXR map if you keep increasing the gain.
@suvakas: Obviously, crc is referring to the image dimensions, not the scene scale. I would guess that his model is drawn to real-world scale unless it was imported from another app.

crc
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Post by crc » Sat Jun 23, 2007 6:27 am

Whaat wrote:crc,

I have had the wavy lines problem too. See the golden gate bridge render in this post: http://www.indigorenderer.com/joomla/fo ... c&start=15
Yep, that's the same thing.

Whaat wrote:You should be able to see your EXR map if you keep increasing the gain.
Increase the gain in Violet? OR? not sure if I know where to do that.

Whaat wrote: @suvakas: Obviously, crc is referring to the image dimensions, not the scene scale. I would guess that his model is drawn to real-world scale unless it was imported from another app.
oops, yes, drawn to real-world scale.

Whaat -have you ever modeled a scene, than scaled it down? Hadn't thought of that before, maybe faster render times?

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suvakas
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Post by suvakas » Sat Jun 23, 2007 6:29 am

Really strange issue.
I've never seen this in my renderings.
A bug? :roll:

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Whaat
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Post by Whaat » Sat Jun 23, 2007 6:34 am

crc wrote: Increase the gain in Violet? OR? not sure if I know where to do that.
You can increase the gain in Sketchup in the 'Set Environment Map' dialog.
Whaat -have you ever modeled a scene, than scaled it down? Hadn't thought of that before, maybe faster render times?
I have never tried this because, I believe, it would not make a difference.

tinman999
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Re: Weird wavy lines and streaks

Post by tinman999 » Sat Jun 23, 2007 7:37 am

crc wrote:Attached is a crop of an outdoor/night scene I am working on.
If you look at the entrance doors, the aluminum mullions are all wavy looking, and there looks like an overlay of some sort of little lines instead of noise.
Hopefully this makes some sense when you look at the pic, most noticeable in the wall and the car.
But it is throughout the whole image, and all the mullions are wavy like that. The material is the Aluminum preset in Skindigo.

Any ideas? :?
Are you using v0.8? if so the artifact could be caused by RQMC used in v0.8. Try v0.7 and see if the same artifact appears.

crc
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Location: Portland, Oregon

Post by crc » Sat Jun 23, 2007 8:50 am

Whaat wrote:
crc wrote: Increase the gain in Violet? OR? not sure if I know where to do that.
You can increase the gain in Sketchup in the 'Set Environment Map' dialog.
See, if you put this stuff in really arbitrary hard to find places, THAN I'd probably be able to find it :roll:
:lol:

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