[Radiance-general] Rendering parameters help and weird colors

[Guglielmetti, Robert]

Hi German,

I understand, but the problem with modeling far-reaching terrain is that the spacing between your ambient sampling points blows up quite a bit. What I generally recommend is that you substitute the actual mountain with proxy geometry closer to the building (say, within 100' of the building perimeter) that represents the shading effect of the distant ground. In other words, project the mountain onto flat polygons closer to the scene-

...and Greg just chimed in with a better answer. =)


From: Germán Molina Larrain [mailto:gmolina1 at uc.cl]
Sent: Wednesday, April 17, 2013 10:35 AM
To: Radiance general discussion
Subject: Re: [Radiance-general] Rendering parameters help and weird colors

On the other hand, the reason I modeled the mountain is to actually consider the shading it provides (that is the area I am working on)... so I think just eliminate it would not be the solution.

Is color bleeding a problem that "would occur in real life"?? I mean, is a modeling problem (clearly the mountain is not completely brown), or a weird effect of the algorithms involved?

THANKS AGAIN!

German

2013/4/17 Germán Molina Larrain <gmolina1 at uc.cl<mailto:gmolina1 at uc.cl>>
Hi Robert,

My material definition was the following (I assume it is easy to notice what is what)

void glass SL_glass
0
0
3 .92 .92 .92

void plastic GroundMat
0
0
5  0.435 0.306 0.216  .00 0.06

void brightfunc floorpat
2 .4*rand(floor(Px/.25)-.25*floor(Py/.25)-.25)+.6 .
0
0

floorpat plastic Floor
0
0
5
    .3 .3 .3  0 0


void plastic SL_default_material #(basically every wall and ceiling)
0
0
5 .7 .7 .7 0 .01

My ambient parameters were (the rest are all defaults):

-ab 8 -ad 2000 -aa 0.05 -ar 256

THANKS VERY MUCH

German

2013/4/17 Guglielmetti, Robert <Robert.Guglielmetti at nrel.gov<mailto:Robert.Guglielmetti at nrel.gov>>

Hey German,

For sure it looks like there is some color bleeding, and also the fact that you have modeled the entire mountain - making your model extents fairly large relative to the area of interest (your building interior) is likely causing you some pain here too. It would be helpful to see your material definitions, and also your rendering parameters (particularly the ambient (-a*) ones).

Rob Guglielmetti
National Renewable Energy Laboratory (NREL)
Commercial Buildings Research Group
15013 Denver West Parkway MS:RSF202
Golden, CO 80401
303.275.4319<tel:303.275.4319>
robert.guglielmetti at nrel.gov<mailto:robert.guglielmetti at nrel.gov>



On 4/17/13 10:12 AM, "Germán Molina Larrain" <gmolina1 at uc.cl<mailto:gmolina1 at uc.cl><mailto:gmolina1 at uc.cl<mailto:gmolina1 at uc.cl>>> wrote:

Dear List,

So I have been rendering with some interesting features in SketchUp, like exporting landscapes (hills and mountains) from GoogleEarth.
Here is a link for you to understand what I am talking about<https://www.dropbox.com/sh/ltv125db6hjp74a/hsnL6S-_JI>

Anyway, I have been rendering some stuff and I have two doubts:

1.- My environment is basically grey, but only the mountain near my building is brown; but everything has turned to be brown (as can be seen in Image2)... is that the "color bleeding" (or something like that)? Is that a good result? or there is a problem with my modeling?

2.- As can be seen in Image (the one that shows the interior of the building, looking out), there are some weird effects, making my image to look as it was painted with a brush or something. What is the parameter that would help me reduce that?

I am not sure why in Dropbox the images look much more darker than in my PC. They were created using rpict, and then filtered with "pfilt -x /2 -y /2 image.hdr > image.tiff"

THANKS VERY MUCH

German
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