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Kerkythea Rendering System • View topic - How much softshadow on Sun light
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How much softshadow on Sun light

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Rafa

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Post Tue May 20, 2008 8:32 pm

How much softshadow on Sun light

The Sun diameter is about 1,392,000 km
The average Sun distance to Earth is 149,597,871 km

1,392,000/149,597,871=0.0093

About .01

Translating this means that if you have an object at 1m from floor, at 12:00, the fallof could be 1 cm (0.93cm) ;)
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SunSoftShadow.png
Last edited by Rafa on Wed May 21, 2008 3:53 pm, edited 3 times in total.
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alex

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Post Tue May 20, 2008 8:41 pm

did you take into account that pollution particles in the atmosphere diffract the sun rays, and therefore, give some more blurry shadows ? :?


Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.
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Rafa

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Post Tue May 20, 2008 9:06 pm

It is just a round number. I'm posting this becouse I have seen some good interior renders, but look somehow out of scale becouse the fall off of direct sunlight looks about 20cm, meaning that the window must be at 200mts.

I have done some field mesurements and more or less looks correct, but its too dificult to mesure where the shadow begins and the "coldspot" begins.

There are a lot of atmospheric elements that can affect of course, crystals on high atmosphere, clouds, dust, or even the eliptical orbit of the planet, or longitude-latitude, etc.

Just a general tip.
Last edited by Rafa on Wed May 21, 2008 12:12 am, edited 1 time in total.
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Fletch

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Post Tue May 20, 2008 10:12 pm



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Rafa

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Post Wed May 21, 2008 12:21 am

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Fletch

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Post Wed May 21, 2008 2:57 pm



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Rafa

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Post Wed May 21, 2008 2:58 pm

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sintra

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Post Wed May 21, 2008 3:17 pm

Kind regards

Darren

Sketchup6 & Kerkythea
Dell Precison M90 notebook, Intel Core 2 Duo 2.33 Ghz, 4Gb of Ram, nVidia Quadro FX 2500M

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http://www.flickr.com/photos/darrengoodwin/show/
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Avariant

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Post Wed May 21, 2008 3:23 pm

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Rafa

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Post Wed May 21, 2008 3:44 pm

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Fletch

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Post Wed May 21, 2008 6:28 pm



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rossgalloway

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Post Wed May 21, 2008 8:09 pm

I assume this "2" is going into the Radius box in the lights tab in scene settings?
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Fletch

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Post Wed May 21, 2008 11:47 pm

indeed.



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