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Vue F.A.Q (Last Updated: 2024 Oct 26 8:50 am)



Subject: Volumetric strangeness?


zoon ( ) posted Mon, 17 September 2001 at 12:11 PM · edited Fri, 08 November 2024 at 7:09 PM

Here is a message I have just sent to e-on: "I made a volumetric atmosphere, had the sun in the frame, and placed a test object in its path. I got volumetric shadows. The problem is, I have rendered this simple scene with volumetric intensity for the sun set to 0.1, and set to 10, and I can find absolutely no difference in the two images. I've done lots of set-ups, and every pair I render, the volumetric intensity setting seems to have no effect. When I take the sun out of the frame, and put a new directional light in the frame, I can't get ANY volumetric shadows from this light. Spots and point lights work perfectly. Am I not understanding something - maybe. I went to check this on my work machine which still has 4.00 on it, and found the same thing, and also on my laptop running 4.02." Anyone tried this - spot lights give a vast change when I alter the volumetric intensity, but the sun gives no change, and directional lights give nothing.


Kurka ( ) posted Mon, 17 September 2001 at 1:06 PM

Same here,- Fernando.


Cheers ( ) posted Mon, 17 September 2001 at 2:00 PM

Try changing the shadow intensity beyond 100%..you will find that the shadows cast will be more noticable then. Hope that helps, Cheers

 

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Cheers ( ) posted Mon, 17 September 2001 at 2:04 PM

file_211340.jpg

Sorry...forgot to post the image. Cheers

 

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gebe ( ) posted Mon, 17 September 2001 at 2:15 PM

Same for me, Adrian. I have told this already to Nicholas when we was at end beta and again when Vue 4 just came out and I did what Cheers is mentioning above. Nicholas told me that it is a nonsense to bring up shadow to 200, 300 (or even more) and out of any logic. Normally I agree, but technically there seems no other way to get it. Guitta


zoon ( ) posted Wed, 19 September 2001 at 12:14 PM

I'm glad its not just me. I take the point about typing in values above 100, this works for many Vue functions, but what do we do if we want to reduce the intensity?


gebe ( ) posted Wed, 19 September 2001 at 12:56 PM

file_211342.jpg

You mean redouce shadows ?


gebe ( ) posted Wed, 19 September 2001 at 12:59 PM

file_211343.jpg

or intensity of the sun ?


zoon ( ) posted Wed, 19 September 2001 at 1:05 PM

I mean reduce intensity of the shadows. I found that 0.1 was exactly the same as 100. Ho hum.


Cheers ( ) posted Wed, 19 September 2001 at 2:08 PM

If you mean the intensity of the shadows that fall on objects, then the best way is to start your scenes (any scenes in any software) with 0% Ambience assigned to the materials of all objects, and in Vue also set the light balance to 100% in the Light tab of the Atmosphere Editor (this setting option will control shadow darkness). The strength of shadows should always be adjusted with fill-in lights for greater or more realistic control...unless you have access to radiosity within the software. Cheers

 

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zoon ( ) posted Thu, 20 September 2001 at 12:32 PM

file_211344.jpg

Thanks cheers, but that's not what I'm looking at. The 'problem' is the shadows cast in the air in a volumetric atmosphere. Here is a pic with vol intensity set to 100. The next message contains the same pic set to 0.1. Can you spot the difference?


zoon ( ) posted Thu, 20 September 2001 at 12:33 PM

file_211346.jpg

here is the pic with volumetric intensity set to 0.1


Cheers ( ) posted Thu, 20 September 2001 at 12:50 PM

Okay zoon, Looks like you have a bug there. There does seem to be little point in having settings that don't work below 100%. The only other suggestion I can come up with is to turn down the haze and/or fog in the atmosphere editor, to lessen the contrast. Obviously that may have other less desirable effects elsewhere in your render :( Cheers

 

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