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Ambient Occlusion

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Not sure if this is correct but it seems a bit 'off' with what should happen (at least in my head).

 

In the images attached I have two planes which are 500m apart. If I set the AO size to 100 then there is no shadowing on the lower plane. I would expect this. If I then set the size to 1m I see shadowing. Once again I would expect this. Finally I set the AO size to 510mm and very little shadowing appears even though I would have expected it to be the same as the 1m test.

 

Am I missing something here?

 

thanks

100.png

1m.png

510.png

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I think that is right.

 

If the other object is out of set sizes reach, no darkening will apply.

If the object is in reach, there will happen "some" darkening.

If both objects are touching, distance = 0,00, AO will darken to a 100% black.

If the distance between object = max distance, there will be no darkening or

better said, the start of the darkening.

 

So if your objects are 500 mm away and your AO distance is set to 510 mm,

500 / 510 = 98% of AO size.

That means that the darkening will be a 1/98% = 2% Black only,

Which will be hard to notice.

Edited by zoomer
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About ambient occlusion. For my white models, just to check forms before adding any textures, I typically give it 100% and a short distance, just to see those edges a bit darker. Here is a recent project.

 

Screen_Shot_2017-04-18_at_8_48.46_AM.png

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Thanks Zoomer/Luis

 

great render btw. Did you make or import the chairs?

 

thanks again

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Luis example is exactly the proposed usage for AO.

 

To "fake" shadow details in small scale areas where they are missed by GI calculation

or would need too much render time.

It also helps for modeling in OpenGL where you could not differentiate surface details

of larger objects of one single material.

 

It is not thought to be used as a complete Shadow Replacement for large scale objects like

complete buildings, like it was often used to fake shadows in computer games.

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2 hours ago, Luis M Ruiz said:

About ambient occlusion. For my white models, just to check forms before adding any textures, I typically give it 100% and a short distance, just to see those edges a bit darker. Here is a recent project.

 

Nice example! What's the distance set at for a rendering like this?

 

KM

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I originally found the chair I needed but all the meshes slowed the model so it was decided to recreate objects "in house".

 

Screen Shot 2017-04-19 at 9.28.11 AM.png

Screen Shot 2017-04-19 at 9.27.44 AM.png

Screen Shot 2017-04-19 at 9.27.34 AM.png

Screen Shot 2017-04-19 at 9.27.59 AM.png

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Thanks for these insights Luis, your experience and knowledge is invaluable. So much to learn, so little time.

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There is so, so much to learn indeed. Fortunately I am surrounded by a team of experts in 3d, renderings, bim, spreadsheets, graphical scripting and more. Always happy to share.

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