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Subject: Bug or not? Lighting in scenes with no light possible

Mahray opened this issue on Nov 04, 2006 · 5 posts
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Mahray ( ) posted Sat, 04 November 2006 at 9:41 PM · edited Mon, 25 November 2024 at 1:25 AM

I thought I'd start a new thread about this, as I'd hijacked the one on HDRI and better shadows a bit too much.

Inside of a booleaned cube (think a sealed box), I have a sphere.  The mats on the sphere and cubes are all from MadMax's HDRI mats set, with no ambiance.  The sun is disabled.

In that sort of setup, there should be no light source.  I rendered the scene twice, once as described, the second time with AS's HDRI to provide light.

Upon rendering, both scenes appeared completely black (as you would suspect).  However, the HDRI version took over 50 minutes to render, which was interesting in itself.

To see what took so long, I firstly adjusted the levels of the image, and then brightened the gamma significantly.  I did so for both renders.

Come visit us at RenderGods.

Ignore the shooty dog thing.

Mahray ( ) posted Sat, 04 November 2006 at 9:42 PM

file_358583.jpg

Image 1 - HDRI render, adjustments as discussed.

Come visit us at RenderGods.

Ignore the shooty dog thing.

Mahray ( ) posted Sat, 04 November 2006 at 9:43 PM

file_358584.jpg

Image 2 - Non-HDRI render, similar adjustments as first.

Questions raised by this:

Why? / What is going on here?

Is this actually a bug or just a quirky feature?

Am I completely insane for bothering with this?

Come visit us at RenderGods.

Ignore the shooty dog thing.

Svarg ( ) posted Sat, 04 November 2006 at 9:48 PM

Researching the UNKNOWN is never wasted time.

"Imagination is more important than knowledge." - Albert Einstein

Rayraz ( ) posted Sun, 05 November 2006 at 7:03 AM

are the shadows set to 100%?

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