Direct Illumination?

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Old 09 September 2013   #1
Direct Illumination?

Hi there,

I know that GI is Indirect Illumination, but I've been doing some google search without much luck with finding a proper explanation of what the term "Direct Illumination" means and actually do.

Perhaps some one here can lead me in the right direction?


Regards
 
Old 09 September 2013   #2
Red face Direct illumination

Hi mate,

The direct illumination is when your scene/objects are getting the light straight from a light surse. Ofcourse to obtain realistic renders you need to use global illumination aswel, it's not fun because it increases your render times but! gives great results.

Example 1

Put an 3d apple under a straight light, you will see that in your render it will appear only the apple. If you add GI, then everything around the apple will reflect/refract give nice bling blings and you can even see unfinished parts of your scene

Example 2

Take a flashlight, close the lights in your room at night, direct the flashlight ray to a wall, what you see there is something under a direct light so thats direct illumination.

Hope that I managed to bring some direct illumination to your thoughts, have a great render day!
 
Old 09 September 2013   #3
Hi Cristian,

So the term "direct Illumination" is basicly just Scanline rendering, such as in using lights that does not bounce from the surface it hits.. Thanks for clearing that up.

Last edited by knekker : 09 September 2013 at 09:19 AM.
 
Old 09 September 2013   #4
Not to be confused, scanline is just a rendering algorithm. Any algorithm can do direct illumination.

As long as you're shining light straight onto your subject without any bounce, it is a direct illumination.
 
Old 09 September 2013   #5
What Panupat said is very true, I was refering only to actual lights : photometric/standard/vray...etc.
 
Old 09 September 2013   #6
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