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Happy SDE

Shadows theory.

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I’ve implemented a spot light and placed it under big plate (1).
 

[attachment=30140:Shadow Question.gif]

On top of the plate I’ve placed two smaller plates: (2) and (3) with a little space between them.
 

There are 2 problems:
   a. My shader calculates color for plate (2) as it is not occluded by plate (1).
   b. Bottom of a plate (3) is rendered much brighter than it should be.
 

It seems for me that the only way I have, is to implement shadows to remove these artifacts.
Question1: is it correct?

 

I’ve read that there are several different ways to implement shadow effects:

  1. Via shadow mapping.
  2. SSAO
  3. SSDO (improved SSAO?)

I have an idea that Shadow maps should be used with SSAO/SSDO to make final image better.
Question2: is it correct?

 

SSAO or SSDO alone will not completely fix artifacts (a) and (b) on the picture.
Question3: is this correct?

 

For now, I am thinking on some simplest shadow algorithm implementation and after a while replace it with more advanced.
Question4: which algorithm would you suggest?

 

Thanks in advance.
PS: I am using real-time rendering.

Edited by Happy SDE

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Also, while choosing a shadowing algorithm, keep in mind that different algorithms are better suited for different situations. For instance, in a large outdoor area with a single directional light (e.g. the Sun), many use cascaded shadow maps, while indoors for instance variance shadow maps.

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