Sttencil Buffer Shadow Overlapping

OpenGL OpenGL: Basic Coding
1

If i have more than a single one point light, how to create real-visible effect of the shadow overlapping? I suppose using glBlendFunc() but dunno how.Please help!

2

You do a multipass solution:

For each light:

  1. Clear the stencil buffer
  2. Create a stencil mask from light ‘n’
  3. Add the light from light ‘n’ to the unmasked regions.

/A.B.