I've been working on soft shadows in OpenGL, however I got problem with gradients: Shadows:

http://i38.tinypic.com/155i1vk.jpg

you can notice on above image the lines on each edge Method of drawing (triangles):

http://images.gamedev.net/features/programming/2dsoftshadow/03HullGeneration.gif

My question is: Is there any method to fix this or any work-around (I'm talking about lines one each edge)? p.s. you might notice the shadows are just black & white. This is because I haven't added blend mode to it. Don't worry about that :) ~Keth

http://i33.tinypic.com/2rr4ec1.jpg

Not really, you can still notice it with blend mode added (especially on the left side). I tried ALL combinations of blend modes even combining them (15*15 = 225 combinations) however, none of them are correct.
However, extending the shadow and adding another vector point would slow down a lot. I really care about the speed.

p.s. I will be adding penumbra as soon as I will finish this part.

Edit: Oh, you are OrangyTang! Awesome article man. :)
Edit2: You are right about blending, however on the picture in this post it's caused because of the static shadow length. I will think about changing the method.

[Edited by - Kethor on October 12, 2008 7:51:39 PM]

OrangyTang, could you please explain a bit more what you mean by saying "extend two (or more) lines per shadowed vertex"?

Do you mean something like this?

http://i33.tinypic.com/5b3gb4.jpg

If yes then there is another trouble with that:

http://i33.tinypic.com/15cgcue.jpg

Anyone else having any idea about that?