PCF Soft Shadow

What should i change to be able to render more objects or bigger objetcs?[/quote]
Cascaded Shadow Maps

and i haven't got the result that i was expecting[/quote]
Because PCF sucks. It eats a lot of samples and produces results based on the aliasing of the projected shadow map. Try Variance shadow maps or screen space soft shadows.

To get rid of that acne on your objects, make sure all surfaces with a normal pointing away from the light are set to shadowed in your shader, that eliminates all acne.

I have try Variance shadow map on the small map (the 5x6 one)

here is the result:
http://www.youtube.c...h?v=yI_ERZQJwBI
it's kinda weird, i'm probably doing something wrong.

and thank you for the cascaded shadow map, i have start reading on it. Just to make sure i understand, i should try to render the small map perfecly with VSM then try to add more block and bigger construction and implemented cascading shadow map?

Because PCF sucks. It eats a lot of samples

N.B. most GPU's since GeForce 3/4 have supported doing the PCF test in the texture-fetch unit, giving you 4-sample PCF results for the cost of 1 sample, so a basic 4-tap implementation doesn't use any more samples than regular 'hard' shadow mapping.

Well correct, But a 4-tap isnt going to produce soft shadows. So you get a tiny little bit nicer looking image, but not good just by itself. So to Panda, you can always get 4 sample PCF for free. If you set your glTexParameter to GL_LINEAR.

With Cascaded shadows you just take multiple snapshots of your shadow. So you take your light matrix and keep closing its field of view smaller. So you get one map to project to a small 3x3 unit area, then another one with a bigger FOV will map to a 20x20 area, and so on till it is maybe 1,000 x 1,000 GL units. And for each pixel, you determine which map you should use because you want the map that has the best resolution.

Okay i have successfully implemented VSM shadow :

Now i want to use cascading or parallel split to do bigger map, should i implement that first or multitexturing? (ex: put a brick decal on the wall)

thank you

The VSM looks strange. Also use glTexParameter CLAMP_TO_BORDER, and set glTexParameter Border Color to 1. This way you don't get black outside of the shadow map areas.