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I just found some where a document about "Smoothie". It is a soft shadow technique that make good soft shadow quickly.Take a look :


1 sample is render using an ordinary shadow map;
bicubic is render using a version of PCF with a bicubic filter
2 last collums is render using smoothie

So, for 1024 x 1024 shadow map, 1 sample takes 17ms , bicubic takes 142 ms and smoothie is 24 ms.

I think Ogre had 1 sample and PCF already, and it'd be nice if it had smoothie also. And can someone plz make a sample app and post here.

Go here and see : (Cg vertex and fragment programs included)
http://people.csail.mit.edu/ericchan/papers/smoothie/

Sorry for my bad English !

This is definitely NOT something Ogre needs to be integrated, it's just another possible technique to integrate for your project (just like the VSM I posted). Not just that, but this is actually a very quirky technique to implement, since you need not only 2 shadow maps, but the second shadow maps needs to extrude degenerate quads from the mesh, which is pretty much what stencil shadows do.

Oh yes, I forgot that. But believe me, this would be the fastest technique to make soft shadow. Far better than using PCF + Gaussian blur. Try it out. I'm thinking how to use it.

_Anonymous wrote:Oh yes, I forgot that. But believe me, this would be the fastest technique to make soft shadow. Far better than using PCF + Gaussian blur. Try it out. I'm thinking how to use it.

Ok, but what I'm saying is that it is not an all-in-one solution to the "fasted" general-case "real" soft shadowing. Why? Simply because it requires a second shadow map rendered with degenerate quads extruded from the geometry, which defeats the purpose of general-purpose image-space shadowing.

There's that, and it's definitely *not* the only fast shadow mapping method out there. LVSM, ESM, CSM, and a lot of other shadow mapping methods exist out there.

Yeah, alot of tecniques. Each of them has advantages and disadvantages. So the best way is to implement all of these techniques into a demo, and it will give us fair comparitions.

_Anonymous wrote:Yeah, alot of tecniques. Each of them has advantages and disadvantages. So the best way is to implement all of these techniques into a demo, and it will give us fair comparitions.

Good luck There's only - what's the figure now? - about 200 or so. Do a search for "AndyTX" on Google and prepare to have your head spin.

You are funny. I mean just the techniques that are most popular.

_Anonymous wrote:You are funny. I mean just the techniques that are most popular.

Everyone on this forum is crazy!

And you're in too, ha ha