[Source, Library, Sample] Parallel Split Shadow Mapping that you can re-USE

[Mietze]

Just a shot in the wild: Did you try outputting the depth map projected on the actor to see if it's there?

[Toaster]

Yeah he seems to be there on all four splits. its rather weird I think its something to do with the UV's maybe? idk..

[Mietze]

And what happens if you only output the respective color channel (current split) of the depth map?

[Toaster]

Not sure how to do that. lol Would that mean rendering only one split to the surface? Thanks for all the help so far!

-Toaster

[Mietze]

Code:

float4 PS_Shadowed(VS_SHADOWED_OUTPUT IN) : COLOR
{
  half fSplitIndex = GetSplitByDepth(IN.vDepthAndTextureUV.z);
  float fColor = tex2D(sampShadowMap, faSplitUV[fSplitIndex].xy)[fSplitIndex];
  return float4(fColor.rrr, 1.0f);
}

[Toaster]

Hmm that renders the actor black. Least we are getting closer. lol

Edit:
Im running into light bleeding problems when using the shadows in screenspace. As you can see from this screenshot:



Now I know I need to somehow check the depth map to fix this but im not entirely sure how I can do this. In my composite shader I do..

Code:

float4 colors =  Color * ShadowFinal;

and even without a blur I still have light bleeding. Can I even run a check in the composite shader? If so how can I do this?

Thanks for all the help so far!

-Toaster

[Zaknafein]

I already spoke a bit with him about this on MSN, but here goes : the point of ESM/VSM is to be able to blur the depth map instead of performing a screen-space blur afterwards. This also fixes the problem that all depths from the camera have the same amount of blur. So you should blur the depth map instead of the composite.

[Mietze]

So you should blur the depth map instead of the composite.

Agreed

[Toaster]

I finally got it!  PSESM with a Gaussian blur shader on the depth map.

Blurred is on the right and no blur is on the left.
http://img4.imageshack.us/img4/1282/psesm.jpg

This is using a 1024 depth map and a 9 tap Gaussian blur.

Thanks to Mietze for all his help specially with the PSSM/ESM and thanks to Zak for the Gaussian blur shader and helping me to apply it to the depth map properly.

-Toaster

[sybixsus]

When you say a 9 tap blur, do you mean 9x9 or 3x3? If it's the latter, I must be doing something wrong with my blur.

[Toaster]

I believe its a 9x9. I don't know for sure cause I'm using zak's shader. Also make sure your depth map sampler(in your mesh/terrain shader) is setup to at least use linear filtering. Like:

Code:

texture texShadowMap;
sampler2D sampShadowMap  =
sampler_state
{
Texture = (texShadowMap);
MinFilter = Linear; //None, Point, Linear, Anisotropic(not sure what cards support which)
MagFilter = Linear;
MipFilter = Linear;
AddressU = Border;
AddressV = Border;
AddressW = Border;
BorderColor = 0x000000;
};

With that set to none it looks horrible.

-Toaster

[Zaknafein]

Yep, it's 9x9, and the shader's here : http://www.truevision3d.com/forums/showcase/post_processing_sample_componentservice_architecture-t18038.0.html;msg123793#msg123793

It goes up to 17x17 in a single pass! (well, horizontal + vertical, so I guess that's two passes)

[Mietze]

@Toaster: What about the per split kernel size?

[Toaster]

Ah there is no per split kernel size yet. So right now I get ugly lines where the splits meet up.

You can see it here:
http://img4.imageshack.us/img4/1038/linesw.jpg

I don't really get any other errors besides this line and its not top on my list of things to fix. I'm not even sure really how I would change the kernel size based on the split. Pretty sure with more hard work I can eventually figure it out though. lol

-Toaster

[Mietze]

However, I'm glad that you've got it working

[winspy]

hi there,
i am trying to modify the light pos,but the light/shadow map's color is keeping changing,why?how to fix this?

[Mietze]

Since its using a directional light, there is no light position at all!

[winspy]

wrong input,i mean change the light direction vector

[Mietze]

When you move the lights direction, the shadow maps color will also change. Since its a representation of depth, this should make sense, shouldnt it? If I didnt understand your problem, please point me in the right direction with screenshots or something

[winspy]

just curious,so when the light direction changed we can just see some colorful shadows??
what should i do when i want to use this in my game?
that's weird to see colurful shadow(usually we see black/gray shadow)!!!
sorry may be i am too new to understand this!!(just use tv for a little while)