Better blur effect

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Re: Better blur effect [Re: MrCode] #183444 02/15/08 08:19 02/15/08 08:19
Joined: Jan 2007 Posts: 1,619 Germany Scorpion Serious User
Scorpion Serious User Joined: Jan 2007 Posts: 1,619 Germany	just imagine a raster. and now imagine a circle in it.. now add all coordinates of the quads, which are in that circle to the array. btw: a faster way to blur ist to blur h and v in diffrent passes...

Re: Better blur effect [Re: MrCode] #183445 02/16/08 18:56 02/16/08 18:56
Joined: Jun 2006 Posts: 379 Flevoland, 5 meters under wate... Roel Senior Member
Roel Senior Member Joined: Jun 2006 Posts: 379 Flevoland, 5 meters under wate...	I saw you using values close to 1.00 a thing is: 1.00 is the size of a whole image. shader texture positions aren't counted in pixels, but floating point values from 0 to 1. 0 is the left, 0.5 the half, and 1 the right of the image. your blurring taps are moved so far, that they are getting out of range, at least, they leave the original pixel. for blurring, use values from 0 to 0.01 as someone said before Check out the throwing game here: The throwing game

Re: Better blur effect [Re: Scorpion] #183446 02/18/08 08:18 02/18/08 08:18
Joined: Mar 2007 Posts: 677 0x00000USA M MrCode OP User
MrCode OP User M Joined: Mar 2007 Posts: 677 0x00000USA	Quote: a faster way to blur ist to blur h and v in diffrent passes How would I do this? I mean, how would I go about setting the values? Would I use a parametric trig function (x(t)= sin([pixel's x coord (t)] y(t)= sin([pixel's y coord (t)]) to get the values I need for the array(s)? Code: void main() { cout << "I am MrCode,"; cout << "hear me roar!"; system("PAUSE"); }

Re: Better blur effect [Re: MrCode] #183447
02/18/08 14:03 02/18/08 14:03

Joined: Jan 2007
Posts: 1,619
Germany

Scorpion

Serious User

Scorpion

Serious User

Joined: Jan 2007
Posts: 1,619
Germany

you are using pp! so you can use this two shaders (i wrote them for the bloom shader...)

Code:

MATERIAL* mtlBlurH =
{
	effect = "
		float4 vecViewPort;
		float4 vecSkill1;
		const int blurRadius = 5;//number of px

		Texture TargetMap;
		sampler2D smpSource = sampler_state{texture=<TargetMap>;};

		float4 BlurHPS(	float2 Tex:	TEXCOORD0):COLOR0
		{
			float4 Color = tex2D(smpSource,Tex.xy-vecViewPort.zw);
			float2 tempTex;
			tempTex.y = Tex.y;
			for(int i=-blurRadius;i<=blurRadius;i++)
			{
				tempTex.x = Tex.x+i*vecSkill1;
				Color += tex2D(smpSource,tempTex.xy-vecViewPort.zw);
			}
			return Color/(blurRadius*2+1);
		}
		
		technique Blackout { pass one { PixelShader = compile ps_2_0 BlurHPS();}}
		technique fallback { pass one { } }";
}

MATERIAL* mtlBlurV =
{
	effect = "
		float4 vecViewPort;
		float4 vecSkill1;
		const int blurRadius = 5;//number of px

		Texture TargetMap;
		sampler2D smpSource = sampler_state{texture=<TargetMap>;};

		float4 BlurVPS(	float2 Tex:	TEXCOORD0):COLOR0
		{
			float4 Color = tex2D(smpSource,Tex.xy-vecViewPort.zw);
			float2 tempTex;
			tempTex.x = Tex.x;
			for(int i=-blurRadius;i<=blurRadius;i++)
			{
				tempTex.y = Tex.y+i*vecSkill1.x;
				Color += tex2D(smpSource,tempTex.xy-vecViewPort.zw);
			}
			return Color/(blurRadius*2+1);
		}
		
		technique Blackout { pass one { PixelShader = compile ps_2_0 BlurVPS();}}
		technique fallback { pass one { } }";
}

Re: Better blur effect [Re: Scorpion] #183448 02/18/08 16:21 02/18/08 16:21
Joined: Jun 2004 Posts: 655 to your left BoH_Havoc User
BoH_Havoc User Joined: Jun 2004 Posts: 655 to your left	Before blurring you should also downsample the image to 1/4 of its original size. This way the shader is much faster and the result looks much more blurry. Shade-C EVO Lite-C Shader Framework

Re: Better blur effect [Re: BoH_Havoc] #183449 02/18/08 16:26 02/18/08 16:26
Joined: May 2005 Posts: 2,713 Lübeck Slin Expert
Slin Expert Joined: May 2005 Posts: 2,713 Lübeck	Quote: Before blurring you should also downsample the image to 1/4 of its original size. This way the shader is much faster and the result looks much more blurry. How do you do that? Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: Better blur effect [Re: Slin] #183450 02/18/08 16:33 02/18/08 16:33
Joined: Jun 2004 Posts: 655 to your left BoH_Havoc User
BoH_Havoc User Joined: Jun 2004 Posts: 655 to your left	just render the scene to a bmap 1/4 of the screenresolution. This could look like this for example: VIEW* s_view_blurRender = {bmap = "#256x192x32";} If you want to use this blurred image with other shaders (for example a Depth of Field shader), don't forget to rescale it to its original size. You can do that in the shader. This could look like this: float4 rescaledBlur = tex2D(blurMap,texcoord/4); [edit] heh, just noticed, i downsample by 1/16, not 1/4. sorry, my fault ^^ Last edited by BoH_Havoc; 02/18/08 16:35. Shade-C EVO Lite-C Shader Framework

Re: Better blur effect [Re: BoH_Havoc] #183451 02/18/08 16:36 02/18/08 16:36
Joined: May 2005 Posts: 2,713 Lübeck Slin Expert
Slin Expert Joined: May 2005 Posts: 2,713 Lübeck	o.O I always thought that it would just cut it out from the viewsize Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: Better blur effect [Re: Slin] #183452 02/18/08 16:48 02/18/08 16:48
Joined: Jun 2004 Posts: 655 to your left BoH_Havoc User
BoH_Havoc User Joined: Jun 2004 Posts: 655 to your left	Well, it works for me, so i can say it definately does not get cut Shade-C EVO Lite-C Shader Framework

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