dynamic per pixel lighting

I have a huge optimized terrain (using a multitexture shader) with large faces that doesen't allow me to use vertex lghting for dynamic lights.
I'd be very glad if someone could post some code for using 3dgs dynamic lights as per pixel lights within my shader(hlsl).

Thanks!

i've once posted such a shader. you might search this forum.

Thanks...I found it here but it would take me ages to implement that in my existing shader...I might be able to find out the phone-number of that girl you met last saturday...but only if you help me to replace the vertex-lighting with your pp-lighting into the following shader-code
Code:

---

material mat_terr_hlsl_2 {

	flags = tangent;
	
	skin1 = terr_blendtex_red_2;
	skin2 = terr_blendtex_green_2;
	skin3 = terr_blendtex_blue_2;
	skin4 = terr_blendtex_black_2;

	event=init_mat_terr_hlsl;
	
	effect
	"
	/////////////////////////////////////////////////////////////////////////////////////////////
	// Define your needed values
	float4x4 matWorldViewProj;	 
	float4x4 matWorld;	
	float4x4 matWorldInv;	
	float4x4 matWorldView;
	
	float4 mtlSkill1;
	
	float4 vecSkill41;
	
	float4 vecSunDir;
	float4 vecFog;
	float4 vecLight;
	
	float4 vecLightPos[8];	 // preset this with light positions (xyz) and ranges (w)
	float4 vecLightColor[8]; // preset this with light colors
	float3 vecFalloff = float3(0.f, 0.f, 1.5f);
	float4 vecSunDiffuse = {1.0f, 1.0f, 0.8f, 1.0f};

	float sunStrength = 0.3f;


	// Define your textures
	texture mtlSkin1;					
	texture mtlSkin2;					
	texture mtlSkin3;
	texture mtlSkin4;
	
	texture entSkin1;
	texture entSkin2;	
	texture entSkin3;					
	texture entSkin4;
	
	/////////////////////////////////////////////////////////////////////////////////////////////
	// Texture settings
	
	
	sampler sTex1 = sampler_state			
	{
		Texture = <entSkin1>;   // rgb-blendmap
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex2 = sampler_state			
	{
		Texture = <entSkin2>;   // shadowmap
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex3 = sampler_state			
	{
		Texture = <entSkin3>;	// causticsA
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex4= sampler_state			
	{
		Texture = <entSkin4>;	// causticsB
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	

	sampler sTex5 = sampler_state			
	{
		Texture = <mtlSkin1>;	// red
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex6 = sampler_state			
	{
		Texture = <mtlSkin2>;	// green
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex7 = sampler_state			
	{
		Texture = <mtlSkin3>;	// blue
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex8 = sampler_state			
	{
		Texture = <mtlSkin4>;	// black
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	
	//////////////////////////////////////////////////////////////////////
	// return the sun light on the surface
	float4 DoSunLight(float3 N)
	{
		// modulate the sunlight by the surface angle
		return vecSunDiffuse * dot(N,-vecSunDir);
	}

	// return the dynamic light on the surface
	float4 DoPointLight(float3 P, float3 N, int i)
	{
		// calculate the light ray pointing from the light to the surface
		float3 D = vecLightPos[i].xyz - P;
		// calculate the angle between surface and light ray
		float NdotL = dot(N, normalize(D));
		// modulate the light by the surface angle
		float4 Color = vecLightColor[i] * NdotL;

		// calculate the light attenuation factor, DX uses a really strange formula here
		float fac = 0.f;
		if (NdotL >= 0.f && vecLightPos[i].w > 0.f)
		{
			// get the distance factor
			float LD = length(D)/vecLightPos[i].w;
			#ifdef DXLIGHTING
				if (LD < 1.3f)
				fac = 1.f/(vecFalloff.x + vecFalloff.y*LD + vecFalloff.z*LD*LD);
				#else  // linear Lighting
				if (LD < 1.f)
				fac = 1.f - LD;
			#endif
		}
		return Color * fac;
	}


	float DoFog(float4 Pos)
	{
		// convert the vector position to view space to get it's depth (.z)
		float3 P = mul(Pos,matWorldView);
		// apply the linear fog formula
		return saturate((vecFog.y-P.z) * vecFog.z);
	}
	
	
	struct TMULTI_VS_OUT // Output to the pixelshader fragment
	{
		float4 Pos 		: POSITION;
		float  Fog		: FOG;
		
		float4 tColor	: COLOR0;
		
		float2 Tex1 	: TEXCOORD0;
		float2 Tex2 	: TEXCOORD1;
		
		float2 Tex3 	: TEXCOORD2;
		float2 Tex4		: TEXCOORD3;
		
		float2 Tex5		: TEXCOORD4;
		float2 Tex6		: TEXCOORD5;	
		float2 Tex7		: TEXCOORD6;
		float2 Tex8		: TEXCOORD7;
	};
	
	TMULTI_VS_OUT TMulti_VS(
	float4 inPos : POSITION,
	float3 inNormal : NORMAL,
	float2 inTexCoord0 : TEXCOORD0)
	{
		
		TMULTI_VS_OUT Out;
		
		// transform the vector position to screen coordinates
		Out.Pos = mul(inPos, matWorldViewProj);
		float3 N = normalize(mul(inNormal, matWorldInv));
		float3 P = mul(inPos, matWorld);
		
		// Add ambient and sun light
		Out.tColor = ((DoSunLight(N) - 0.5f)*sunStrength)+0.7;
		
		// Add 8 dynamic lights (maximum for vs 1.1)
		for (int i=0; i<6; i++)
		Out.tColor += DoPointLight(P,N,i);
		
		// Add fog
		Out.Fog = DoFog(inPos);
		
		// scale the texture coordinates for the masked textures
		Out.Tex1  = inTexCoord0.xy;		// rgb-blendmap (not tiled)
		Out.Tex2  = inTexCoord0.xy;		// shadowmap    (not tiled)
		
		Out.Tex3 = (inTexCoord0.xy*vecSkill41.w+vecSkill41.w/50)+0.1* vecSkill41.xy;//sin(vecSkill41);//moving the caustics texture	
		Out.Tex4 = (inTexCoord0.xy*vecSkill41.w)-0.1* vecSkill41.y;//moving the caustics texture
		
		Out.Tex5  = inTexCoord0.xy*40;	// tiling texture red
		Out.Tex6  = inTexCoord0.xy*60;	// tiling texture green
		Out.Tex7  = inTexCoord0.xy*20;	// tiling texture blue
		Out.Tex8  = inTexCoord0.xy*40;	// tiling texture black
		
		
		
		return Out;
	}
	
	
	//////////////////////////////////////////////////////////////////////////////////////////////////////
	// pixelshader
	float4 ps( TMULTI_VS_OUT In ) : COLOR
	{
		float4 BlendColor = tex2D(sTex1,In.Tex1);
		float4 ShadowMap = tex2D(sTex2,In.Tex2);
		
		float4 causticsA = tex2D(sTex3,In.Tex3);
		float4 causticsB = tex2D(sTex4,In.Tex4);
		
		float4 RedColor = tex2D(sTex5,In.Tex5);
		float4 GreenColor = tex2D(sTex6,In.Tex6);
		float4 BlueColor = tex2D(sTex7,In.Tex7);
		float4 BlackColor = tex2D(sTex8,In.Tex8);
		
		
		float4 BaseRed = lerp(BlackColor,RedColor,BlendColor.r);
		float4 BaseGreen = lerp(BaseRed,GreenColor,BlendColor.g);
		
		
		float4 FinalColor = lerp(BaseGreen,BlueColor,BlendColor.b);
		
		
		float4 BaseCaustics = lerp(FinalColor,(FinalColor*(causticsA+causticsB)),ShadowMap.a);
		
		//////////////////////////////////////////////////////////////////////////////////////////////			
		
		
		FinalColor = In.tColor*(ShadowMap*1.5)*BaseCaustics;
		
		FinalColor = (FinalColor)*(mtlSkill1);
		
		FinalColor.a = 1.0f; // prevent transparency
		
		return FinalColor;
	}
	
	//////////////////////////////////////////////////////////////////////////////////////////////////////
	// 
	technique mytechnique
	{
		// Define your passes
		pass p0
		{
			VertexShader = compile vs_2_0 TMulti_VS();
			PixelShader = compile ps_2_0 ps();
		}
	}
	
technique fallback{pass p0{}}
	
	";
}

---

how can you know... last saturday... i thought nobody saw us

well, i'll have a look into it if i've some spare time left.

greetings, joey

hehe...thanks I'll start with the phone number investigation right now

okay, i included my snippets... the code isn't very optimized, though, and i'm not quite sure it'll work. i haven't tested it. i've compressed your use of texture coordinates since i was in need of 2, too.

Code:

---

material mat_terr_hlsl_2 {

	flags = tangent;
	
	skin1 = terr_blendtex_red_2;
	skin2 = terr_blendtex_green_2;
	skin3 = terr_blendtex_blue_2;
	skin4 = terr_blendtex_black_2;

	event=init_mat_terr_hlsl;
	
	effect
	"
	/////////////////////////////////////////////////////////////////////////////////////////////
	// Define your needed values
	float4x4 matWorldViewProj;	 
	float4x4 matWorld;	
	float4x4 matWorldInv;	
	float4x4 matWorldView;
	
	float4 mtlSkill1;
	
	float4 vecSkill41;
	
	float4 vecSunDir;
	float4 vecFog;
	float4 vecLight;
	
	float4 vecLightPos[8];	 // preset this with light positions (xyz) and ranges (w)
	float4 vecLightColor[8]; // preset this with light colors
	float3 vecFalloff = float3(0.f, 0.f, 1.5f);
	float4 vecSunDiffuse = {1.0f, 1.0f, 0.8f, 1.0f};

	float sunStrength = 0.3f;


	// Define your textures
	texture mtlSkin1;					
	texture mtlSkin2;					
	texture mtlSkin3;
	texture mtlSkin4;
	
	texture entSkin1;
	texture entSkin2;	
	texture entSkin3;					
	texture entSkin4;
	
	/////////////////////////////////////////////////////////////////////////////////////////////
	// Texture settings
	
	
	sampler sTex1 = sampler_state			
	{
		Texture = <entSkin1>;   // rgb-blendmap
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex2 = sampler_state			
	{
		Texture = <entSkin2>;   // shadowmap
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex3 = sampler_state			
	{
		Texture = <entSkin3>;	// causticsA
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex4= sampler_state			
	{
		Texture = <entSkin4>;	// causticsB
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	

	sampler sTex5 = sampler_state			
	{
		Texture = <mtlSkin1>;	// red
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex6 = sampler_state			
	{
		Texture = <mtlSkin2>;	// green
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex7 = sampler_state			
	{
		Texture = <mtlSkin3>;	// blue
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	sampler sTex8 = sampler_state			
	{
		Texture = <mtlSkin4>;	// black
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU = Wrap;	
		AddressV = Wrap;
	};
	
	//////////////////////////////////////////////////////////////////////
	// return the sun light on the surface
	float4 DoSunLight(float3 N)
	{
		// modulate the sunlight by the surface angle
		return vecSunDiffuse * dot(N,-vecSunDir);
	}
	
	float4 ppLightCalc(float4 Color, float3 Position, float3 Normal, int i)
	{
		// direction towards light
		float3 vecLight = vecLightPos[i].xyz - Position.xyz;
		float3 dirLight = normalize(vecLight);
		
		// diffuse lighting factor
		float fDiff = clamp(dot(dirLight, Normal), 0, 1);
		
		// direction towards view
		float3 dirView = normalize(vecViewPos.xyz - Position.xyz);
		
		// reflection vector for light
		float3 reflection = reflect(-dirLight, Normal);

		// specular lighting factor
		float fSpec = pow(clamp(dot(reflection, dirView), 0, 1), 16);
		
		// light color
		float3 light = vecLightColor[i].rgb;
		
		// attenuation
		float attenuation = pow(clamp(1.0f - length(vecLight/vecLightPos[i].z), 0, 1), 0.5);
		
		return float4(light*(fDiff*Color + fSpec)*attenuation, 1);
	}

	float DoFog(float4 Pos)
	{
		// convert the vector position to view space to get it's depth (.z)
		float3 P = mul(Pos,matWorldView);
		// apply the linear fog formula
		return saturate((vecFog.y-P.z) * vecFog.z);
	}
	
	
	struct TMULTI_VS_OUT // Output to the pixelshader fragment
	{
		float4 Pos 		: POSITION;
		float  Fog		: FOG;
		
		float4 Light	: COLOR0;
		
		float4 Tex12 	: TEXCOORD0;
		float4 Tex34 	: TEXCOORD1;
		
		float4 Tex56 	: TEXCOORD2;
		float4 Tex78	: TEXCOORD3;
		
		float3 WPos		: TEXCOORD4;
		float3 WNormal	: TEXCOORD5;
	};
	
	TMULTI_VS_OUT TMulti_VS(
	float4 inPos : POSITION,
	float3 inNormal : NORMAL,
	float2 inTexCoord0 : TEXCOORD0)
	{
		
		TMULTI_VS_OUT Out;
		
		// transform the vector position to screen coordinates
		Out.Pos = mul(inPos, matWorldViewProj);
		
		// scale the texture coordinates for the masked textures
		Out.Tex12  = float4(inTexCoord0.xy, inTexCoord0.xy);		// rgb-blendmap (not tiled) and shadowmap
		
		Out.Tex34 = float4((inTexCoord0.xy*vecSkill41.w+vecSkill41.w/50)+0.1* vecSkill41.xy,;//sin(vecSkill41);//moving the caustics texture	
						   (inTexCoord0.xy*vecSkill41.w)-0.1* vecSkill41.y);//moving the caustics texture
		
		Out.Tex56  = float4(inTexCoord0.xy*40, inTexCoord0.xy*60);	// tiling texture red, green
		Out.Tex78  = float4(inTexCoord0.xy*20, inTexCoord0.xy*40);	// tiling texture blue, black
		
		// normal, position for lighting
		Out.WNormal = normalize(mul(inNormal, matWorldInv)).xyz;
		Out.WPos = mul(inPos, matWorld).xyz;
		
		// Add ambient and sun light
		Out.Light = ((DoSunLight(N) - 0.5f)*sunStrength)+0.7;
		
		// Add fog
		Out.Fog = DoFog(inPos);
		
		return Out;
	}
	
	
	//////////////////////////////////////////////////////////////////////////////////////////////////////
	// pixelshader
	float4 ps( TMULTI_VS_OUT In ) : COLOR
	{
		float4 BlendColor = tex2D(sTex1,In.Tex12.xy);
		float4 ShadowMap = tex2D(sTex2,In.Tex12.zw);
		
		float4 causticsA = tex2D(sTex3,In.Tex34.xy);
		float4 causticsB = tex2D(sTex4,In.Tex34.zw);
		
		float4 RedColor = tex2D(sTex5,In.Tex56.xy);
		float4 GreenColor = tex2D(sTex6,In.Tex56.zw);
		float4 BlueColor = tex2D(sTex7,In.Tex78.xy);
		float4 BlackColor = tex2D(sTex8,In.Tex78.zw);
		
		
		float4 BaseRed = lerp(BlackColor,RedColor,BlendColor.r);
		float4 BaseGreen = lerp(BaseRed,GreenColor,BlendColor.g);
		
		
		float4 FinalColor = lerp(BaseGreen,BlueColor,BlendColor.b);
		
		
		float4 BaseCaustics = lerp(FinalColor,(FinalColor*(causticsA+causticsB)),ShadowMap.a);
		
		//////////////////////////////////////////////////////////////////////////////////////////////			
		
		FinalColor = In.Light*(ShadowMap*1.5)*BaseCaustics;
		
		FinalColor = (FinalColor)*(mtlSkill1);
		
		int i;
		float3 lighting = float3(0, 0, 0);
		for (i = 0; i < 8; i ++) {
			lighting += ppLightCalc(FinalColor, In.WPos, In.WNormal, i);
		}
		
		FinalColor += lighting;
		FinalColor.a = 1.0f; // prevent transparency
		
		return FinalColor;
	}
	
	//////////////////////////////////////////////////////////////////////////////////////////////////////
	// 
	technique mytechnique
	{
		// Define your passes
		pass p0
		{
			VertexShader = compile vs_2_0 TMulti_VS();
			PixelShader = compile ps_2_0 ps();
		}
	}
	
technique fallback{pass p0{}}
	
	";
}

---

if you get some errors, just post them. you might be able to solve them by yourself, it's not that complicated code at all.

uum... any progress in her phone number?

joey

Big thanks...I'll try it asap!

hmm...I think I saw that girl fooling around with some other guy...let's just drop it

ok..I have an error message "cannot implicitly convert (const float3) to float4"...and it points to that part of the code
Code:

---

...

float3 lighting = float3(0, 0, 0);
for (i = 0; i < 8; i ++) {
lighting += ppLightCalc(FinalColor, In.WPos, In.WNormal, i);

...
}
		
FinalColor += lighting;  

---

any hints?

just change the float3 lighting... by float4.

hmm...I already tried that but it doesen't change anything

...

float4 lighting = float4(0, 0, 0);
for (i = 0; i < 8; i ++) {
lighting += ppLightCalc(FinalColor, In.WPos, In.WNormal, i);

...
}

FinalColor += lighting;