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DarkBASIC Professional Discussion / Add fog in a shader

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Hell_666

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Joined: 11th Jul 2009

Location: France

Posted: 14th Aug 2012 13:10

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Hi, I've a MapScape map with fog (in the shader) but the problem is I use the fastbone shader for all my AI and so they are not fogged.

I've tried to add fog in the fastbone shader with the mapscape shader but it doesn't work.

Is someone know how implement fog in a shader or is there a fastbone shader with fog ?

Thanks.

Eternal suffering ...

I'm french

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pdq

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Joined: 20th Jul 2006

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Posted: 21st Sep 2012 01:42

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Here are the important code lines I used to specifically handle fog.

Global declarations:

+ Code Snippet

float3 CameraPosition : CameraPosition; 
float fogNear = 100; 
float fogFar = 1000; 
float4 fogColor = {1.0, 1.0, 1.0, 1.0};

Vertex Shader output struct:

+ Code Snippet

float3 wpos : TEXCOORD5;

Vertex Shader:

+ Code Snippet

float3 WPos=mul(IN.Pos,World);
OUT.wpos = WPos;

Pixel Shader:

+ Code Snippet


float4 color = (diff*Att) +(GlobalSpec*spec*Att) + amb;
float d = length(IN.wpos - CameraPosition); 
float l = saturate((d - fogNear) / (fogFar - fogNear));
color = lerp(color, fogColor, l);

Hope this jump starts you.

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DarkBASIC Professional Discussion / Add fog in a shader