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// Set the fragment color
uniform sampler2D tex;
varying vec3 fragmentNormal ;
varying vec3 lightVector ;
varying vec3 cameraVector ;
uniform float time ;
void main()
{
vec3 fragNormal = normalize( fragmentNormal ) ;
float f = dot( fragNormal, normalize( lightVector ) );
float c = dot( fragNormal, normalize( cameraVector ) );
c = (c - 0.5) * 2.0 ;
vec4 color = texture2D(tex,gl_TexCoord[0].xy + vec2( -time, -0.2 ));
float bluef2 = 0.0f;
float redf2 = 0.0f;
float greenf2 = 0.0f;
if( f > 0.0 ) {
bluef2 = (1.0f / (1.0f + exp(c * 20.0f))) * f;
redf2 = 200.0 * (1.0f / (1.0f + exp(c * 20.0f))) * pow(f,10.0) * f;
greenf2 = 200.0 * (1.0f / (1.0f + exp(c * 20.0f))) * pow(f,15.0) * f;
}
float alpha = (1.0f / (1.0f + exp(c * 30.0f))) * f;
/* Each color has its own drop off rate */
float bluef = (0.8f / (1.0f + exp(-f * 100.0f)));
float greenf = (0.8f / (1.0f + exp(-f * 40.0f))) ;
float redf = (0.8f / (1.0f + exp(-f * 20.0f))) ;
gl_FragColor = vec4(
min(1.0,(redf*color[0] + 1000.0*redf2)),
min(1.0,(greenf*color[1] + 1000.0*greenf2)),
min(1.0,(bluef*color[2] + 1000.0*bluef2)),
min(1.0,max(1.0-1000.0*alpha,0.0)) );
}
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