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#version 330
in vec3 Position;
in vec3 Normal;
out vec4 color;
uniform vec3 lightPosition;
uniform vec4 Ia, Id, Is;
uniform vec4 ka, kd, ks;
uniform float s;
uniform sampler2D diffuseRamp;
uniform sampler2D specularRamp;
void main() {
vec3 l = normalize(lightPosition.xyz - Position);
vec3 n = normalize(Normal);
vec3 e = normalize(-Position);
vec3 h = normalize(e + l);
float diffuse = (dot(l,n) + 1)/2;
float specular = pow(max(dot(n,h),0), s);
color = ka*Ia
+ kd*Id*texture(diffuseRamp, vec2(diffuse,0))
+ ks*Is*texture(specularRamp, vec2(specular,0));
color.a = 1;
}
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