Spec shader

vec3 halfAngle = normalize(cameraDir + lightDir);
vec3 specularColor = min(lightColor[i] + 0.5, 1.0);
float specularDot = dot(normal, halfAngle);
specular += specularColor * pow(clamp(specularDot, 0.0, 1.0), 16.0) * distFactor;