+ specular = c;
+}
+
+void Light::set_matrix(const Matrix &m)
+{
+ Placeable::set_matrix(m);
+ position = matrix.column(3);
+ spot_dir = normalize(-matrix.column(2).slice<3>(0));
+ direction = (position.w ? spot_dir : normalize(-position.slice<3>(0)));
+ update_matrix();
+}
+
+void Light::set_position(const Vector4 &p)
+{
+ position = p;
+ if(!position.w)
+ direction = normalize(-position.slice<3>(0));
+ update_matrix();
+}
+
+void Light::set_spot_direction(const Vector3 &d)
+{
+ spot_dir = normalize(d);
+ if(position.w)
+ direction = spot_dir;
+ update_matrix();
+}
+
+void Light::set_spot_exponent(float e)
+{
+ if(e<0)
+ throw invalid_argument("Light::set_spot_exponent");
+
+ spot_exp = e;
+}
+
+void Light::set_spot_cutoff(const Geometry::Angle<float> &c)
+{
+ if(c<Geometry::Angle<float>::zero() || (c>Geometry::Angle<float>::right() && c!=Geometry::Angle<float>::straight()))
+ throw invalid_argument("Light::set_spot_cutoff");
+
+ spot_cutoff = c;
+}
+
+void Light::disable_spot_cutoff()
+{
+ set_spot_cutoff(Geometry::Angle<float>::straight());
+}
+
+void Light::set_attenuation(float c, float l, float q)
+{
+ attenuation[0] = c;
+ attenuation[1] = l;
+ attenuation[2] = q;