removed superfluous overload

viewer/glow-extras/viewer/materials/ColorMapping.hh

@@ -79,10 +79,6 @@ public:
         range(min, max);
         return texture(glow::colors::colormap::linear(512, c0, c1).texture());
     }
-    ColorMapping& linear(tg::color3 c0 = {0, 0, 0}, tg::color3 c1 = {1, 1, 1}, float min = 0.0f, float max = 1.0f)
-    {
-        return linear(glow::colors::color(c0), glow::colors::color(c1), min, max);
-    }
 
     ColorMapping& clamped()
     {