diff --git a/data/ofxMsdfgen/shaders/unitRange/ES3/shader.frag b/data/ofxMsdfgen/shaders/unitRange/ES3/shader.frag
index fe58357..068261a 100644
--- a/data/ofxMsdfgen/shaders/unitRange/ES3/shader.frag
+++ b/data/ofxMsdfgen/shaders/unitRange/ES3/shader.frag
@@ -5,7 +5,7 @@ precision highp float;
 uniform sampler2D msdf;
 
 uniform vec4 fontColor;
-uniform float unitRange;
+uniform vec2 unitRange;
 
 // this comes from the vertex shader
 in vec2 texCoordVarying;
@@ -31,5 +31,7 @@ void main()
     float sd = median(msdf_rgb.r, msdf_rgb.g, msdf_rgb.b);
     float screenPxDistance = screenPxRange()*(sd - 0.5);
     float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
+
     outputColor = mix(bgColor, fgColor, opacity);
+    //outputColor = vec4(opacity, 1.0-opacity, 0.0, 1.0);
 }
diff --git a/data/ofxMsdfgen/shaders/unitRange/GL3/shader.frag b/data/ofxMsdfgen/shaders/unitRange/GL3/shader.frag
index e4032fd..fb9188d 100644
--- a/data/ofxMsdfgen/shaders/unitRange/GL3/shader.frag
+++ b/data/ofxMsdfgen/shaders/unitRange/GL3/shader.frag
@@ -5,7 +5,7 @@ precision highp float;
 uniform sampler2DRect msdf;
 
 uniform vec4 fontColor;
-uniform float unitRange;
+uniform vec2 unitRange;
 
 // this comes from the vertex shader
 in vec2 texCoordVarying;