diff --git a/libraries/render-utils/src/TextRenderer3D.cpp b/libraries/render-utils/src/TextRenderer3D.cpp
index 2f898542b9..5894a2a258 100644
--- a/libraries/render-utils/src/TextRenderer3D.cpp
+++ b/libraries/render-utils/src/TextRenderer3D.cpp
@@ -429,8 +429,8 @@ void Font3D::drawString(gpu::Batch& batch, float x, float y, const QString& str,
     setupGPU();
     batch.setPipeline(_pipeline);
     batch.setUniformTexture(_fontLoc, _texture);
-    batch._glUniform1f(_outlineLoc, (effectType == TextRenderer3D::OUTLINE_EFFECT) ? 1.0f : 0.0f);
     batch._glUniform4fv(_colorLoc, 1, (const GLfloat*)&color);
+    batch._glUniform1i(_outlineLoc, (effectType == TextRenderer3D::OUTLINE_EFFECT));
     
     batch.setInputFormat(_format);
     batch.setInputBuffer(0, _verticesBuffer, 0, _format->getChannels().at(0)._stride);
diff --git a/libraries/render-utils/src/sdf_text3D.slf b/libraries/render-utils/src/sdf_text3D.slf
index 3980045d08..07ca75237b 100644
--- a/libraries/render-utils/src/sdf_text3D.slf
+++ b/libraries/render-utils/src/sdf_text3D.slf
@@ -11,7 +11,7 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 
 uniform sampler2D Font;
-uniform float Outline;
+uniform bool Outline;
 uniform vec4 Color;
 
 const float gamma = 2.6;
@@ -22,7 +22,7 @@ const float outlineExpansion = 0.2;
 void main() {
     // retrieve signed distance
     float sdf = texture2D(Font, gl_TexCoord[0].xy).g;
-    if (Outline == 1.0f) {
+    if (Outline) {
         if (sdf > interiorCutoff) {
             sdf = 1.0 - sdf;
         } else {
@@ -31,7 +31,7 @@ void main() {
     }
     // perform adaptive anti-aliasing of the edges
     // The larger we're rendering, the less anti-aliasing we need
-    float s = smoothing * length(fwidth(gl_TexCoord[0]));
+    float s = smoothing * length(fwidth(gl_TexCoord[0].xy));
     float w = clamp( s, 0.0, 0.5);
     float a = smoothstep(0.5 - w, 0.5 + w, sdf);
     
@@ -43,5 +43,5 @@ void main() {
     }
 
     // final color
-    gl_FragColor = vec4(Color.rgb, a);
+    gl_FragColor = vec4(Color.rgb, Color.a * a);
 }
\ No newline at end of file