diff --git a/filament/src/materials/blur.mat b/filament/src/materials/blur.mat
index 32f7302b5e..6b6b066414 100644
--- a/filament/src/materials/blur.mat
+++ b/filament/src/materials/blur.mat
@@ -39,11 +39,11 @@ vertex {
 }
 
 fragment {
-    const int kGaussianCount = 5;
+    const int kGaussianCount = 8;
     const float kGaussianSamples[] = float[](
-        0.239365, 0.199935, 0.116512, 0.047370, 0.013437
+        0.149603, 0.139446, 0.112927, 0.079454, 0.048569, 0.025795, 0.011902, 0.004772
     );
-    const float kGaussianWeightSum = 0.993872;
+    const float kGaussianWeightSum = 0.995331;
 
     ivec2 clampToEdge(const sampler2D s, ivec2 uv) {
         ivec2 size = textureSize(s, 0);
@@ -78,7 +78,7 @@ fragment {
     }
 
     void postProcess(inout PostProcessInputs postProcess) {
-        ivec2 uv = ivec2(variable_vertex.xy * materialParams.resolution.xy);
+        highp ivec2 uv = ivec2(variable_vertex.xy * materialParams.resolution.xy);
 
         float depth = texelFetch(materialParams_depth, uv, 0).r;
 
diff --git a/filament/src/materials/sao.mat b/filament/src/materials/sao.mat
index 1961eea353..38edc5a0b0 100644
--- a/filament/src/materials/sao.mat
+++ b/filament/src/materials/sao.mat
@@ -210,7 +210,8 @@ fragment {
         return clamp(uv, ivec2(0), size - ivec2(1));
     }
 
-    float computeAmbientOcclusionSAO(uint i, float ssDiskRadius, const ivec2 ssOrigin,
+    void computeAmbientOcclusionSAO(inout float occlusion,
+            uint i, float ssDiskRadius, const ivec2 ssOrigin,
             const highp vec3 origin, const vec3 normal, const vec3 noise) {
 
         vec3 tap = tapLocation(i, noise);
@@ -230,13 +231,12 @@ fragment {
         float vv = dot(v, v);       // squared distance
         float vn = dot(v, normal);  // distance * cos(v, normal)
         const float uu = 0.015;
-        float falloff = saturate(1.0 - vv * materialParams.invRadiusSquared);
-        float occlusion = falloff * max(0.0, vn + origin.z * materialParams.bias) / (vv + uu);
-        return occlusion;
+        float w = saturate(1.0 - vv * materialParams.invRadiusSquared);
+        occlusion += w * max(0.0, vn + origin.z * materialParams.bias) / (vv + uu);
     }
 
     void postProcess(inout PostProcessInputs postProcess) {
-        vec2 uv = variable_vertex.xy; // interpolated to pixel center
+        highp vec2 uv = variable_vertex.xy; // interpolated to pixel center
 
         highp float depth = sampleDepthLinear(uv);
         highp vec3 origin = computeViewSpacePositionFromDepth(uv, depth);
@@ -252,7 +252,7 @@ fragment {
 
         float occlusion = 0.0;
         for (uint i = 0u; i < kSpiralSampleCount; i++) {
-            occlusion += computeAmbientOcclusionSAO(i, ssDiskRadius, ssOrigin, origin, normal, noise);
+            computeAmbientOcclusionSAO(occlusion, i, ssDiskRadius, ssOrigin, origin, normal, noise);
         }
 
         float ao = max(0.0, 1.0 - (2.0 / float(kSpiralSampleCount)) * materialParams.intensity * occlusion);
diff --git a/filament/tools/ssaogen.cpp b/filament/tools/ssaogen.cpp
index bb96cf9736..8018417280 100644
--- a/filament/tools/ssaogen.cpp
+++ b/filament/tools/ssaogen.cpp
@@ -222,7 +222,7 @@ int main(int argc, char** argv) {
 
 
     float weightSum = 0;
-    size_t gaussianWidth = 9;   // must be odd
+    size_t gaussianWidth = 15;   // must be odd
     const size_t gaussianSampleCount = (gaussianWidth + 1) / 2;
     std::cout << "const int kGaussianCount = " << gaussianSampleCount << ";" << std::endl;
     std::cout << "const int kRadius = kGaussianCount - 1;" << std::endl;
@@ -241,7 +241,7 @@ int main(int argc, char** argv) {
         // Cut-off frequency definition:
         //      fc = 1.1774 / (2pi * q)       (half power frequency or 0.707 amplitude)
 
-        float q = (gaussianWidth + 1.0f) / 6.0f;  // ~1.667 for 9 taps
+        float q = (gaussianWidth + 1.0f) / 6.0f;  // ~2.667 for 15 taps
         float g = float((1.0 / (std::sqrt(2.0 * F_PI) * q)) * std::exp(-(x * x) / (2.0 * q * q)));
         weightSum += g * (i == 0 ? 1.0f : 2.0f);