diff --git a/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc b/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
index 47dadff5c895a..3e4acc30f7e05 100644
--- a/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
+++ b/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
@@ -226,14 +226,13 @@ std::optional<Snapshot> DirectionalGaussianBlurFilterContents::RenderFilter(
   };
 
   Vector2 scale;
+  auto scale_curve = [](Scalar radius) { return std::min(1.0, 2.0 / radius); };
   {
-    scale.x =
-        1.0 /
-        std::ceil(std::log2(std::max(2.0f, transformed_blur_radius_length)));
+    scale.x = scale_curve(transformed_blur_radius_length);
 
     Scalar y_radius = std::abs(pass_transform.GetDirectionScale(Vector2(
         0, source_override_ ? Radius{secondary_blur_sigma_}.radius : 1)));
-    scale.y = 1.0 / std::ceil(std::log2(std::max(2.0f, y_radius)));
+    scale.y = scale_curve(y_radius);
   }
 
   Vector2 scaled_size = pass_texture_rect.size * scale;
diff --git a/impeller/geometry/geometry_unittests.cc b/impeller/geometry/geometry_unittests.cc
index 0957acf76b23a..c1c92f37e500f 100644
--- a/impeller/geometry/geometry_unittests.cc
+++ b/impeller/geometry/geometry_unittests.cc
@@ -229,7 +229,7 @@ TEST(GeometryTest, MatrixTransformDirection) {
   }
 
   {
-    auto matrix = Matrix::MakeTranslation({100, 100, 100}) *
+    auto matrix = Matrix::MakeTranslation({0, -0.4, 100}) *
                   Matrix::MakeRotationZ(Radians{kPiOver2}) *
                   Matrix::MakeScale({2.0, 2.0, 2.0});
     auto vector = Point(10, 20);
diff --git a/impeller/geometry/matrix.h b/impeller/geometry/matrix.h
index 29bbb949b3918..9be6707f08503 100644
--- a/impeller/geometry/matrix.h
+++ b/impeller/geometry/matrix.h
@@ -249,7 +249,7 @@ struct Matrix {
   }
 
   constexpr Scalar GetDirectionScale(Vector3 direction) const {
-    return 1.0 / (this->Invert() * direction.Normalize()).Length() *
+    return 1.0 / (this->Basis().Invert() * direction.Normalize()).Length() *
            direction.Length();
   }