diff --git a/rend3-test/src/helpers.rs b/rend3-test/src/helpers.rs
index c9271366..59dad809 100644
--- a/rend3-test/src/helpers.rs
+++ b/rend3-test/src/helpers.rs
@@ -62,7 +62,7 @@ impl TestRunner {
             ],
             rend3::types::Handedness::Left,
         )
-        .with_indices(vec![0, 1, 2, 0, 2, 3])
+        .with_indices(vec![0, 2, 1, 0, 3, 2])
         .build()
         .unwrap();
 
diff --git a/rend3-test/src/runner.rs b/rend3-test/src/runner.rs
index 7b0344e6..e25a4eff 100644
--- a/rend3-test/src/runner.rs
+++ b/rend3-test/src/runner.rs
@@ -16,6 +16,7 @@ use wgpu::{
 
 use crate::{helpers::CaptureDropGuard, ThresholdSet};
 
+#[derive(Clone)]
 pub struct FrameRenderSettings {
     size: u32,
     samples: SampleCount,
@@ -129,14 +130,7 @@ impl TestRunner {
         TestRunnerBuilder::new()
     }
 
-    pub async fn render_frame(&self, settings: FrameRenderSettings) -> Result<image::RgbaImage> {
-        let buffer = self.renderer.device.create_buffer(&wgpu::BufferDescriptor {
-            label: Some("Test output buffer"),
-            size: (settings.size * settings.size * 4) as u64,
-            usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::MAP_READ,
-            mapped_at_creation: false,
-        });
-
+    pub fn process_events(&self, settings: FrameRenderSettings) -> wgpu::Texture {
         let texture = self.renderer.device.create_texture(&TextureDescriptor {
             label: Some("Test output image"),
             size: Extent3d {
@@ -179,6 +173,19 @@ impl TestRunner {
 
         graph.execute(&self.renderer, &mut eval_output);
 
+        texture
+    }
+
+    pub async fn render_frame(&self, settings: FrameRenderSettings) -> Result<image::RgbaImage> {
+        let buffer = self.renderer.device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Test output buffer"),
+            size: (settings.size * settings.size * 4) as u64,
+            usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::MAP_READ,
+            mapped_at_creation: false,
+        });
+
+        let texture = self.process_events(settings.clone());
+
         let mut encoder = self
             .renderer
             .device
diff --git a/rend3-test/tests/msaa.rs b/rend3-test/tests/msaa.rs
index 6ccc550d..f92c7241 100644
--- a/rend3-test/tests/msaa.rs
+++ b/rend3-test/tests/msaa.rs
@@ -48,3 +48,48 @@ pub async fn triangle() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+#[test_attr]
+pub async fn sample_coverage() -> anyhow::Result<()> {
+    let iad = no_gpu_return!(rend3::create_iad(None, None, None, None).await)
+        .context("InstanceAdapterDevice creation failed")?;
+
+    let Ok(runner) = TestRunner::builder().iad(iad.clone()).handedness(Handedness::Left).build().await else {
+        return Ok(());
+    };
+
+    let material = runner.add_unlit_material(Vec4::ONE);
+
+    // Make a plane whose (0, 0) is at the top left, and is 1 unit large.
+    let base_matrix = Mat4::from_translation(Vec3::new(0.5, 0.5, 0.0)) * Mat4::from_scale(Vec3::new(0.5, 0.5, 1.0));
+    // 64 x 64 grid of planes
+    let mut planes = Vec::with_capacity(64 * 64);
+    for x in 0..64 {
+        for y in 0..64 {
+            planes.push(runner.plane(
+                material.clone(),
+                Mat4::from_translation(Vec3::new(x as f32, y as f32, 0.0))
+                    * Mat4::from_scale(Vec3::new(1.0 - (x as f32 / 63.0), 1.0 - (y as f32 / 63.0), 1.0))
+                    * base_matrix,
+            ));
+        }
+        runner.process_events(FrameRenderSettings::new());
+    }
+
+    runner.set_camera_data(Camera {
+        projection: rend3::types::CameraProjection::Raw(Mat4::orthographic_lh(0.0, 64.0, 64.0, 0.0, 0.0, 1.0)),
+        view: Mat4::IDENTITY,
+    });
+
+    for samples in SampleCount::ARRAY {
+        runner
+            .render_and_compare(
+                FrameRenderSettings::new().samples(samples),
+                &format!("tests/results/msaa/sample-coverage-{}.png", samples as u8),
+                0.0,
+            )
+            .await?;
+    }
+
+    Ok(())
+}
diff --git a/rend3-test/tests/results/msaa/sample-coverage-1.png b/rend3-test/tests/results/msaa/sample-coverage-1.png
new file mode 100644
index 00000000..6fd080b0
Binary files /dev/null and b/rend3-test/tests/results/msaa/sample-coverage-1.png differ
diff --git a/rend3-test/tests/results/msaa/sample-coverage-4.png b/rend3-test/tests/results/msaa/sample-coverage-4.png
new file mode 100644
index 00000000..4db6a56d
Binary files /dev/null and b/rend3-test/tests/results/msaa/sample-coverage-4.png differ
diff --git a/rend3-test/tests/shadow.rs b/rend3-test/tests/shadow.rs
index 88d1b478..b12f93c7 100644
--- a/rend3-test/tests/shadow.rs
+++ b/rend3-test/tests/shadow.rs
@@ -18,7 +18,7 @@ pub async fn shadows() -> anyhow::Result<()> {
 
     let material1 = runner.add_lit_material(Vec4::new(0.25, 0.5, 0.75, 1.0));
 
-    let _plane = runner.plane(material1, Mat4::from_rotation_x(FRAC_PI_2));
+    let _plane = runner.plane(material1, Mat4::from_rotation_x(-FRAC_PI_2));
 
     runner.set_camera_data(Camera {
         projection: rend3::types::CameraProjection::Orthographic {
diff --git a/rend3-types/src/lib.rs b/rend3-types/src/lib.rs
index b47f3b60..abce0ed3 100644
--- a/rend3-types/src/lib.rs
+++ b/rend3-types/src/lib.rs
@@ -1167,6 +1167,8 @@ impl TryFrom<u8> for SampleCount {
 }
 
 impl SampleCount {
+    pub const ARRAY: [Self; 2] = [Self::One, Self::Four];
+
     /// Determines if a resolve texture is needed for this texture.
     pub fn needs_resolve(self) -> bool {
         self != Self::One