diff --git a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Bubbles/Bubbles.shader b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Bubbles/Bubbles.shader
index 83d28303..2646b520 100644
--- a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Bubbles/Bubbles.shader
+++ b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Bubbles/Bubbles.shader
@@ -87,8 +87,8 @@ Category {
         float4 center = SpreadParticle(v, spreadProgress);
 
         float3 displacement_SS = spreadProgress * computeDisplacement(center, 1);
-        float3 displacement_WS = mul(xf_CS, displacement_SS);
-        float3 displacement_OS = mul(unity_WorldToObject, displacement_WS);
+        float3 displacement_WS = mul(xf_CS, float4(displacement_SS, 0));
+        float3 displacement_OS = mul(unity_WorldToObject, float4(displacement_WS, 0));
         center.xyz += displacement_OS;
         float4 corner = OrientParticle(center.xyz, halfSize, v.vid, rotation);
         o.vertex = UnityObjectToClipPos(corner);
diff --git a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Embers/Embers.shader b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Embers/Embers.shader
index e5d1edb1..56ec29bf 100644
--- a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Embers/Embers.shader
+++ b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Embers/Embers.shader
@@ -121,7 +121,7 @@ Category {
         // The problem with this is that if you scale up a layer, the particles
         // get big but the overall motion stays the same.
         float4 center_WS = mul(unity_ObjectToWorld, center);
-        center_WS.xyz += mul(xf_CS, disp);
+        center_WS.xyz += mul(xf_CS, float4(disp, 0));
         float4 corner_WS = OrientParticle_WS(center_WS.xyz, halfSize, v.vid, rotation);
         o.vertex = mul(UNITY_MATRIX_VP, corner_WS);
 #else
diff --git a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Fire/Fire.shader b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Fire/Fire.shader
index 16b076c3..1432ed1c 100644
--- a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Fire/Fire.shader
+++ b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Fire/Fire.shader
@@ -48,14 +48,22 @@ Category {
         float4 vertex : POSITION;
         fixed4 color : COLOR;
         float3 normal : NORMAL;
+#if SHADER_TARGET >= 40
         centroid float2 texcoord : TEXCOORD0;
+#else
+        float2 texcoord : TEXCOORD0;
+#endif
         float3 worldPos : TEXCOORD1;
       };
 
       struct v2f {
         float4 vertex : POSITION;
         float4 color : COLOR;
+#if SHADER_TARGET >= 40
         centroid float2 texcoord : TEXCOORD0;
+#else
+        float2 texcoord : TEXCOORD0;
+#endif
         float3 worldPos : TEXCOORD1;
       };
 
diff --git a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Smoke/Smoke.shader b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Smoke/Smoke.shader
index d65935e9..07abbdc2 100644
--- a/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Smoke/Smoke.shader
+++ b/UnitySDK/Assets/TiltBrush/Assets/Brushes/Basic/Smoke/Smoke.shader
@@ -95,7 +95,7 @@ Category {
         disp += float3(0,0,1) * curlZ(center_WS.xyz * freq + time, d);
         disp = disp * 5 * kDecimetersToWorldUnits;
 
-        center_WS.xyz += mul(xf_CS, disp);
+        center_WS.xyz += mul(xf_CS, float4(disp, 0));
 
         float4 corner = OrientParticle_WS(center_WS.xyz, halfSize, v.vid, rotation);
         o.vertex = mul(UNITY_MATRIX_VP, corner);