diff --git a/core/shared/src/main/scala/eu/joaocosta/minart/geometry/ConvexPolygon.scala b/core/shared/src/main/scala/eu/joaocosta/minart/geometry/ConvexPolygon.scala
index 34b20c62..513423fc 100644
--- a/core/shared/src/main/scala/eu/joaocosta/minart/geometry/ConvexPolygon.scala
+++ b/core/shared/src/main/scala/eu/joaocosta/minart/geometry/ConvexPolygon.scala
@@ -45,14 +45,14 @@ final case class ConvexPolygon(vertices: Vector[Shape.Point]) extends Shape {
       .sum
 
   def faceAt(x: Int, y: Int): Option[Shape.Face] = {
-    val sides = rawWeights(x, y).map(_ >= 0).distinct.toVector
+    val sides = rawWeights(x, y).filter(_ != 0).map(_ >= 0).distinct.toVector
     if (sides.size == 1) {
       if (sides.head) Shape.someFront else Shape.someBack
     } else None
   }
 
   override def contains(x: Int, y: Int): Boolean = {
-    rawWeights(x, y).map(_ >= 0).distinct.size == 1
+    rawWeights(x, y).filter(_ != 0).map(_ >= 0).distinct.size == 1
   }
 
   /** Checks if this polygon contains another polygon.
diff --git a/core/shared/src/main/scala/eu/joaocosta/minart/graphics/MutableSurface.scala b/core/shared/src/main/scala/eu/joaocosta/minart/graphics/MutableSurface.scala
index 1bcb4dd6..a2b57c92 100644
--- a/core/shared/src/main/scala/eu/joaocosta/minart/graphics/MutableSurface.scala
+++ b/core/shared/src/main/scala/eu/joaocosta/minart/graphics/MutableSurface.scala
@@ -115,8 +115,8 @@ trait MutableSurface extends Surface {
     * @param frontfaceColor color of the front face
     * @param backfaceColor color of the back face
     * @param blendMode blend strategy to use
-    * @param x position of the shap origin on the destination surface
-    * @param y position of the shap origin on the destination surface
+    * @param x position of the shape origin on the destination surface
+    * @param y position of the shape origin on the destination surface
     */
   def rasterize(
       shape: Shape,
@@ -124,7 +124,7 @@ trait MutableSurface extends Surface {
       backfaceColor: Option[Color] = None,
       blendMode: BlendMode = BlendMode.Copy
   )(x: Int, y: Int): Unit = {
-    Rasterizer.rasterizeShape(this, shape.translate(-x, -y), frontfaceColor, backfaceColor, blendMode)
+    Rasterizer.rasterizeShape(this, shape.translate(x, y), frontfaceColor, backfaceColor, blendMode)
   }
 
   /** Modifies this surface using surface view transformations