diff --git a/assets/opensb/rendering/effects/interface.config b/assets/opensb/rendering/effects/interface.config
index 4616e72..f153068 100644
--- a/assets/opensb/rendering/effects/interface.config
+++ b/assets/opensb/rendering/effects/interface.config
@@ -1,7 +1,13 @@
 {
   "blitFrameBuffer" : "main",
 
-  "effectParameters" : {},
+  "effectParameters" : {
+    "vertexRounding" : {
+      "type" : "bool",
+      "default" : false,
+      "uniform" : "vertexRounding"
+    }
+  },
   "effectTextures" : {},
 
   "effectShaders" : {
diff --git a/assets/opensb/rendering/effects/interface.vert b/assets/opensb/rendering/effects/interface.vert
index 14a7cea..dfd94d4 100644
--- a/assets/opensb/rendering/effects/interface.vert
+++ b/assets/opensb/rendering/effects/interface.vert
@@ -6,6 +6,7 @@ uniform vec2 textureSize2;
 uniform vec2 textureSize3;
 uniform vec2 screenSize;
 uniform mat3 vertexTransform;
+uniform bool vertexRounding;
 
 in vec2 vertexPosition;
 in vec4 vertexColor;
@@ -19,10 +20,14 @@ out vec4 fragmentColor;
 void main() {
   vec2 screenPosition = (vertexTransform * vec3(vertexPosition, 1.0)).xy;
   gl_Position = vec4(screenPosition / screenSize * 2.0 - 1.0, 0.0, 1.0);
-  if (((vertexData >> 3) & 0x1) == 1)
-    screenPosition.x = round(screenPosition.x);
-  if (((vertexData >> 4) & 0x1) == 1)
-    screenPosition.y = round(screenPosition.y);
+  
+  if (vertexRounding) {
+    if (((vertexData >> 3) & 0x1) == 1)
+      screenPosition.x = round(screenPosition.x);
+    if (((vertexData >> 4) & 0x1) == 1)
+      screenPosition.y = round(screenPosition.y);
+  }
+  
   int vertexTextureIndex = vertexData & 0x3;
   if (vertexTextureIndex == 3)
     fragmentTextureCoordinate = vertexTextureCoordinate / textureSize3;
diff --git a/assets/opensb/rendering/effects/world.config b/assets/opensb/rendering/effects/world.config
index d8ec1a9..3a55cfe 100644
--- a/assets/opensb/rendering/effects/world.config
+++ b/assets/opensb/rendering/effects/world.config
@@ -21,6 +21,11 @@
       "type" : "float",
       "default" : 1.0,
       "uniform" : "lightMapMultiplier"
+    },
+    "vertexRounding" : {
+      "type" : "bool",
+      "default" : false,
+      "uniform" : "vertexRounding"
     }
   },
 
diff --git a/assets/opensb/rendering/effects/world.vert b/assets/opensb/rendering/effects/world.vert
index ce8a9fc..f41c0a8 100644
--- a/assets/opensb/rendering/effects/world.vert
+++ b/assets/opensb/rendering/effects/world.vert
@@ -6,6 +6,7 @@ uniform vec2 textureSize2;
 uniform vec2 textureSize3;
 uniform vec2 screenSize;
 uniform mat3 vertexTransform;
+uniform bool vertexRounding;
 uniform vec2 lightMapSize;
 uniform vec2 lightMapScale;
 uniform vec2 lightMapOffset;
@@ -24,11 +25,13 @@ out vec2 fragmentLightMapCoordinate;
 void main() {
   vec2 screenPosition = (vertexTransform * vec3(vertexPosition, 1.0)).xy;
 
-  if (((vertexData >> 3) & 0x1) == 1)
-    screenPosition.x = round(screenPosition.x);
-  if (((vertexData >> 4) & 0x1) == 1)
-    screenPosition.y = round(screenPosition.y);
-
+  if (vertexRounding) {
+    if (((vertexData >> 3) & 0x1) == 1)
+      screenPosition.x = round(screenPosition.x);
+    if (((vertexData >> 4) & 0x1) == 1)
+      screenPosition.y = round(screenPosition.y);
+  }
+  
   fragmentLightMapMultiplier = float((vertexData >> 2) & 0x1);
   int vertexTextureIndex = vertexData & 0x3;
   fragmentLightMapCoordinate = (screenPosition / lightMapScale) - lightMapOffset * lightMapSize / screenSize;
diff --git a/source/application/StarRenderer_opengl.cpp b/source/application/StarRenderer_opengl.cpp
index 401acc7..f0e4dfd 100644
--- a/source/application/StarRenderer_opengl.cpp
+++ b/source/application/StarRenderer_opengl.cpp
@@ -394,6 +394,8 @@ bool OpenGlRenderer::switchEffectConfig(String const& name) {
   setupGlUniforms(effect);
   m_currentEffect = &effect;
 
+  setEffectParameter("vertexRounding", m_multiSampling > 0);
+
   return true;
 }
 
@@ -432,7 +434,7 @@ void OpenGlRenderer::setMultiSampling(unsigned multiSampling) {
   if (m_multiSampling) {
     glEnable(GL_MULTISAMPLE);
     glEnable(GL_SAMPLE_SHADING);
-    glMinSampleShading(1.0f);
+    glMinSampleShading(1.f);
   } else {
     glMinSampleShading(0.f);
     glDisable(GL_SAMPLE_SHADING);
diff --git a/source/base/StarCellularLighting.cpp b/source/base/StarCellularLighting.cpp
index ebca0ad..48ba265 100644
--- a/source/base/StarCellularLighting.cpp
+++ b/source/base/StarCellularLighting.cpp
@@ -223,7 +223,7 @@ void CellularLightIntensityCalculator::addSpreadLight(Vec2F const& position, flo
 
 void CellularLightIntensityCalculator::addPointLight(Vec2F const& position, float light, float beam, float beamAngle, float beamAmbience) {
   Vec2F arrayPosition = position - Vec2F(m_calculationRegion.min());
-  m_lightArray.addPointLight({arrayPosition, light, beam, beamAngle, beamAmbience});
+  m_lightArray.addPointLight({arrayPosition, light, beam, beamAngle, beamAmbience, false});
 }
 
 
diff --git a/source/base/StarMemoryAssetSource.cpp b/source/base/StarMemoryAssetSource.cpp
index a0c220d..a7554b6 100644
--- a/source/base/StarMemoryAssetSource.cpp
+++ b/source/base/StarMemoryAssetSource.cpp
@@ -45,7 +45,7 @@ IODevicePtr MemoryAssetSource::open(String const& path) {
     String deviceName() const override { return name; }
 
     bool atEnd() override {
-      return assetPos >= assetSize;
+      return assetPos >= (StreamOffset)assetSize;
     }
 
     void seek(StreamOffset p, IOSeek mode) override {
diff --git a/source/core/StarMatrix3.hpp b/source/core/StarMatrix3.hpp
index 04d8005..8cdd2d5 100644
--- a/source/core/StarMatrix3.hpp
+++ b/source/core/StarMatrix3.hpp
@@ -110,6 +110,8 @@ public:
   template <typename T2>
   Vec3 operator*(Vector<T2, 3> const& v) const;
 
+  template <typename T2>
+  Vec2 operator*(Vector<T2, 2> const& v) const;
 private:
   Rows m_rows;
 };
@@ -304,8 +306,7 @@ void Matrix3<T>::scale(T scale, Vec2 const& point) {
 template <typename T>
 template <typename T2>
 Vector<T2, 2> Matrix3<T>::transformVec2(Vector<T2, 2> const& point) const {
-  Vector<T2, 3> res = (*this) * Vector<T2, 3>(point, 1);
-  return res.vec2();
+  return (*this) * point;
 }
 
 template <typename T>
@@ -412,6 +413,13 @@ auto Matrix3<T>::operator*(const Vector<T2, 3>& u) const -> Vec3 {
       m_rows[2][0] * u[0] + m_rows[2][1] * u[1] + m_rows[2][2] * u[2]);
 }
 
+template <typename T>
+template <typename T2>
+auto Matrix3<T>::operator*(const Vector<T2, 2>& u) const -> Vec2 {
+  return Vec2(m_rows[0][0] * u[0] + m_rows[0][1] * u[1] + m_rows[0][2],
+    m_rows[1][0] * u[0] + m_rows[1][1] * u[1] + m_rows[1][2]);
+}
+
 template <typename T>
 Matrix3<T> Matrix3<T>::operator/(const T& s) const {
   return Matrix3<T>(m_rows[0] / s, m_rows[1] / s, m_rows[2] / s);
diff --git a/source/rendering/StarDrawablePainter.cpp b/source/rendering/StarDrawablePainter.cpp
index 5f9fd79..88ca651 100644
--- a/source/rendering/StarDrawablePainter.cpp
+++ b/source/rendering/StarDrawablePainter.cpp
@@ -36,15 +36,13 @@ void DrawablePainter::drawDrawable(Drawable const& drawable) {
   } else if (auto imagePart = drawable.part.ptr<Drawable::ImagePart>()) {
     TexturePtr texture = m_textureGroup->loadTexture(imagePart->image);
 
+    Vec2F position = drawable.position;
     Vec2F textureSize(texture->size());
-    RectF imageRect(Vec2F(), textureSize);
-
-    Mat3F transformation = Mat3F::translation(drawable.position) * imagePart->transformation;
-
-    Vec2F lowerLeft = transformation.transformVec2(Vec2F(imageRect.xMin(), imageRect.yMin()));
-    Vec2F lowerRight = transformation.transformVec2(Vec2F(imageRect.xMax(), imageRect.yMin()));
-    Vec2F upperRight = transformation.transformVec2(Vec2F(imageRect.xMax(), imageRect.yMax()));
-    Vec2F upperLeft = transformation.transformVec2(Vec2F(imageRect.xMin(), imageRect.yMax()));
+    Mat3F transformation = imagePart->transformation;
+    Vec2F lowerLeft  = { transformation[0][2] += position.x(), transformation[1][2] += position.y() };
+    Vec2F lowerRight = transformation * Vec2F(textureSize.x(), 0.f);
+    Vec2F upperRight = transformation * textureSize;
+    Vec2F upperLeft  = transformation * Vec2F(0.f, textureSize.y());
 
     float param1 = drawable.fullbright ? 0.0f : 1.0f;
 
diff --git a/source/rendering/StarWorldCamera.cpp b/source/rendering/StarWorldCamera.cpp
index c0bc645..de23f3e 100644
--- a/source/rendering/StarWorldCamera.cpp
+++ b/source/rendering/StarWorldCamera.cpp
@@ -26,15 +26,17 @@ void WorldCamera::setCenterWorldPosition(Vec2F const& position, bool force) {
   // elements drawn in world space that are aligned with TilePixels will
   // eventually also be aligned to real screen pixels.
 
+  float ratio = TilePixels * m_pixelRatio;
+
   if (m_screenSize[0] % 2 == 0)
-    m_worldCenter[0] = round(m_worldCenter[0] * (TilePixels * m_pixelRatio)) / (TilePixels * m_pixelRatio);
+    m_worldCenter[0] = round(m_worldCenter[0] * ratio) / ratio;
   else
-    m_worldCenter[0] = (round(m_worldCenter[0] * (TilePixels * m_pixelRatio) + 0.5f) - 0.5f) / (TilePixels * m_pixelRatio);
+    m_worldCenter[0] = (round(m_worldCenter[0] * ratio + 0.5f) - 0.5f) / ratio;
 
   if (m_screenSize[1] % 2 == 0)
-    m_worldCenter[1] = round(m_worldCenter[1] * (TilePixels * m_pixelRatio)) / (TilePixels * m_pixelRatio);
+    m_worldCenter[1] = round(m_worldCenter[1] * ratio) / ratio;
   else
-    m_worldCenter[1] = (round(m_worldCenter[1] * (TilePixels * m_pixelRatio) + 0.5f) - 0.5f) / (TilePixels * m_pixelRatio);
+    m_worldCenter[1] = (round(m_worldCenter[1] * ratio + 0.5f) - 0.5f) / ratio;
 }
 
 }