diff --git a/demo1.cpp b/demo1.cpp
index a7e17d0..59c2733 100644
--- a/demo1.cpp
+++ b/demo1.cpp
@@ -1026,17 +1026,12 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
           rgbToIndex(intensity/2,intensity,intensity/3) :
           rgbToIndex(intensity,intensity/2,0);
 
-  putSubsampledPixel // macro
+  putSubsampledPixel(pixel,c);
 }
 
 void draw()
 {
-  RCL_RayConstraints c;
-
-  c.maxHits = 8;
-  c.maxSteps = 10;
-
-  RCL_render(player.mCamera,floorHeightAt,ceilingHeightAt,textureAt,c);
+  RCL_render(player.mCamera,floorHeightAt,ceilingHeightAt,textureAt,defaultConstraints);
 
   RCL_Unit previousDepth;
 
@@ -1099,6 +1094,9 @@ int main()
 {
   initGeneral();
 
+  defaultConstraints.maxHits = 8;
+  defaultConstraints.maxSteps = 10;
+
   player.setPositionSquare(6,4);
 
   sprites[0] = Sprite(spriteStatue,10,5,1,100);
diff --git a/demo2.cpp b/demo2.cpp
index 29aa8f1..a10921d 100644
--- a/demo2.cpp
+++ b/demo2.cpp
@@ -961,24 +961,19 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
 
   }
 
-  putSubsampledPixel // macro
+  putSubsampledPixel(pixel,c);
 }
 
 void draw()
 {
-  RCL_RayConstraints c;
-
-  c.maxHits = 1;
-  c.maxSteps = 20;
-
 #ifdef HEAD_BOB
   player.mCamera.height += player.mHeadBob;
 #endif
 
 #ifdef RENDER_PRECISE
-  RCL_render(player.mCamera,floorHeightAt,0,textureAt,c);
+  RCL_render(player.mCamera,floorHeightAt,0,textureAt,defaultConstraints);
 #else
-  RCL_renderSimple(player.mCamera,floorHeightAt,textureAt,rollAt,c);
+  RCL_renderSimple(player.mCamera,floorHeightAt,textureAt,rollAt,defaultConstraints);
 #endif
 
 #ifdef HEAD_BOB
@@ -1001,6 +996,9 @@ int main()
 {
   initGeneral();
 
+  defaultConstraints.maxHits = 1;
+  defaultConstraints.maxSteps = 20;
+
   for (uint8_t i = 0; i < TEXTURES; ++i)
     textureAverageColors[i] = computeAverageColor(textures[i]);
 
diff --git a/demo3.cpp b/demo3.cpp
index c623eb4..e1de023 100644
--- a/demo3.cpp
+++ b/demo3.cpp
@@ -494,20 +494,15 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
   if (intensity != 0)
     c = addIntensity(c,intensity);
 
-  putSubsampledPixel // macro
+  putSubsampledPixel(pixel,c);
 }
 
 bool flyBy = true;
 
 void draw()
 {
-  RCL_RayConstraints c;
-
-  c.maxHits = 6;
-  c.maxSteps = 20;
-
   player.mCamera.height += player.mHeadBob;
-  RCL_render(player.mCamera,floorHeightAt,0,colorAt,c);
+  RCL_render(player.mCamera,floorHeightAt,0,colorAt,defaultConstraints);
   player.mCamera.height -= player.mHeadBob;
 
   if (flyBy && (pokitto.frameCount >> 3) % 3 != 0)
@@ -554,6 +549,9 @@ int main()
 {
   initGeneral();
 
+  defaultConstraints.maxHits = 6;
+  defaultConstraints.maxSteps = 20;
+
   floorColor = rgbToIndex(4,2,0);
 
   squareColors[0] = rgbToIndex(0,0,3);
diff --git a/general.hpp b/general.hpp
index 1ee3092..a1006f4 100644
--- a/general.hpp
+++ b/general.hpp
@@ -72,22 +72,30 @@ Pokitto::Core pokitto;
 
 RCL_Unit zBuffer[SUBSAMPLED_WIDTH]; ///< 1D z-buffer for visibility determination.
 
+RCL_RayConstraints defaultConstraints;
+
 unsigned short palette[256];
 
-// helper macro for fast pixel drawing
 #ifdef POK_SIM
-  #define putSubsampledPixel\
-    pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE,pixel->position.y,c);\
-    pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE + 1,pixel->position.y,c);
+inline void putSubsampledPixel(RCL_PixelInfo *pixel, uint8_t color)
+{
+  pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE,pixel->position.y,color);
+  pokitto.display.drawPixel(pixel->position.x * SUBSAMPLE + 1,pixel->position.y,color);
+}
 #else
-  // this code breaks the simulator
-  #define putSubsampledPixel\
-    uint8_t *buf = pokitto.display.screenbuffer;\
-    buf += pixel->position.x * SUBSAMPLE;\
-    buf += pixel->position.y * SCREEN_WIDTH;\
-    for (uint8_t i = 0; i < SUBSAMPLE - 1; ++i)\
-      *buf++ = c;\
-    *buf = c;
+// This code breaks the simulator.
+inline void putSubsampledPixel(RCL_PixelInfo *pixel, uint8_t color)
+{
+  uint8_t *buf = pokitto.display.screenbuffer;
+
+  buf += pixel->position.x * SUBSAMPLE;
+  buf += pixel->position.y * SCREEN_WIDTH;
+
+  for (uint8_t i = 0; i < SUBSAMPLE - 1; ++i)
+    *buf++ = color;
+
+  *buf = color;
+}
 #endif
 
 /**
@@ -394,6 +402,8 @@ void initGeneral()
   pokitto.display.setFont(fontTiny);
   pokitto.display.persistence = 1;
 
+  RCL_initRayConstraints(&defaultConstraints);
+
   initPalette(); 
 
   for (uint8_t i = 0; i < SUBSAMPLED_WIDTH; ++i)