diff --git a/raycastlib.h b/raycastlib.h
index d6b1096..bccfaec 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -1071,14 +1071,11 @@ void _columnFunctionSimple(HitResult *hits, uint16_t hitCount, uint16_t x,
 
       int16_t wallHeightWorld = _floorFunction(hit.square.x,hit.square.y);
 
-      wallHeightWorld = wallHeightWorld != 0 ? wallHeightWorld : 1;
-      // ^ prevent division by zero
-
       wallHeightScreen = perspectiveScale((wallHeightWorld *
         _camera.resolution.y) / UNITS_PER_SQUARE,dist);
 
-      int16_t normalizedWallHeight = 
-        (UNITS_PER_SQUARE * wallHeightScreen) / wallHeightWorld;
+      int16_t normalizedWallHeight = wallHeightWorld != 0 ?
+        ((UNITS_PER_SQUARE * wallHeightScreen) / wallHeightWorld) : 0;
 
       heightOffset = perspectiveScale(_cameraHeightScreen,dist);
 
diff --git a/testTerminal.c b/testTerminal.c
new file mode 100644
index 0000000..f9cf9f6
--- /dev/null
+++ b/testTerminal.c
@@ -0,0 +1,104 @@
+#include <stdio.h>
+#include "raycastlib.h"
+#include <unistd.h>
+
+#define LEVEL_W 20
+#define LEVEL_H 15
+
+#define SCREEN_W 60
+#define SCREEN_H 20
+
+char pixels[SCREEN_W * SCREEN_H];
+Camera camera;
+
+int8_t level[LEVEL_W * LEVEL_H] =
+{
+/*                      11  13  15  17  19 
+  0 1 2 3 4 5 6 7 8 9 10  12  14  16  18  */
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, // 0
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, // 1
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, // 2
+  0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, // 3
+  0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0, // 4
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 5
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 6
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 7
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 8
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 9
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 10
+  0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0, // 11
+  0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0, // 12
+  0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0, // 13
+  0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0  // 14
+};
+
+Unit heightAt(int16_t x, int16_t y)
+{
+  if (x < 0 || x >= SCREEN_W || y < 0 || y >= SCREEN_H)
+    return UNITS_PER_SQUARE * 2;
+
+return 0;
+//  return level[y * LEVEL_W + x] * UNITS_PER_SQUARE * 2;
+}
+
+void pixelFunc(PixelInfo *p)
+{
+  char c = '.';
+
+  if (p->isWall)
+  {
+    switch (p->hit.direction)
+    {
+      case 0:  c = 'X'; break;
+      case 1:  c = '#'; break;
+      case 2:  c = 'p'; break;
+      case 3:
+      default: c = 'o'; break;
+    }
+  }
+
+  pixels[p->position.y * SCREEN_W + p->position.x] = c;
+}
+
+void draw()
+{
+  for (int i = 0; i < 10; ++i)
+  printf("\n");
+
+  RayConstraints c;
+
+  initRayConstraints(&c);
+
+  c.maxHits = 1;
+  c.maxSteps = 40;
+  c.computeTextureCoords = 0;
+
+  renderSimple(camera,heightAt,0,pixelFunc,0,c);
+
+  for (int j = 0; j < SCREEN_H; ++j)
+  {
+    for (int i = 0; i < SCREEN_W; ++i)
+      printf("%c",pixels[j * SCREEN_W + i]);   
+
+    printf("\n");
+  }
+}
+
+int main()
+{
+  initCamera(&camera);
+  camera.position.x = 2 * UNITS_PER_SQUARE;
+  camera.position.y = 2 * UNITS_PER_SQUARE;
+  camera.direction = -UNITS_PER_SQUARE / 3; //0;//(3 * UNITS_PER_SQUARE) / 4;
+  camera.resolution.x = SCREEN_W;
+  camera.resolution.y = SCREEN_H;
+
+  for (int i = 0; i < 100; ++i)
+  {
+    draw();
+    camera.position.x += 100;
+    usleep(100000);
+  }
+
+  return 0;
+}