diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d163863
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
\ No newline at end of file
diff --git a/examples/exampleB/exampleB.cpp b/examples/exampleB/exampleB.cpp
index 231fb12..29b567c 100644
--- a/examples/exampleB/exampleB.cpp
+++ b/examples/exampleB/exampleB.cpp
@@ -24,7 +24,7 @@
 
 int main()
 {
-   Rectangle *r[12];
+   Rectangle *r[25];
    PointLight *Light1;
 
    initDefaultMaterial();
diff --git a/include/Tracer.h b/include/Tracer.h
index 23a67c9..6f22c86 100644
--- a/include/Tracer.h
+++ b/include/Tracer.h
@@ -2,6 +2,7 @@
 //  @brief Some common raytracing globals/protos/inlines
 //
 #pragma once
+#define _USE_MATH_DEFINES 
 
 #include <math.h>
 #include <stdlib.h>
diff --git a/include/geom/Triangle.h b/include/geom/Triangle.h
index fb9eeb9..7216bc2 100644
--- a/include/geom/Triangle.h
+++ b/include/geom/Triangle.h
@@ -8,7 +8,7 @@
 class Triangle : public Rectangle
 {
 public:
-    Triangle( Vector& l, Vector& s1, Vector& s2 ) : Rectangle(l,s1,s2) {}
+    Triangle( const Vector& l, const Vector& s1, const Vector& s2 ) : Rectangle(l,s1,s2) {}
 
     bool intersect(Ray&, double&) override;
 };
diff --git a/src/image/Targa.cpp b/src/image/Targa.cpp
index 086883b..3138367 100644
--- a/src/image/Targa.cpp
+++ b/src/image/Targa.cpp
@@ -22,7 +22,7 @@ void targa_header::save(DataSink& ds)
 
 TargaImage::TargaImage( char const*name, int width, int height, char *comment )
 {
-    FILE *fp = fopen(name, "w");
+    FILE *fp = fopen(name, "wb");
     file = new FileDataSink(fp);
     buf_size = 1000;
     buffer = new rgb [buf_size];
diff --git a/src/render/ADRender.cpp b/src/render/ADRender.cpp
index fc88305..c7e0d3e 100644
--- a/src/render/ADRender.cpp
+++ b/src/render/ADRender.cpp
@@ -18,6 +18,10 @@ void adaptive_distributed_render_scene(
 {
    double x,y;                // sample point
    Ray   ray;                 // pixel ray
+   
+   nx *= 4;
+   ny *= 4;
+   
    double hx = 2.0   * HalfWidth / nx;   // pixel width
    double hy = 2.0   * HalfHeight / ny;     // pixel height
    double hxSub = hx /  nxSub;
diff --git a/src/render/DRender.cpp b/src/render/DRender.cpp
index b870ccb..49276de 100644
--- a/src/render/DRender.cpp
+++ b/src/render/DRender.cpp
@@ -20,6 +20,11 @@ void distributed_render_scene(
 {
    double x,y;                // sample point
    Ray   ray;                 // pixel ray
+   
+   
+   nx *= 4;
+   ny *= 4;
+   
    double hx = 2.0   * half_width / nx;      // pixel width
    double hy = 2.0   * half_height /   ny;      // pixel height
    double hx_sub =   hx / nx_sub;         // hz subdivision
diff --git a/src/render/Render.cpp b/src/render/Render.cpp
index 701699a..10a1673 100644
--- a/src/render/Render.cpp
+++ b/src/render/Render.cpp
@@ -16,6 +16,10 @@ void render_scene(Scene* scene, double half_width, double half_height,
                char const* fname)
 {
    double x, y;
+   
+   nx *= 4;
+   ny *= 4;
+   
    double hx = 2.0   * half_width  /   nx;
    double hy = 2.0   * half_height /   ny;
    Ray   ray;