jetzt haben wir einen komischen streifen

examples.c

@@ -45,8 +45,8 @@ void exampleSphere(int height, int width, int channels, unsigned char *image) {
     vec3 screenMiddlePoint = vec3Add(cam1.origin, vec3Scale(cam1.direction, cam1.screenDistance));
     vec3 screenTopLeft = vec3Add(
         vec3Add(screenMiddlePoint,
-            vec3Scale(screenY, cam1.height)),
+            vec3Scale(screenY, -cam1.height/2.0)),
-        vec3Scale(screenX, cam1.width)
+        vec3Scale(screenX, -cam1.width/2.0)
         );
     double pixelStepX = cam1.width / cam1.resolutionX;
     double pixelStepY = cam1.height / cam1.resolutionY;
@@ -69,7 +69,7 @@ void exampleSphere(int height, int width, int channels, unsigned char *image) {
         ray *lightRay = (ray *)malloc(sizeof(ray));;
         lightRay->origin = cam1.origin;
 
-        lightRay->direction = vec3Subtract(*pixelOrigin, cam1.origin);
+        lightRay->direction = vec3Normalize(vec3Subtract(*pixelOrigin, cam1.origin));
 
         pixelColor = raytraceSphere(&obj, lightRay);
         free(pixelOrigin);