Updated GUI library

code/lib/geometry.h

@@ -37,9 +37,9 @@ struct Box
 inline bool is_inside(Box b, v3 p)
 {
 	return
-		(p.x < b.min.x || p.x > b.max.x) ||
-		(p.y < b.min.y || p.y > b.max.y) ||
-		(p.z < b.min.z || p.z > b.max.z);
+		(p.x > b.min.x && p.x < b.max.x) &&
+		(p.y > b.min.y && p.y < b.max.y) &&
+		(p.z > b.min.z && p.z < b.max.z);
 }
 
 inline bool overlaps(Box a, Box b)
@@ -67,7 +67,7 @@ inline Box box_from_point_cloud(v3 *points, u32 count)
 	Box box;
 	box.min = points[0];
 	box.max = points[0];
-	for(u32 i = 0; i < count; i++)
+	for(u32 i = 1; i < count; i++)
 	{
 		v3 p = points[i];
 		box.min.x = minimum(box.min.x, p.x);
@@ -302,6 +302,17 @@ inline m4 scale(f32 factor)
 }
 
 
+// Other geometric algebra
+inline void compute_basis(v3 a, v3 *b, v3 *c)
+{
+	// from https://box2d.org/posts/2014/02/computing-a-basis/
+	if(abs(a.x) >= 0.57735f)
+		*b = {a.y, -a.x, 0.0f};
+	else
+		*b = {0.0f, a.z, -a.y};
+	*b = normalize(*b);
+	*c = cross(a, *b);
+}
 
 
 // Primitives