control primitive drawing order

examples/testbed/tests/convex_hull.h

@@ -72,11 +72,52 @@ public:
 		b3QHull hull;
 		hull.Set(m_points, m_count);
 
-		b3HullShape shape;
-		shape.m_hull = &hull;
+		for (u32 i = 0; i < m_count; ++i)
+		{
+			b3Draw_draw->DrawPoint(m_points[i], 4.0f, b3Color_green);
+		}
+
+		for (u32 i = 0; i < hull.edgeCount; i += 2)
+		{
+			const b3HalfEdge* edge = hull.GetEdge(i);
+			const b3HalfEdge* twin = hull.GetEdge(i + 1);
+
+			b3Vec3 v1 = hull.GetVertex(edge->origin);
+			b3Vec3 v2 = hull.GetVertex(twin->origin);
+
+			b3Draw_draw->DrawSegment(v1, v2, b3Color_black);
+		}
+
+		g_draw->Flush();
+
+		for (u32 i = 0; i < hull.faceCount; ++i)
+		{
+			const b3Face* face = hull.GetFace(i);
+			const b3HalfEdge* begin = hull.GetEdge(face->edge);
+
+			b3Vec3 n = hull.GetPlane(i).normal;
+
+			const b3HalfEdge* edge = hull.GetEdge(begin->next);
+			do
+			{
+				u32 i1 = begin->origin;
+				u32 i2 = edge->origin;
+				const b3HalfEdge* next = hull.GetEdge(edge->next);
+				u32 i3 = next->origin;
+
+				b3Vec3 v1 = hull.GetVertex(i1);
+				b3Vec3 v2 = hull.GetVertex(i2);
+				b3Vec3 v3 = hull.GetVertex(i3);
+
+				b3Color solidColor(1.0f, 1.0f, 1.0f, 0.5f);
+				g_draw->DrawSolidTriangle(n, v1, v2, v3, solidColor);
+
+				edge = next;
+			} while (hull.GetEdge(edge->next) != begin);
+		}
+
+		g_draw->Flush();
 
-		g_draw->DrawSolidShape(&shape, b3Color_white, b3Transform_identity);
-		
 		g_draw->DrawString(b3Color_white, "G - Generate a random convex hull");
 	}