From 2808c4bc9c2be7a7ec467580907f124fea9981be Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 23 Oct 2021 18:58:43 +0200
Subject: [PATCH] Mesh: Mesh.createBox() now accepts a bounding box as argument

---
 src/Mod/Mesh/App/AppMeshPy.cpp | 35 +++++++++++++++++++++++-----------
 src/Mod/Mesh/App/Mesh.cpp      | 32 +++++++++++++++++++++++++++++++
 src/Mod/Mesh/App/Mesh.h        |  1 +
 3 files changed, 57 insertions(+), 11 deletions(-)

diff --git a/src/Mod/Mesh/App/AppMeshPy.cpp b/src/Mod/Mesh/App/AppMeshPy.cpp
index 92a6524e7f..ccc80fe665 100644
--- a/src/Mod/Mesh/App/AppMeshPy.cpp
+++ b/src/Mod/Mesh/App/AppMeshPy.cpp
@@ -308,19 +308,32 @@ private:
     }
     Py::Object createBox(const Py::Tuple& args)
     {
-        float length = 10.0f;
-        float width = 10.0f;
-        float height = 10.0f;
-        float edgelen = -1.0f;
-        if (!PyArg_ParseTuple(args.ptr(), "|ffff",&length,&width,&height,&edgelen))
-            throw Py::Exception();
+        MeshObject* mesh = nullptr;
 
-        MeshObject* mesh;
-        if (edgelen < 0.0f)
-            mesh = MeshObject::createCube(length, width, height);
-        else
-            mesh = MeshObject::createCube(length, width, height, edgelen);
+        do {
+            float length = 10.0f;
+            float width = 10.0f;
+            float height = 10.0f;
+            float edgelen = -1.0f;
+            if (PyArg_ParseTuple(args.ptr(), "|ffff",&length,&width,&height,&edgelen)) {
+                if (edgelen < 0.0f)
+                    mesh = MeshObject::createCube(length, width, height);
+                else
+                    mesh = MeshObject::createCube(length, width, height, edgelen);
+                break;
+            }
 
+            PyErr_Clear();
+            PyObject* box;
+            if (PyArg_ParseTuple(args.ptr(), "O!",&Base::BoundBoxPy::Type, &box)) {
+                Py::BoundingBox bbox(box, false);
+                mesh = MeshObject::createCube(bbox.getValue());
+                break;
+            }
+
+            throw Py::TypeError("Must be real numbers or BoundBox");
+        }
+        while (false);
         if (!mesh) {
             throw Py::Exception(Base::BaseExceptionFreeCADError, "Creation of box failed");
         }
diff --git a/src/Mod/Mesh/App/Mesh.cpp b/src/Mod/Mesh/App/Mesh.cpp
index e64d463218..463d6f19ba 100644
--- a/src/Mod/Mesh/App/Mesh.cpp
+++ b/src/Mod/Mesh/App/Mesh.cpp
@@ -30,6 +30,7 @@
 #include <CXX/Objects.hxx>
 #include <Base/Builder3D.h>
 #include <Base/Console.h>
+#include <Base/Converter.h>
 #include <Base/Exception.h>
 #include <Base/Writer.h>
 #include <Base/Reader.h>
@@ -1833,6 +1834,37 @@ MeshObject* MeshObject::createCube(float length, float width, float height, floa
     return nullptr;
 }
 
+MeshObject* MeshObject::createCube(const Base::BoundBox3d& bbox)
+{
+    std::vector<MeshCore::MeshGeomFacet> facets;
+    auto createFacet = [&bbox](int i, int j, int k) {
+        MeshCore::MeshGeomFacet facet;
+        facet._aclPoints[0] = Base::convertTo<Base::Vector3f>(bbox.CalcPoint(i));
+        facet._aclPoints[1] = Base::convertTo<Base::Vector3f>(bbox.CalcPoint(j));
+        facet._aclPoints[2] = Base::convertTo<Base::Vector3f>(bbox.CalcPoint(k));
+        facet.CalcNormal();
+        return facet;
+    };
+
+    facets.push_back(createFacet(0, 1, 2));
+    facets.push_back(createFacet(0, 2, 3));
+    facets.push_back(createFacet(0, 5, 1));
+    facets.push_back(createFacet(0, 4, 5));
+    facets.push_back(createFacet(0, 3, 7));
+    facets.push_back(createFacet(0, 7, 4));
+    facets.push_back(createFacet(4, 6, 5));
+    facets.push_back(createFacet(4, 7, 6));
+    facets.push_back(createFacet(1, 6, 2));
+    facets.push_back(createFacet(1, 5, 6));
+    facets.push_back(createFacet(2, 7, 3));
+    facets.push_back(createFacet(2, 6, 7));
+
+    Base::EmptySequencer seq;
+    std::unique_ptr<MeshObject> mesh(new MeshObject);
+    mesh->getKernel() = facets;
+    return mesh.release();
+}
+
 void MeshObject::addSegment(const Segment& s)
 {
     addSegment(s.getIndices());
diff --git a/src/Mod/Mesh/App/Mesh.h b/src/Mod/Mesh/App/Mesh.h
index 6d531802db..ea3f54ca1a 100644
--- a/src/Mod/Mesh/App/Mesh.h
+++ b/src/Mod/Mesh/App/Mesh.h
@@ -338,6 +338,7 @@ public:
     static MeshObject* createTorus(float, float, int);
     static MeshObject* createCube(float, float, float);
     static MeshObject* createCube(float, float, float, float);
+    static MeshObject* createCube(const Base::BoundBox3d&);
     //@}
 
 public: