fix bottom of rough box

Img3D/Mesh/Box.cpp

@@ -47,11 +47,13 @@ Geometry::Mesh Geometry::meshBox()
 
 Geometry::Mesh Geometry::meshRoughBox(const double2d_t* topR, const double2d_t* bottomR)
 {
-    ASSERT(topR);
-    ASSERT(topR->size());
+    ASSERT(topR || bottomR);
+    const double2d_t* base = topR ? topR : bottomR;
+    ASSERT(base->size());
 
-    const auto& t = *topR;
-    const auto& b = bottomR ? *bottomR : double2d_t(t.size(), std::vector<double>(t[0].size()));
+    const auto& t = topR ? *topR : double2d_t(base->size(), std::vector<double>(base[0].size()));
+    const auto& b =
+        bottomR ? *bottomR : double2d_t(base->size(), std::vector<double>(base[0].size()));
 
     float const D = 0.5f;
 

Img3D/Model/PlottableBody.cpp

@@ -71,7 +71,7 @@ PlottableBody::PlottableBody(GeometricID::Key gky_, const double2d_t* top, const
     , m_color(clrObject)
     , gky(gky_)
 {
-    if (top)
+    if (top || bottom)
         m_geo = std::shared_ptr<Geometry>(new Geometry(gky, top, bottom));
 }