HollowSphere: corr

Sample/HardParticle/HollowSphere.cpp

@@ -61,5 +61,6 @@ std::string HollowSphere::validate() const
 
     // TODO very questionable
     m_shape3D = std::make_unique<TruncatedEllipsoidNet>(m_mean, m_mean, m_mean, 2.0 * m_mean, 0.0);
+    m_validated = true;
     return "";
 }