<Kernel.Scalar name="SetMaterial">
  <Parameter.EntityInstance name="particle" type="Particle" read="radius" write="material, mass, invMass"/>
  <Parameter.Scalar name="material" type="Physics.MaterialPtr" mode="READ"/>
</Kernel.Scalar>


<Kernel.Scalar name="SetMaterial">
  <Parameter.EntityPtr name="particle" type="Particle" read="radius" write="material, mass, invMass"/>
  <Parameter.Scalar name="material" type="Physics.MaterialPtr" mode="READ"/>
</Kernel.Scalar>
