Pathtracingisoneofseveraltechniquestorenderphotorealisticim-agesbysimulatingthephysicsoflightpropagationwithinascene.Therootsofpathtracingareoutsideofcomputergraphics,intheMonteCarlosimulationsdevelopedforneutrontransport.Agreatstrengthofpathtracingisthatitisconceptually,mathematic