This lesson gives a sample lesson plan for involving the V-Ray 2-Sided Material module into a lecture.




  • Start with discussing and showing some pictures of real world cases of thin translucent materials
    • In the case of these materials the direction from which they are illuminated. When light is coming from behind the surface we can see some of the features of the material on the other side
    • Some good examples are a lampshade or curtains lit by the sun
  • To simulate this effect in a completely physically accurate manner would require a lot of calculations
  • The V-Ray 2-Sided Material allows us to create thin translucent materials in a much more efficient way
    • It’s important to note that in order to get the proper effect the geometry needs to be “one-sided” i.e. not a box or a shell. V-Ray needs to evaluate the illumination at both sides of a face (in the direction of the normal and on the other side)
    • Translucency – a gray scale value that controls how much of the back material is visible. Can be mapped to create more complex effects.


  • In this cycle, you can use the provided scene and handout to demonstrate how to set up the V-Ray 2-Sided material in order to create a translucent fabric


  • In this cycle, you are going to let your students experiment with the provided scene. You may want to give them the provided handouts to use as a guideline



Available materials

Lesson plan download

Presentation (Lecture) download

Activity handout download