Publishers of technology books, eBooks, and videos for creative people

Home > Articles > Digital Audio, Video > 3D

📄 Contents

  1. RAY TRACING: SPEEDING UP THINGS (OBJECTS)
  2. RAY TRACING: SPEEDING UP THINGS (GLOBALS)
  3. RAYTRACING: INDEX OF REFRACTION (IOR)
  4. RENDERING: FILTERS FOR STILL IMAGES VERSUS VIDEO
  5. RENDERING VIDEO: RENDER FRAMES, NOT FIELDS
  6. RENDERING VIDEO: MAKE SURE VIDEO COLOR CHECK IS ON
  7. RENDERING VIDEO: CHECK YOUR GAMMA!
  8. RENDERING GREAT BIG, GIANT, HONKING, ENORMOUS IMAGES SUCCESSFULLY
  9. DON'T RENDER MOVIES—RENDER FRAMES!
  10. SPEAKING OF THE RAM PLAYER...
  11. RERENDERING FROM THE ENVIRONMENT BACKGROUND
  12. OKAY, SO YOU REALLY WANT TO RERENDER YOUR ANIMATION...
  13. IFL = IMAGE FILE LIST
  14. YOU CAN'T CREATE .IFL FILES ON READ-ONLY MEDIA!
  15. MANIPULATING IMAGE SEQUENCES USING .IFLS
  16. CREATE NESTED .IFL FILES
  17. A CHICKEN AND EGG PROBLEM: HOW DO YOU SET UP AN ANIMATED BACKGROUND FOR A SCENE IF YOU HAVEN'T RENDERED THE BACKGROUND YET?
  18. COULD YOU MAKE THINGS MORE COMPLICATED, PLEASE? (WHAT ABOUT USING A COMPOSITING PROGRAM?)
  19. COMPOSITING USING VIDEO POST
  20. RENDERING WITH SCANLINE MOTION BLUR: MULTI-PASS AND IMAGE
  21. RENDERING WITH SCANLINE: MIX IMAGE AND MULTI-PASS MOTION BLUR
  22. RENDERING IMAGES FOR PRINT: TEACH THOSE PRINT FOLKS A LESSON (OR TWO...)
  23. RENDERING IMAGES FOR PRINT: OH YEAH, ANOTHER THING...
  24. "THOSE PRINT PEOPLE"—MAKE IT EASIER ON THEM WITH 3DS MAX 6
  25. THE PRINT SIZE WIZARD (ENOUGH WITH THE PRINTING STUFF ALREADY!)
  26. MENTAL RAY IS IN THE BUILDING!
  27. MENTAL RAY IS ON THE COUCH!
  28. USE MENTAL RAY'S IMAGE SAMPLING WISELY
  29. IN MENTAL RAY, CONTRAST CAN SAVE YOUR DAY!
  30. HIDDEN LINE RENDERING: RENDER TO VECTORS IN MENTAL RAY
  31. TRIM YOUR (BSP) TREE IN MENTAL RAY
  32. MENTAL RAY PREFERENCES: PLEASE LEAVE ME A MESSAGE
  33. RENDERING AESTHETICS: OUTER SPACE SCENES
  34. RENDERING AESTHETICS: UNDERWATER SCENES
  35. RENDERING AESTHETICS: DISTANT LANDSCAPES
  36. RENDERING AESTHETICS: STILL LIFE AND MACROPHOTOGRAPHY
  37. "HELLO... YOU'VE GOT RENDER!"
  • Print
  • + Share This
This chapter is from the book

This chapter is from the book

RAYTRACING: INDEX OF REFRACTION (IOR)

One of ray tracing's great strengths (besides creating physically realistic reflections for chrome surfaces and the like) is its capability to replicate the look of transparent materials. When light passes through a transparent surface, the light is typically bent or distorted. This distortion is known as refraction, and the amount of refraction is known as the index of refraction (IOR). The IOR results from the relative speed of light as it passes through a transparent medium relative to the medium that the viewer is in. Often, the more dense the object, the higher the IOR value will be.

Do you want to render realistic transparent objects using the 3ds max Raytrace material, but you can't find that convenient chart listing common substances and their IORs? Well, copy this down and put it in your pocket so that you can answer accurately the next time some stranger asks you, "Hey, dude, you gotta tell me—what's the IOR of table salt again?"

Material

IOR

Air

1.0003

Water

1.33

Ethyl alcohol

1.36

Glass

1.5–1.7

Lucite or Plexiglas

1.51

Crown glass

1.52

Sodium chloride (salt)

1.544

Quartz

1.544

Flint glass

1.58

Diamond

2.42


To use these values, just place them in the IOR spinner. (In the Raytrace material, the spinner is in the Raytrace Basic Parameters rollout; in the Standard material, it's in the Extended Parameters rollout.)

  • + Share This
  • 🔖 Save To Your Account