#59: SHADOWS & LIGHT (Vue)
#58: ADVANCED DIRT MAPPING (Vue)
#57: SSS IN VUE 9, AND THE "SPECKLE" PROBLEM
#56: THE DEVIL IS IN THE DETAIL OF ART
#55: FIXING POSER CLOTHING
#54: MAKING "FOREST WAR - GOBLIN SHAMAN"
#53: MAKING A STUDIO RENDER FOR VUE
(and other apps)
#49: NEBULA MKIII (Vue)
#48: RENDER SETTINGS FOR VUE (Vue)
#47: POSTWORK - MAKING A RENDER INTENSE (Any)
#46: MAKING RIVERS THAT FOLLOW TERRAIN HEIGHTS (Vue or Bryce)

REFRACTION PROBLEMS IN VUE

A while ago, on the Renderosity forums, someone pointed out an unusual problem in Vue: glass was looking blue, even though it should have been clear!

Now, I wasn't the fella who figured out the answer, nor can I recall which clever person did, sorry! But here's what the problem was, and a simple solution :)

In CGI, goo renderers use "ray tracing" to work out how images should look. They beam out rays of light from the camera and work out how they'd bounce around and pick up colours.

The problem with glass is "internal reflections": light will bounce around inside glass, gemstones and the like, several times, before coming out. Now, the renderer has a problem, in that this may take a lot of bounces and a LOT of render time, or, it can bug and keep bouncing infinitely, so your render would never finish, eeek!

So, the renderer has a setting that sets how often it will count bounces, over that limit, it simply stops, and that's what causes the glass to look blue! You can see the effect in the pic below.

The fix is very easy though :) All you need to do is increase your renderer's number of maximum light bouncs.

In Vue, you open your render settings, select USER SETTINGS, then open the "Edit" button beside the "trace reflections" tab.

Then increase the amount up. Now, you can raise it to maximum, or even type in a higher number if need, or try a lower number if you wish to find a setting that will render quicker but sitll look ok.

  

Below is a pic detailing how to set this.

I hope you find this of use! :)

HOME
All original art, writing on this site, copyright of Steven James, "Silverblade the Enchanter" ©2012