I think most of the LuxBlend/LuxRender users use the “normal” glass because they don’t know how to set up the glass2 material and they don’t know the advantage of using the glass2 instead the glass material. In this little tutorial I want to introduce this useful material and compare both.
I made a little scene with the monkey head Suzanne to show you the difference between those two types of glass. You can download the .blend file here. Feel free to play with the material settings to generate your own glass head.
The following three points show the main difference between those two glass materials:
1. Chromatic Dispersion
Chromatic Dispersion is the phenomenon we all know, when we look for example at a bottle or a glass of water which lies directly in the sunshine or another strong light source (white light). The colors in white light becomes separated and visible to us because of the refraction. It’s the same thing with a rainbow or with the scientific example, a prism.
2. Absorption of light
Glass2 does, as you can see well at the ear of Suzanne on the picture above, a nice absorption of light and its color variation. This means, LuxRender handles glass2 as a volume, like it’s in “our real world”. (If you look into a deep lake, the water is pretty dark, almost grey. And the nearer you go to the beach, the brighter and “clearer” gets the color of the water. So it is more realistic.
3. Overall realistic
As you can see, the glass2 look is realistic to your eyes. It reminds you of water or another volume. The example below (glass) seems to be OK first, but if we compare, somethings is wrong with the colors there. It looks too flat. In addition, it’s easier to use glass2 for creating fluid and glass, like a bottle or a glass of water. With the normal glass material you have to create for each volume a mesh and after all, it doesn’t look as good as glass2 does. (I used glass2 for my bottle of Jack)
So don’t be afraid to use glass2, because the results are amazing! If you wish some tutorials for this, please leave a comment or use the contact form.