User:Le Forgeron/HowTo/Perfect glass

Perfect glass

Welcome, if you are tired of coincident surface in your non opaque fluid containers, it might be the right place.

An easy test, as multiple-choice questions, to check the lesson of today:

• How do you make an empty plate ?
  1. You select a material, a shape and combine both.

• How do you make an empty glass ?
  1. You select a material, a shape and combine both.

• How do you put a cake on a plate ?
  1. Take the plate and and move the cake to the plate.

• How do you fill a glass with a liquid ?
  1. Take the empty glass and pour the liquid, well put the liquid in a suitable shape and move it to the glass.
  2. Mu. This is a non-sense.

The right answer is 2: to achieve a glass with some liquid, you should not start with an empty glass.

If you start with a filled glass, you might end with an empty glass. But the reversal is bogus: you would get coincident surface and its noise.

	From right to left: an empty glass an half-filled flass a full glass something that need to be explained

Start

You should start with the shape of the glass, but only its outer shape. For the time being, consider a massively filled piece of glass. Here we just take a basic cylinder, but so far any shape can do. The straw is just a bonus to check the actual effect of the variation of the index of refraction (ior) between normal space (1.0) and the transparent material of the glass (find many in glass.inc).