User:Le Forgeron/HowTo/Perfect glass - Revision history

Le Forgeron: /* let me drink */

2012-09-30T17:52:36Z

let me drink

2012-09-30T17:44:39Z

let me drink

2012-09-30T17:38:09Z

let me drink

2012-09-30T17:37:51Z

Caveat about the shapes of liquid and air

2012-09-30T17:33:37Z

The right approach of CSG when pouring liquid

2012-09-30T16:30:27Z

Time for CSG

2012-09-30T16:24:49Z

Start

2012-09-30T16:22:22Z

Time for CSG

2012-09-30T16:13:39Z

Perfect glass

2012-09-30T16:13:26Z

Perfect glass

@@ Line 117: / Line 117: @@
 For the tube, the radius of the air cylinder is just made a bit larger than the one of the liquid: here there is 1% less of glass than for the liquid; did you see it ?
 |[[Image:LeForgeronTutoGlass3.png]]
 |}

← Older revision		Revision as of 17:44, 30 September 2012
Line 110:		Line 110:
	}		}
	</pre>		</pre>
		+	{\|class="matte" width="700px" cellpadding="0" cellspacing="10"
		+	\|To avoid a common surface, the cylinder of air must overlap a part of the cylinder of liquid.
		+
		+	For the cap, it's easy.
		+
		+	For the tube, the radius of the air cylinder is just made a bit larger than the one of the liquid: here there is 1% less of glass than for the liquid; did you see it ?
		+	\|[[Image:LeForgeronTutoGlass3.png]]
		+	\|}

@@ Line 101: / Line 101: @@
 			material { wat }
+		}
-−
+	}
 	cylinder { ...
 		hollow

← Older revision		Revision as of 17:37, 30 September 2012
Line 86:		Line 86:

	There is no reason for the shape of glass to ever meet the shape of the liquid (or only in the part removed later by the shape of air), so that's part is safe.		There is no reason for the shape of glass to ever meet the shape of the liquid (or only in the part removed later by the shape of air), so that's part is safe.
		+
		+	=== let me drink ===
		+	<pre>
		+	difference
		+	{
		+	union
		+	{
		+	cylinder { ...
		+	hollow
		+	material { glas }
		+	}
		+	cylinder { ...
		+	hollow
		+	material { wat }
		+	}
		+	}
		+	cylinder { ...
		+	hollow
		+	material { air }
		+	}
		+	cutaway_textures
		+	hollow
		+	}
		+	</pre>

← Older revision		Revision as of 17:33, 30 September 2012
Line 73:		Line 73:

	===The right approach of CSG when pouring liquid===		===The right approach of CSG when pouring liquid===
		+
		+	[[Image:LeForgeronTutoGlassCsg.png]]
		+
		+	The key points to make a glass with some liquid are:
		+	# to place the liquid inside the glass
		+	# to remove from that block the volume where the air is to be
		+
		+	==== Caveat about the shapes of liquid and air ====
		+	The coincident surface's noise appears as soon as two identical surfaces share an area.
		+
		+	As a consequence, the shape of the air and the shape of the liquid must share only, on their surface, a common line.
		+
		+	There is no reason for the shape of glass to ever meet the shape of the liquid (or only in the part removed later by the shape of air), so that's part is safe.

@@ Line 50: / Line 50: @@
 ===Time for CSG===
+{| class="matte" width="700px" cellpadding="0" cellspacing="10"
-To make an empty glass, we now remove from the block of glass the internal volume to be filled by the air.
+|[[Image:LeForgeronTutoGlass2.png]]
 <pre>
@@ Line 69: / Line 71: @@
 We hear you: "Yes, great. Nothing new under the sun so far!"

@@ Line 41: / Line 41: @@
 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).
 |}
 ===Time for CSG===

← Older revision		Revision as of 16:22, 30 September 2012
Line 43:		Line 43:

	===Time for CSG===		===Time for CSG===
		+
		+	To make an empty glass, we now remove from the block of glass the internal volume to be filled by the air.
		+
		+	<pre>
		+	difference
		+	{
		+	cylinder { ...
		+	hollow
		+	material { glas }
		+	}
		+	cylinder { ...
		+	hollow
		+	material { air }
		+	}
		+	cutaway_textures
		+	}
		+	</pre>
		+
		+	We hear you: "Yes, great. Nothing new under the sun so far!"

@@ Line 25: / Line 25: @@
 [[Image:LeForgeronTutoGlass.png]]
 From right to left:
 * an empty glass

@@ Line 23: / Line 23: @@
 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.
-{|
-![[Image:LeForgeronTutoGlass.png]]
+[[Image:LeForgeronTutoGlass.png]]
-! From right to left:
+From right to left:
 * an empty glass
 * an half-filled flass
 * a full glass
 * something that need to be explained
-|}
 ===Start===