• Code appears in cyan.
  
• Comments appear in purple.
• View the world here.
  

#VRML V1.0 ascii

Separator {

#Setup Lights, Camera, and Material as usuall

	DirectionalLight { direction 0 0 -1 }
	DirectionalLight { direction 0 -1 0 }
	PerspectiveCamera { 
		position 0 4 8
		orientation -1 0 0 0.4
	}
	Material {
		diffuseColor 1 0 0
		ambientColor 0.2 0  0
	}

#Here we create the two carbon atoms and the sigma bond
#between them.  Note that we DEFine several of the 
#components for use later in the world

	Separator {
		Translation { translation -2 0 0 }
		DEF carbon Sphere { radius 0.6 }
		Translation { translation 4 0 0 }
		USE carbon
		Translation { translation -2 0 0 }
		Rotation { rotation 0 0 1 1.570796 }
		DEF bondmat Material {
			diffuseColor 0 1 0
			ambientColor 0 0.2 0
		}
		Cylinder {
			height 4
			radius 0.1
			parts  SIDES
		}
	}

#Now we add two hyrdogens and bonds to the carbon
#atom at (-2,0,0).  This is done in a way that allows
#us to copy this segment, changing only two values, to
#do the same for the other carbon atom.

	Separator {
		Translation { translation -2 0 0 }
		Rotation { rotation 0 0 1 1.570796 }
		DEF r120 Rotation { rotation 1 0 0 2.094395 }
		DEF halfchbond Translation { translation 0 -1.2 0 }
		USE bondmat
		DEF chbond Cylinder {
			height 2.4
			radius 0.1
			parts SIDES
		}
		USE halfchbond
		DEF hmat Material {
			diffuseColor 1 1 1
			ambientColor 0.2 0.2 0.2
		}
		DEF hydrogen Sphere { radius 0.3 }
		Translation { translation 0 2.4 0 }
		USE r120
		USE halfchbond
		USE bondmat
		USE chbond
		USE halfchbond
		USE hmat
		USE hydrogen
	}

#This segment adds the two hydrogens and bonds to the
#carbon atom at (2,0,0).  It is copied from the above
#segment, changing only the sign of a couple of numbers

	Separator {
		Translation { translation 2 0 0 }
		Rotation { rotation 0 0 1 1.570796 }
		USE r120
		DEF halfchbond Translation { translation 0 1.2 0 }
		USE bondmat
		USE chbond
		USE halfchbond
		USE hmat
		USE hydrogen
		Translation { translation 0 -2.4 0 }
		USE r120
		USE halfchbond
		USE bondmat
		USE chbond
		USE halfchbond
		USE hmat
		USE hydrogen
	}

#Now we create a new material for the pi bond

	Material {
		diffuseColor 0 0 1
		ambientColor 0 0 0.2
	}

#Now we add the pi orbital to the carbon atom at
#(-2,0,0), using the same code as in the pi orbital
#example in example 4.

	Separator {
		Translation { translation -2 -1.2 0 }
		DEF mycone Cone {
			parts SIDES
			height 2
			bottomRadius 1
		}
		DEF halfpio Translation { translation 0 -1.2 0 }
		DEF ball Sphere { radius 1 }
		Rotation { rotation 1 0 0 3.151692 }
		USE halfpio
		USE halfpio
		USE halfpio
		USE mycone
		USE halfpio
		USE ball
	}

#Now we add the pi orbital to the carbon atom at
#(2,0,0), this code being a "copy and paste" of the
#segment above, with only a different initall translation

	Separator {
		Translation { translation 2 -1.2 0 }
		USE mycone
		USE halfpio
		USE ball
		Rotation { rotation 1 0 0 3.151692 }
		USE halfpio
		USE halfpio
		USE halfpio
		USE mycone
		USE halfpio
		USE ball
	}

#Now we create a semi-transparent material for use
#in the pi bond

	Material {
		diffuseColor 0 0 1
		ambientColor 0 0 0.2
		transparency 0.7
	}

#Now we add to semi-transparent cylinders between
#the pi orbitals on the two carbon atoms, representing
#a pi bond, and completeing the world

	Translation { translation 0 2.4 0 }
	Rotation { rotation 0 0 1 1.570796 }
	DEF pibond Cylinder {
		radius 0.8
		height 4
		parts SIDES
	}
	Translation { translation -4.8 0 0 }
	USE pibond
}


#End of File

Previous Topic (Chemistry in VRML)

Back to the VRML Reference

Back to the Main Page