VPython 3D Objects: Difference between revisions

Revision as of 21:47, 28 November 2017

Claimed by Do Won Kim (Fall 2017) (In Progress)

The main purpose of the VPython programming language is to create 3D simulation with creating the 3D objects. To achieve this purpose, VPython already contains a number of built-in 3-dimensional objects, and these objects are displayed in a 3D graphics module called Visual. Familiarizing with these objects is important for lab coding.

Before start coding, make sure to have

from __future__ import division
from visual import *

on the top of your script.

This document is written based on VPython 7.

List of 3D Objects

Image of Each Objects

VPython is packaged with a variety of 3-Dimensional objects. By clicking each names of the objects, you can go to the official description of each objects from Glowscript.

Arrow

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example arrow

Box

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example box

Cone

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example cone

Curve

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example curve

Cylinder

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example cylinder

Ellipsoid

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example ellipsoid

Extrusion

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example extrusion

Helix

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example helix

Label

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example label

Points

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example points

Pyramid

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example pyramid

Ring

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example ring

Sphere

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example sphere

Text

Error creating thumbnail: sh: /usr/bin/convert: No such file or directory Error code: 127

Example text

Example Code of Each Objects

Arrow

a = arrow(pos=(0,2,1),axis=(5,0,0), color = color.red)

Box

b = box(pos=(0,0,0),length=3, height=3, width=3, color = color.orange)

Cone

c = cone(pos=(0,0,0),axis=vector(2,0,0), radius=1, color = color.yellow)

Curve

c = curve(pos=[(-1,-1,0), (1,-1,0)], color = color.green) #create object
c.append(pos=(3,2,-2)) #append next position vector
c.append(pos=(4,1,2))

Cylinder

c = cylinder(pos=vector(0,2,1), axis=vector(5,0,0), radius=1, color=color.cyan)

Ellipsoid

e = ellipsoid(pos=vector(0,0,0), length=3, height=5, width=7, color=color.blue)

Extrusion

#define polygons first
tri = Polygon( [(-2,0), (0,4), (2,0)] )
circ = shapes.circle(pos=(0,1.5), radius=0.8)
straight = [(0,0,0),(0,0,-4)]
#create extrusion
e = extrusion(pos=straight, shape=tri-circ, color=color.magenta)

Helix

h = helix(pos=vector(0,2,1), axis=vector(5,0,0), radius=0.5, color=(0.96,0.73,0.14))

Label

l = label(pos=vector(0,0.25,0), text='This is a Label', xoffset=20, yoffset=50, space=30, height=16, border=4,font='sans')

Points

p = points(pos=[vector(-1,0,0), vector(1,0,0)], radius=50, color=(1,1,.94))

Pyramid

p = pyramid(pos=vector(5,2,0), size=vector(3,3,2), color=(0.82, 0.41, 0.12))

Ring

r = ring(pos=vector(1,1,1), axis=vector(0,1,0),radius=0.5, thickness=0.1, color=(0.14, 1, 0.83))

Sphere

s = s = sphere(pos=vector(1,1,1), radius=5, color=(0.5, 1, 0.5))

Text

t = text(text='This is \ntext', #use \n for changing line
    align='center', color=(0.94, 0.90, 0.55))

Commonly Used Objects

The following objects are often used in class lab.

Sphere

The sphere object can be used to represent a wide variety of things, but it is mostly used to represent spherical objects such as planets or particles such as protons and electrons. Two things must be set; the position (vector), and the radius (numerical value).

Arrow

The arrow is perhaps the most important object for Physics simulation. It can be used to represent various forces as well as visualizing vectors. To create an arrow the position (vector), axis (vector), and the shaftwidth (a numerical value) must be set.

Object Uses

VPython Syntax of each objects

sphere1 = sphere(pos=vector(4,8,15), radius=16)

arrow1 = arrow(pos=vector(4,8,15), axis=vector(16,23,42)

helix1 = helix(pos=vector(4,8,15), axis=vector(16,23,42) radius=.23)

Modeling Fields

from visual import *
mzofp = 1e-7
oofpez = 9e9
qe = 1.6e-19

proton = sphere(pos=vector(3e-10,0,0), radius=1e-11, color=color.red)
velocity = vector(-5.2e4,0,0) #The proton's velocity
r_obs = vector(0,8e-11,0) #The observation location
deltat = 1e-19 #Timestep

while proton.x < 5e-10:

r = r_obs - proton.pos
rhat = r/mag(r)
Efield = oofpez*qe*rhat/(mag(r)**2)

Bfield = mzofp*qe*cross(velocity,that)/(mag(r)**2)

http://www.glowscript.org/docs/VPythonDocs/primitives.html http://vpython.org/contents/docs/shapes.html

@@ Line 16: / Line 16: @@
 [http://www.glowscript.org/docs/VPythonDocs/arrow.html Arrow]
-[[File:RedArrow.png|thumb|none|alt=Yellow Arrow|The example arrow]]
+[[File:RedArrow.png|thumb|none|alt=Yellow Arrow|Example arrow]]
 [http://www.glowscript.org/docs/VPythonDocs/box.html Box]
-[[File:OrangeBox.png|thumb|none|alt=Yellow Arrow|The example box]]
+[[File:OrangeBox.png|thumb|none|alt=Yellow Arrow|Example box]]
 [http://www.glowscript.org/docs/VPythonDocs/cone.html Cone]
-[[File:YellowCone.png|thumb|none|alt=Yellow Arrow|The example cone]]
+[[File:YellowCone.png|thumb|none|alt=Yellow Arrow|Example cone]]
 [http://www.glowscript.org/docs/VPythonDocs/curve.html Curve]
-[[File:GreenCurve.png|thumb|none|alt=Yellow Arrow|The example curve]]
+[[File:GreenCurve.png|thumb|none|alt=Yellow Arrow|Example curve]]
 [http://www.glowscript.org/docs/VPythonDocs/cylinder.html Cylinder]
-[[File:CyanCylinder.png|thumb|none|alt=Yellow Arrow|The example cylinder]]
+[[File:CyanCylinder.png|thumb|none|alt=Yellow Arrow|Example cylinder]]
 [http://www.glowscript.org/docs/VPythonDocs/ellipsoid.html Ellipsoid]
-[[File:BlueEllipsoid.png|thumb|none|alt=Yellow Arrow|The example ellipsoid]]
+[[File:BlueEllipsoid.png|thumb|none|alt=Yellow Arrow|Example ellipsoid]]
 [http://www.glowscript.org/docs/VPythonDocs/extrusion.html Extrusion]
-[[File:MagentaExtrusion.png|thumb|none|alt=Yellow Arrow|The example extrusion]]
+[[File:MagentaExtrusion.png|thumb|none|alt=Yellow Arrow|Example extrusion]]
 [http://www.glowscript.org/docs/VPythonDocs/helix.html Helix]
-[[File:GoldHelix.png|thumb|none|alt=Yellow Arrow|The example helix]]
+[[File:GoldHelix.png|thumb|none|alt=Yellow Arrow|Example helix]]
 [http://www.glowscript.org/docs/VPythonDocs/label.html Label]
-[[File:WhiteLabel.png|thumb|none|alt=Yellow Arrow|The example label]]
+[[File:WhiteLabel.png|thumb|none|alt=Yellow Arrow|Example label]]
 [http://www.glowscript.org/docs/VPythonDocs/points.html Points]
-[[File:IvoryPoints.png|thumb|none|alt=Yellow Arrow|The example points]]
+[[File:IvoryPoints.png|thumb|none|alt=Yellow Arrow|Example points]]
 [http://www.glowscript.org/docs/VPythonDocs/pyramid.html Pyramid]
-[[File:BrownPyramid.png|thumb|none|alt=Yellow Arrow|The example pyramid]]
+[[File:BrownPyramid.png|thumb|none|alt=Yellow Arrow|Example pyramid]]
 [http://www.glowscript.org/docs/VPythonDocs/ring.html Ring]
-[[File:AquaMarineRing.png|thumb|none|alt=Yellow Arrow|The example ring]]
+[[File:AquaMarineRing.png|thumb|none|alt=Yellow Arrow|Example ring]]
 [http://www.glowscript.org/docs/VPythonDocs/sphere.html Sphere]
-[[File:LightGreenSphere.png|thumb|none|alt=Yellow Arrow|The example sphere]]
+[[File:LightGreenSphere.png|thumb|none|alt=Yellow Arrow|Example sphere]]
 [http://www.glowscript.org/docs/VPythonDocs/text.html Text]
-[[File:KhakiText.png|thumb|none|alt=Yellow Arrow|The example text]]
+[[File:KhakiText.png|thumb|none|alt=Yellow Arrow|Example text]]
 ===Example Code of Each Objects ===
@@ Line 113: / Line 113: @@
 ===Sphere===
-The sphere object can be used to represent a wide variety of things, but perhaps the most important for use in Physics 2 is point charges and protons/electrons. Two things must be set; the position, a vector; and the radius, a numerical value.
+The sphere object can be used to represent a wide variety of things, but it is mostly used to represent spherical objects such as planets or particles such as protons and electrons. Two things must be set; the position (vector), and the radius (numerical value).
 ===Arrow===
-The arrow is perhaps the most important object for Physics 2. It can be used to represent Electric and magnetic fields as well as visualizing vectors. To create an arrow the position (a vector), axis (a vector), and the shaftwidth (a numerical value) must be set.
+The arrow is perhaps the most important object for Physics simulation. It can be used to represent various forces as well as visualizing vectors. To create an arrow the position (vector), axis (vector), and the shaftwidth (a numerical value) must be set.
 ==Object Uses==
-===Examples of Simple Objects===
+===VPython Syntax of each objects===
 <code>
 :sphere1 = sphere(pos=vector(4,8,15), radius=16)

VPython 3D Objects: Difference between revisions

Revision as of 21:47, 28 November 2017

Contents

List of 3D Objects

Image of Each Objects

Example Code of Each Objects

Commonly Used Objects

Sphere

Arrow

Object Uses

VPython Syntax of each objects

Modeling Fields

See also

Further reading

References

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