vpython-object-list.md

3D objects

Sphere

• pos
• radius
• up
• axis
• color
• opacity
• make trail

Box

• pos
• size
• length
• width
• height
• color
• up
• make trail

Arrow

• pos
• color
• axis
• shaftwidth
• headwidth
• headlength
• make_trail

Cylinder

• pos
• axis
• radius
• length
• color
• up

Cone

• pos
• axis
• size
• color
• opacity
• shininess
• radius

Label

• pos
• text
• xoffset
• yoffset
• space
• height
• border
• font
• color
• background

Ring

• pos
• size
• axis
• color
• up
• visible
• radius
• thickness

Extrustion?

Curve ?

Pyramid

• pos
• size
• color

Other Objects

Vector

• created with vec()
• must be 3d
• element wise operations + and *
• doesn't work with +=, -=, *=, /=
• mag(A) = A.mag = |A|
• mag2(A) = A.mag2 = |A| * |A|
• norm(A) = A.norm = A / |A| a unit vector in the direction of A
• hat?
• dot(A, B) = A.dot(B) = A dot B the scalar dot product of between two vectors
• cross(A, B) = A.cross(B) the cross product between two vectors
• diff_angle(A, B) = A.diff_angle(B) The angle between two vectors in radians
• A.equals(B) is true if all elements of A equal B
• A.proj(B) = dot(A,norm(B))*norm(B), the vector projection of A along B
• A.comp(B) = dot(A,norm(B)), the scalar projection of A along B

Canvases

• Do we need controls to control Canvase?
• multiple scenes?
• camera positions
• Do we want people to be able to adjust scene width and height