Back to draw-VTK

# 'draw'-VTK interface:object vector

Once you have opened a Maxima session, load package draw and then set global variable draw_renderer to vtk:

load("draw") $draw_renderer: 'vtk$


To read the documentation on object vector, write the following sentence:

describe(vector) $ Two vectors: draw3d( color = yellow, head_length = 0.5, line_width = 0.1, vector([0,0,0],[1,0,0]), color = cyan, head_angle = 10, line_width = 0.03, vector([0,1,0],[-3,0,0]))$


Since we are using here option unit_vectors = true, all three vector are plotted with modulus one:

draw3d(
color = white,
explicit(x^2+y^2, x, -1, 0, y, -1, 1),

line_width   = 0.01,
unit_vectors = true,

color = yellow,
vector([0,0,0],[10,0,0]),
color = cyan,
vector([0,0,0],[0,7,0]),
color = red,
vector([0,0,0],[0,0,6]) )$ Two screenshots of a vector field. Function draw3d admits as arguments lists of options and objects: /* Define vector field */ coord: setify(makelist(k,k,1,5))$
points3d: listify(cartesian_product(coord,coord,coord))$vf3d(x,y,z):= vector([x,y,z],2*[sin(x),cos(y),log(z)])$

/*list of vector objects*/
vect3: makelist(vf3d(k[1],k[2],k[3]),k,points3d)$draw3d( [head_length = 0.2, line_width = 0.01, color = cyan, head_angle = 10, unit_vectors = true], vect3)$


A general view:

Zoom is provided by clicking with the mouse right button:

The colored arrows indicate the positive directions of the axes. In this example both the cone and the cylinder point to a common random direction:

d: [random(2.0)-1,random(2.0)-1,random(2.0)-1]$draw3d( head_length = 0.5, line_width = 0.1, capping = true, axis_3d = false, /* x- axis */ color = red, vector([-8,0,0],[16,0,0]), /* y- axis */ color = green, vector([0,-8,0],[0,16,0]), /* z- axis */ color = blue, vector([0,0,-8],[0,0,16]), color = white, cylinder([0,0,0],0.5,16,d), cone([0,0,0],3,5,d) )$