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Old 06-30-2009, 03:54 AM
jaclyn.bill jaclyn.bill is offline
Join Date: Oct 2007
Posts: 42
vertex list


I'm trying to get vizard to draw a set of lines on a certain length along a ground plane which follow a curving path (essentially creating basic road markings).

I really want the lines to follow a set of vertex points set by

x = np.linspace(-np.pi, np.pi, length)
y = x, np.sin(x)
z = some constant

However, I can't seem to get these functions to work in vizard when I create an array:

roadarray = 0.0*np.zeros(201,3)

roadarray[0] = x
roadarray[1] = y
roadarray[2] = z

viz.vertexcolor(0, 0.6, 0)
lines = viz.endlayer()
Vizard is having problems reading "roadarray = 0.0*np.zeros(201,3)" (saying "TypeError: data type not understood") even though I can get this to create an array in python.

I'm sure this is a small error on my part, but if any one can point me in the right direction I would be grateful.

Many thanks.

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Old 06-30-2009, 09:27 AM
farshizzo farshizzo is offline
WorldViz Team Member
Join Date: Mar 2003
Posts: 2,849
It looks like you are using the numpy.zeroes function incorrectly. I believe it should be:
roadarray = 0.0*np.zeros((201,3)) #Need the inner parentheses
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Old 07-01-2009, 07:17 AM
jaclyn.bill jaclyn.bill is offline
Join Date: Oct 2007
Posts: 42

I'm sorry but I'm still having problems with this and can't understand why it won't read my array. It is giving the error "TypeError: x must be a float" if I try to convert x to a float (which I thought it already was) I get the error "TypeError: only length-1 arrays can be converted to Python scalars

length = 200
roadarray = 0.0*np.zeros((length,3))
x = np.linspace(-np.pi, np.pi, length)
z = np.sin(x)
roadarray[:length,0]= x
roadarray[:length,1]= 0
roadarray[:length,2]= z
lines = viz.endlayer()
I'd be grateful for any advice on this, I'm not a python expert!

Best, j
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