WorldViz User Forum - vertex list

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- Vizard (https://forum.worldviz.com/forumdisplay.php?f=17)

- - vertex list (https://forum.worldviz.com/showthread.php?t=2119)

Hi,

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:

Code:

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



roadarray[0] = x

roadarray[1] = y

roadarray[2] = z

                



viz.startlayer(viz.LINE_STRIP)

viz.linewidth(4)

viz.vertexcolor(0, 0.6, 0)

viz.vertex(roadarray[0],roadarray[1],roadarray[2])

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.

J

It looks like you are using the numpy.zeroes function incorrectly. I believe it should be:

Code:

roadarray = 0.0*np.zeros((201,3)) #Need the inner parentheses

Hi,

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
".

Code:



length = 200

viz.startlayer(viz.LINE_STRIP)

viz.vertexcolor(1,1,1)

viz.linewidth(5)

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

viz.vertex(roadarray[:length,0],roadarray[:length,1],roadarray[:length,2])

lines = viz.endlayer()

I'd be grateful for any advice on this, I'm not a python expert!

Best, j