python - Pyglet vertex_list_indexed exception -

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i have class render coordinate axis in pyglet:

class axis(object):     def __init__(self,                  position=(0.0, 0.0, 0.0),                  x_color=(1.0, 0.0, 0.0),                  y_color=(0.0, 1.0, 0.0),                  z_color=(0.0, 0.0, 1.0),                  length=1.0):          self.position = list(position)          self.x_color = map(float, list(x_color))         self.y_color = map(float, list(y_color))         self.z_color = map(float, list(z_color))          self.length = float(length)          lines = (             0, 1,             0, 2,             0, 3         )          vertices = (             self.position[0], self.position[1], self.position[2],             self.length, 0.0, 0.0,             0.0, self.length, 0.0,             0.0, 0.0, self.length         )          colors = (             self.x_color[0], self.x_color[1], self.x_color[2],             self.y_color[0], self.y_color[1], self.y_color[2],             self.z_color[0], self.z_color[1], self.z_color[2]         )          self.vertex_list = pyglet.graphics.vertex_list_indexed(             len(vertices) / 3,             lines,             ('v3f', vertices),             ('c3f', colors),         )      def draw(self):         self.vertex_list.draw(gl_lines)

when use code in program exception:

traceback (most recent call last):   file "/home/linch/project/modelviewer/window.py", line 163, in <module>     window = modelviewerwindow()   file "/home/linch/project/modelviewer/window.py", line 79, in __init__     self.axis = axis()   file "/home/linch/project/modelviewer/window.py", line 47, in __init__     ('c4f', colors),   file "/usr/local/lib/python2.7/dist-packages/pyglet/graphics/__init__.py", line 301, in vertex_list_indexed     return _get_default_batch().add_indexed(count, 0, none, indices, *data)   file "/usr/local/lib/python2.7/dist-packages/pyglet/graphics/__init__.py", line 385, in add_indexed     vlist._set_attribute_data(i, array)   file "/usr/local/lib/python2.7/dist-packages/pyglet/graphics/vertexdomain.py", line 413, in _set_attribute_data     region.array[:] = data valueerror: can assign sequence of same size

if remove ('c3f', colors) works, without color. doing wrong?

you use 4 vertices, color array has 3 entries. sizes of arrays need match. need vertex each distinct combination of position , color. draw 3 lines in 3 different colors, need 6 vertices. fact 3 of them share same position doesn't make difference, because need vertices 3 different colors @ position.

also, if correctly understand you're trying do, vertex positions partly wrong. 2nd, 3rd, , 4th vertex relative 1st vertex, need absolute coordinates.

overall, these arrays should you're looking for:

vertices = (     self.position[0], self.position[1], self.position[2],     self.position[0] + self.length, self.position[1], self.position[2],     self.position[0], self.position[1], self.position[2],     self.position[0], self.position[1] + self.length, self.position[2],     self.position[0], self.position[1], self.position[2],     self.position[0], self.position[1], self.position[2] + self.length )  colors = (     self.x_color[0], self.x_color[1], self.x_color[2],     self.x_color[0], self.x_color[1], self.x_color[2],     self.y_color[0], self.y_color[1], self.y_color[2],     self.y_color[0], self.y_color[1], self.y_color[2],     self.z_color[0], self.z_color[1], self.z_color[2]     self.z_color[0], self.z_color[1], self.z_color[2] )

you need adjust index list accordingly match new vertex definitions:

lines = (     0, 1,     2, 3,     4, 5 )

however, since there's no opportunity share vertices, it's easier use non-indexed geometry in case.


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