Question

sizeref中属性plotly.graph_objs._cone.py的文档字符串说：

        Adjusts the cone size scaling. The size of the cones is
        determined by their u/v/w norm multiplied a factor and
        `sizeref`. This factor (computed internally) corresponds to the
        minimum "time" to travel across two successive x/y/z positions
        at the average velocity of those two successive positions. All
        cones in a given trace use the same factor. With `sizemode` set
        to "scaled", `sizeref` is unitless, its default value is 0.5
        With `sizemode` set to "absolute", `sizeref` has the same units
        as the u/v/w vector field, its the default value is half the
        sample's maximum vector norm.

        The 'sizeref' property is a number and may be specified as:
          - An int or float in the interval [0, inf]

        Returns
        -------
        int|float

在哪里计算出这个神秘的因素，而对于我来说，我找不到在哪里真正计算出它。由于我不了解这个奇怪的因素是如何计算的，因此我在动画中得到了非常奇怪的行为，如下所示：

import numpy as np
import plotly.graph_objs as go
import plotly.offline as pl

###np.around used because plotly.js doesn't like full precision float64s
t = np.linspace(0,2*np.pi,100)
x = np.around(np.vstack((np.cos(t), np.cos(t+np.pi))),decimals=6)
y = np.around(np.vstack((np.sin(t), np.sin(t+np.pi))),decimals=6)
z = np.around(np.vstack((np.ones(len(t)),np.ones(len(t)))),decimals=6)

v = np.around(np.vstack((np.cos(t), np.cos(t+np.pi))),decimals=6)
u = np.around(-np.vstack((np.sin(t), np.sin(t+np.pi))),decimals=6)
w = np.around(np.vstack((np.zeros(len(t)),np.ones(len(t)))),decimals=6)

fig3=go.Figure([dict(anchor="cm",showscale=False,sizemode="scaled",type="cone",x=x[:,0],y=y[:,0]
                                        ,z=z[:,0]
                                        ,u=u[:,0],v=v[:,0]
                                        ,w=w[:,0])],layout=go.Layout(
    scene=dict(aspectratio=dict(x=1,y=1,z=0.25),
                    xaxis=dict(range=[-2,2], tickmode="linear"),
                    yaxis=dict(range=[-2,2], tickmode="linear"),
                    zaxis=dict(range=[0,5]))))

fig3.frames= [go.Frame(data=[dict(type="cone",x=x[:,i],y=y[:,i],z=z[:,i],u=u[:,i],v=v[:,i],w=w[:,i])], 
                             layout=go.Layout(annotations=[dict(text="frame {}".format(i))]))for i in np.array(range(len(t)))]

pl.plot(fig3, animation_opts="{frame: {duration: 1}}")

请注意，由于正式版本尚不支持animation_opts（my repo），因此您必须先从see the issue I raised here移除animation_opts kwarg或使用plotly。

该因子在哪里计算？我已经搜索过代码，但一无所获。预先感谢！

P.S是的，我提供了很多无关的信息。我还没有看到在plotly中制作3D圆锥动画的示例，所以我想提供一个例子，我在plotly.py中的动画界面上工作，这肯定对某人有用！

编辑：请参见此issue on github

Answer 1

发现Plotly.js中存在一个内部缩放因子，导致了这一混乱。我已在我的当前回购版本的密谋here中修复了此问题。

可变动画速度的3D动画圆锥图中的圆锥大小

1 个答案: