#!/usr/bin/env python
# coding: utf-8

# # three.js tests

# In[1]:


version()


# Test illustrating some opacity issues discussed in [#22408](https://trac.sagemath.org/ticket/22408):

# In[2]:


var('x y z a b')
E1 = x^2 + y^2 + z^2 - a^2 == 0
E2 = x^2 + y^2 - b^2*z^2 == 0
P1 = implicit_plot3d(E1.lhs().subs([a==2]),(x, -2, 2), (y, -2, 2), (z, -2, 2),
                     color="blue", opacity=0.5)
P2 = implicit_plot3d(E2.lhs().subs([b==1]),(x, -2, 2), (y, -2, 2), (z, -2, 2),
                     color="yellow", opacity=0.5)
P1 + P2


# In[3]:


polytopes.dodecahedron().plot(opacity=.5)


# Test of the option `single_side` introduced in [#28702](https://trac.sagemath.org/ticket/28702):

# In[4]:


polytopes.dodecahedron().plot(opacity=.5, single_side=True)


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