#16263: directional lighting in tachyon
-------------------------------------+-------------------------------------
Reporter: niles | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-6.3
Component: graphics | Resolution:
Keywords: tachyon | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/niles/16263 | Commit:
/tachyon-lights | 84d0b894e5f34347220672f465a02350a641b890
Dependencies: | Stopgaps:
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Changes (by niles):
* commit: => 84d0b894e5f34347220672f465a02350a641b890
* branch: => u/niles/16263/tachyon-lights
Comment:
I've done a little with this and then put it down; I'm attaching what I
have so it doesn't get lost. The basic functionality is there, but needs
to be documented.
At the moment, it's not clear that directional lights really produce
something drastically better than the standard trick of just putting a
light *really* far away. Here is some code I used for testing:
{{{
p = 3
q = 5
def K(s):
"""
a (p,q) torus knot
"""
var('t')
r = cos(q*t + s) + 2
x = fast_callable(r*cos(p*t + s),vars=[t])
y = fast_callable(r*sin(p*t + s) ,vars=[t])
z = fast_callable(-sin(q*t + s) ,vars=[t])
def func(t):
return (x(t),y(t),z(t))
return func
X = Tachyon(camera_center=(4,4,10))
X.texture('t')
X.texture('mirror', ambient=0.05, diffuse=0.05, specular=.9, opacity=0.9,
color=(.8,.8,.8))
X.texture('grey', color=(.8,.8,.8), texfunc=3)
X.parametric_plot(K(0),0,2*pi,'t',min_depth=6)
X.parametric_plot(K(pi/4),0,2*pi,'grey',min_depth=6)
X.parametric_plot(K(-pi/4),0,2*pi,'mirror',min_depth=6)
X.light((0,0,20),.5,(1,1,1)) # standard lights
X.light((-10,0,10),.5,(1,1,1))
Y = Tachyon(camera_center=(4,4,10))
Y.texture('t')
Y.texture('white',ambient=.8,diffuse=.8,specular=.1,color=(1,1,1))
Y.texture('mirror', ambient=0.05, diffuse=0.05, specular=.9, opacity=0.9,
color=(.8,.8,.8))
Y.texture('grey', color=(.8,.8,.8), texfunc=3)
Y.parametric_plot(K(0),0,2*pi,'t',min_depth=6)
Y.parametric_plot(K(pi/4),0,2*pi,'grey',min_depth=6)
Y.parametric_plot(K(-pi/4),0,2*pi,'mirror',min_depth=6)
Y.plane((0,0,-20),(0,0,1),'white')
Y.light((0,0,1),.5,(1,1,1),'directional') # directional lights
Y.light((-1,1,0),.5,(1,1,1),'directional')
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/16263#comment:2>
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