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Hello everyone, I'm new to Povray, and enjoying all the math in it.
I would like to be able to apply a grid on a surface, similarly to this
image :
http://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Saddle_pt.jpg/600px-Saddle_pt.jpg
When trying, for example, a checkered texture, it is of course not uniform
in x and z directions (for example, on a plane parallel to the y axis, I
would expect not to see any grid lines perpendicular to the plane).
To explain another way, I would like to be able to project the grid (that is
on
the xz plane) onto the surface, perpendicularly to the plane (to be able to
see easily how the surface actually is)
Can anybody please give me a hand here ?
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Wasn't it Xedi who wrote:
>Hello everyone, I'm new to Povray, and enjoying all the math in it.
>I would like to be able to apply a grid on a surface, similarly to this
>image :
>http://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Saddle_pt.jpg/600px-
>Saddle_pt.jpg
That sort of grid, where the grid is fixed in space rather than
following the surface, is easy. Compare this to the wiki image
camera { location <4, 8, -4>*2 look_at <0, 0, 0> angle 10}
background {rgb 1}
light_source {<0,200,0> colour rgb 1}
#declare T1 = texture {
pigment {
gradient x
colour_map{[0.05 rgb 0]
[0.05 rgbt <1,1,1,1>]
[0.95 rgbt <1,1,1,1>]
[0.95 rgb 0]
}
}
scale 0.1
}
isosurface {
function { y+cos(x*pi)*0.2-cos(z*pi)*0.3} open
max_gradient 1.5
contained_by{box{ <-2,-0.6,-0.8><2,0.6,0.8>}}
texture{pigment {rgb .9*y}}
texture {T1}
texture {T1 rotate y*90}
texture {T1 rotate z*90 scale 2.1 translate y*0.1}
}
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