Texture Support

This module provides texture/material support for 3D Graphics objects and plotting. This is a very rough common interface for Tachyon, x3d, and obj (mtl). See Texture for full details about options and use.

Initially, we have no textures set:

sage: sage.plot.plot3d.base.Graphics3d().texture_set()
set()

However, one can access these textures in the following manner:

sage: G = tetrahedron(color='red') + tetrahedron(color='yellow') + tetrahedron(color='red', opacity=0.5)
sage: [t for t in G.texture_set() if t.color == colors.red] # we should have two red textures
[Texture(texture..., red, ff0000), Texture(texture..., red, ff0000)]
sage: [t for t in G.texture_set() if t.color == colors.yellow] # ...and one yellow
[Texture(texture..., yellow, ffff00)]

And the Texture objects keep track of all their data:

sage: T = tetrahedron(color='red', opacity=0.5)
sage: t = T.get_texture()
sage: t.opacity
0.5
sage: T # should be translucent
Graphics3d Object

AUTHOR:

  • Robert Bradshaw (2007-07-07) Initial version.

class sage.plot.plot3d.texture.Texture(id, color=(0.4, 0.4, 1), opacity=1, ambient=0.5, diffuse=1, specular=0, shininess=1, name=None, **kwds)

Bases: sage.misc.fast_methods.WithEqualityById, sage.structure.sage_object.SageObject

Class representing a texture.

See documentation of Texture.__classcall__ for more details and examples.

EXAMPLES:

We create a translucent texture:

sage: from sage.plot.plot3d.texture import Texture
sage: t = Texture(opacity=0.6)
sage: t
Texture(texture..., 6666ff)
sage: t.opacity
0.6
sage: t.jmol_str('obj')
'color obj translucent 0.4 [102,102,255]'
sage: t.mtl_str()
'newmtl texture...\nKa 0.2 0.2 0.5\nKd 0.4 0.4 1.0\nKs 0.0 0.0 0.0\nillum 1\nNs 1.0\nd 0.6'
sage: t.x3d_str()
"<Appearance><Material diffuseColor='0.4 0.4 1.0' shininess='1.0' specularColor='0.0 0.0 0.0'/></Appearance>"
hex_rgb()

EXAMPLES:

sage: from sage.plot.plot3d.texture import Texture
sage: Texture('red').hex_rgb()
'ff0000'
sage: Texture((1, .5, 0)).hex_rgb()
'ff7f00'
jmol_str(obj)

Convert Texture object to string suitable for Jmol applet.

INPUT:

  • obj - str

EXAMPLES:

sage: from sage.plot.plot3d.texture import Texture
sage: t = Texture(opacity=0.6)
sage: t.jmol_str('obj')
'color obj translucent 0.4 [102,102,255]'
sage: sum([dodecahedron(center=[2.5*x, 0, 0], color=(1, 0, 0, x/10)) for x in range(11)]).show(aspect_ratio=[1,1,1], frame=False, zoom=2)
mtl_str()

Convert Texture object to string suitable for mtl output.

EXAMPLES:

sage: from sage.plot.plot3d.texture import Texture
sage: t = Texture(opacity=0.6)
sage: t.mtl_str()
'newmtl texture...\nKa 0.2 0.2 0.5\nKd 0.4 0.4 1.0\nKs 0.0 0.0 0.0\nillum 1\nNs 1.0\nd 0.6'
tachyon_str()

Convert Texture object to string suitable for Tachyon ray tracer.

EXAMPLES:

sage: from sage.plot.plot3d.texture import Texture
sage: t = Texture(opacity=0.6)
sage: t.tachyon_str()
'Texdef texture...\n  Ambient 0.3333333333333333 Diffuse 0.6666666666666666 Specular 0.0 Opacity 0.6\n   Color 0.4 0.4 1.0\n   TexFunc 0'
x3d_str()

Convert Texture object to string suitable for x3d.

EXAMPLES:

sage: from sage.plot.plot3d.texture import Texture
sage: t = Texture(opacity=0.6)
sage: t.x3d_str()
"<Appearance><Material diffuseColor='0.4 0.4 1.0' shininess='1.0' specularColor='0.0 0.0 0.0'/></Appearance>"
sage.plot.plot3d.texture.is_Texture(x)

Deprecated. Use isinstance(x, Texture) instead.

EXAMPLES:

sage: from sage.plot.plot3d.texture import is_Texture, Texture
sage: t = Texture(0.5)
sage: is_Texture(t)
doctest:...: DeprecationWarning: Please use isinstance(x, Texture)
See https://trac.sagemath.org/27593 for details.
True
sage.plot.plot3d.texture.parse_color(info, base=None)

Parse the color.

It transforms a valid color string into a color object and a color object into an RBG tuple of length 3. Otherwise, it multiplies the info by the base color.

INPUT:

  • info - color, valid color str or number

  • base - tuple of length 3 (optional, default: None)

OUTPUT:

A tuple or color.

EXAMPLES:

From a color:

sage: from sage.plot.plot3d.texture import parse_color
sage: c = Color('red')
sage: parse_color(c)
(1.0, 0.0, 0.0)

From a valid color str:

sage: parse_color('red')
RGB color (1.0, 0.0, 0.0)
sage: parse_color('#ff0000')
RGB color (1.0, 0.0, 0.0)

From a non valid color str:

sage: parse_color('redd')
Traceback (most recent call last):
...
ValueError: unknown color 'redd'

From an info and a base:

sage: opacity = 10
sage: parse_color(opacity, base=(.2,.3,.4))
(2.0, 3.0, 4.0)