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maint: periodic merge of stable to default.
author Rik <octave@nomad.inbox5.com>
date Sun, 05 Feb 2012 15:32:24 -0800
parents 48cb466f1418 4d917a6a858b
children 5d3a684236b0
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1 ## Copyright (C) 2009-2012 Kai Habel
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} surfl (@var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} surfl (@var{z})
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22 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L})
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23 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L}, @var{P})
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24 ## @deftypefnx {Function File} {} surfl (@dots{}, "light")
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25 ## Plot a lighted surface given matrices @var{x}, and @var{y} from
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26 ## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
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27 ## @var{y} coordinates of the mesh. If @var{x} and @var{y} are vectors, then
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28 ## a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns
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29 ## of @var{z} correspond to different @var{x} values and rows of @var{z}
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30 ## correspond to different @var{y} values.
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31 ##
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32 ## The light direction can be specified using @var{L}. It can be given as a
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33 ## 2-element vector [azimuth, elevation] in degrees or as a 3-element vector
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34 ## [lx, ly, lz]. The default value is rotated 45 degrees counterclockwise
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35 ## from the current view.
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36 ##
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37 ## The material properties of the surface can specified using a 4-element vector
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38 ## @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
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39 ## @var{p} = [0.55 0.6 0.4 10].
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40 ##
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41 ## @table @asis
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42 ## @item "AM" strength of ambient light
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43 ##
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44 ## @item "D" strength of diffuse reflection
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45 ##
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46 ## @item "SP" strength of specular reflection
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47 ##
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48 ## @item "EXP" specular exponent
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49 ## @end table
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50 ##
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51 ## The default lighting mode "cdata", changes the cdata property to give the
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52 ## impression of a lighted surface. Please note: the alternative "light"
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53 ## mode, which creates a light object to illuminate the surface is not
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54 ## implemented (yet).
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55 ##
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56 ## Example:
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57 ##
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58 ## @example
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59 ## @group
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60 ## colormap (bone (64));
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61 ## surfl (peaks);
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62 ## shading interp;
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63 ## @end group
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64 ## @end example
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65 ## @seealso{surf, diffuse, specular, surface}
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66 ## @end deftypefn
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67
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68 ## Author: Kai Habel <kai.habel@gmx.de>
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69
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70 function retval = surfl (varargin)
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71
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72 [h, varargin] = __plt_get_axis_arg__ ("surfl", varargin{:});
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73
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74 oldh = gca ();
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75 unwind_protect
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76 axes (h);
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77 newplot ();
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78
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79 ## Check for lighting type.
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80 use_cdata = true;
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81 if (ischar (varargin{end}))
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82 lstr = tolower (varargin{end});
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83 if (strncmp (lstr, "light", 5))
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84 warning ("light method not supported (yet), using cdata method instead");
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85 ## This can be implemented when light objects are supported.
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86 use_cdata = false;
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87 elseif (strncmp (lstr, "cdata", 5))
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88 use_cdata = true;
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89 else
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90 error ("surfl: unknown lighting method");
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91 endif
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92 varargin(end) = [];
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93 endif
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94
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95 ## Check for reflection properties argument.
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96 ##
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97 ## r = [ambient light strength,
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98 ## diffuse reflection strength,
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99 ## specular reflection strength,
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100 ## specular shine]
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101 if (length (varargin{end}) == 4 && isnumeric (varargin{end}))
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102 r = varargin{end};
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103 varargin(end) = [];
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104 else
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105 ## Default values.
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106 r = [0.55, 0.6, 0.4, 10];
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107 endif
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108
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109 ## Check for light vector (lv) argument.
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110 have_lv = false;
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111 if (isnumeric (varargin{end}))
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112 len = numel (varargin{end});
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113 lastarg = varargin{end};
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114 if (len == 3)
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115 lv = lastarg;
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116 varargin(end) = [];
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117 have_lv = true;
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118 elseif (len == 2)
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119 [lv(1), lv(2), lv(3)] = sph2cart ((lastarg(1) - 90) * pi/180, lastarg(2) * pi/180, 1.0);
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120 varargin(end) = [];
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121 have_lv = true;
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122 endif
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123 endif
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124
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125 htmp = surface (varargin{:});
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126 if (! ishold ())
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127 set (h, "view", [-37.5, 30],
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128 "xgrid", "on", "ygrid", "on", "zgrid", "on", "clim", [0 1]);
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129 endif
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130
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131 ## Get view vector (vv).
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132 a = axis;
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133 [az, el] = view;
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134 [vv(1), vv(2), vv(3)] = sph2cart ((az - 90) * pi/180.0, el * pi/180.0, 1.0);
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135 vv /= norm (vv);
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136
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137 if (!have_lv)
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138 ## Calculate light vector (lv) from view vector.
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139 Phi = 45.0 / 180.0 * pi;
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140 R = [cos(Phi), -sin(Phi), 0;
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141 sin(Phi), cos(Phi), 0;
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142 0, 0, 1];
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143 lv = (R * vv.').';
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144 endif
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145
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146 vn = get (htmp, "vertexnormals");
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147 dar = get (h, "plotboxaspectratio");
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148 vn(:,:,1) *= dar(1);
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149 vn(:,:,2) *= dar(2);
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150 vn(:,:,3) *= dar(3);
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151
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152 ## Normalize vn.
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153 vn = vn ./ repmat (sqrt (sumsq (vn, 3)), [1, 1, 3]);
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154 [nr, nc] = size(get(htmp, "zdata"));
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155
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156 ## Ambient, diffuse, and specular term.
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157 cdata = (r(1) * ones (nr, nc)
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158 + r(2) * diffuse (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv)
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159 + r(3) * specular (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv, vv, r(4)));
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160
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161 set (htmp, "cdata", cdata ./ sum (r(1:3)));
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162
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163 unwind_protect_cleanup
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164 axes (oldh);
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165 end_unwind_protect
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166
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167 if (nargout > 0)
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168 retval = htmp;
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169 endif
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170
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171 endfunction
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172
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173
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174 %!demo
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175 %! clf;
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176 %! [X,Y,Z] = sombrero ();
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177 %! colormap (copper (64));
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178 %! surfl (X,Y,Z);
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179 %! shading interp;
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180
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181 %!demo
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182 %! clf;
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183 %! [X,Y,Z] = sombrero ();
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184 %! colormap (copper (64));
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185 %! [az, el] = view ();
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186 %! surfl (X,Y,Z, [az+225,el], [0.2 0.6 0.4 25]);
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187 %! shading interp;
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188