another toxiclibs example

Author: monkstone

external_library/gem/toxiclibs/volume_utils/volumetric_cup.rb

@@ -0,0 +1,138 @@
+
+#
+# <p>NoiseSurface demo showing how to utilize the IsoSurface class to efficiently
+# visualise volumetric data, in this case using 3D SimplexNoise. The demo also
+# shows how to save the generated mesh as binary STL file (or alternatively in
+# OBJ format) for later use in other 3D tools/digital fabrication.</p>
+#
+# <p>Further classes for the toxi.volume package are planned to easier draw
+# and manipulate volumetric data.</p>
+#
+# <p>Key controls:</p>
+# <ul>
+# <li>w : toggle rendering style between shaded/wireframe</li>
+# <li>s : save model as STL & quit</li>
+# <li>1-9 : adjust brush density</li>
+# <li>a-z : adjust density threshold for calculating surface</li>
+# <li>-/= : adjust zoom</li>
+# </ul>
+#
+# Copyright (c) 2009 Karsten Schmidt
+#
+# This demo & library is free software you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# http:#creativecommons.org/licenses/LGPL/2.1/
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+require 'toxiclibs'
+include_package 'toxi.math.waves' # for SineWave
+
+DIMX = 96
+DIMY = 96
+DIMZ = 128
+NS = 0.03
+SCALE = TVec3D.new(256, 256, 384)
+Z_STEP = 0.005
+
+attr_reader :gfx, :do_save, :mesh, :isurface, :volume, :brush, :brush_size
+attr_reader :iso_threshold, :curr_scale, :density, :spin, :curr_z
+
+def settings
+  size(1024, 768, P3D)
+end
+
+def setup
+  sketch_title 'Volumetric Cup'
+  @isWireframe = false
+  @do_save = false
+  @gfx = Gfx::ToxiclibsSupport.new(self)
+  stroke_weight(0.5)
+  @volume = VolumetricSpaceArray.new(SCALE, DIMX, DIMY, DIMZ)
+  @brush = RoundBrush.new(volume, SCALE.x / 2)
+  @brush_size = SineWave.new(
+    -HALF_PI,
+    2 * TWO_PI * Z_STEP,
+    SCALE.x * 0.03,
+    SCALE.x * 0.06
+  )
+  @isurface = ArrayIsoSurface.new(volume)
+  @mesh = TriangleMesh.new
+  @iso_threshold = 0.1
+  @curr_scale = 1
+  @density = 0.5
+  @spin = 8
+  @curr_z = 0
+end
+
+def draw
+  brush.setSize(brush_size.update)
+  offsetZ = -SCALE.z + curr_z * SCALE.z * 2.6666
+  curr_radius = SCALE.x * 0.4 * sin(curr_z * PI)
+  (0..TWO_PI).step(PI / 2) do |t|
+    brush.drawAtAbsolutePos(
+      TVec3D.new(
+        curr_radius * cos(t + curr_z * spin),
+        curr_radius * sin(t + curr_z * spin),
+        offsetZ
+      ),
+      density
+    )
+    brush.drawAtAbsolutePos(
+      TVec3D.new(
+        curr_radius * cos(t - curr_z * spin),
+        curr_radius * sin(t - curr_z * spin),
+        offsetZ
+      ),
+      density
+    )
+  end
+  @curr_z += Z_STEP
+  volume.close_sides
+  isurface.reset
+  isurface.computeSurfaceMesh(mesh, iso_threshold)
+  if do_save
+    # save mesh as STL or OBJ file
+    mesh.saveAsSTL(data_path(format('cup%d.stl', millis / 1_000 )))
+    @do_save = false
+    exit
+  end
+  background(128)
+  translate(width / 2, height / 2, 0)
+  light_specular(230, 230, 230)
+  directional_light(255, 255, 255, 1, 1, -1)
+  shininess(1.0)
+  rotate_x(-0.4)
+  rotate_y(frame_count*0.05)
+  scale(curr_scale)
+  no_stroke
+  gfx.mesh(mesh)
+end
+
+def key_pressed
+  case key
+  when '-'
+    @curr_scale = max([curr_scale - 0.1, 0.5])
+  when '='
+    @curr_scale = min([curr_scale + 0.1, 10])
+  when 's'
+    @do_save = true
+  when '1'..'9'
+    density = -0.5 + (key.to_i) * 0.1
+    puts density
+  when '0'
+    @density = 0.5
+  when 'a'..'z'
+    @iso_threshold = (key.ord - 'a'.ord) * 0.019 + 0.01
+  end
+end