wblut example

Author: monkstone

external_library/java/hemesh/triangulation_3d.rb

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+load_library :hemesh
+
+java_import 'wblut.geom.WB_Point'
+java_import 'wblut.geom.WB_RandomBox'
+java_import 'wblut.geom.WB_RandomPoint'
+java_import 'wblut.geom.WB_Triangulate'
+java_import 'wblut.geom.WB_Triangulation3D'
+java_import 'wblut.processing.WB_Render3D'
+
+attr_reader :source, :render, :numPoints, :tetrahedra, :points
+
+def setup
+  sketch_title 'Triangulation 3D'
+  ArcBall.init(self)
+  @source = WB_RandomBox.new.setSize(500, 500, 500)
+  @render = WB_Render3D.new(self)
+  numPoints = 100
+  @points = (0..numPoints).map { source.nextPoint }
+  triangulation = WB_Triangulate.triangulate3D(points)
+  @tetrahedra = triangulation.getTetrahedra() # 1D array of indices of tetrahedra, 4 indices per tetrahedron
+  puts("First tetrahedron: [ #{tetrahedra[0]}, #{tetrahedra[1]}, #{tetrahedra[2]}, #{tetrahedra[3]} ]")
+end
+
+def draw
+  background(55)
+  directional_light(255, 255, 255, 1, 1, -1)
+  directional_light(127, 127, 127, -1, -1, 1)
+  center = (0...tetrahedra.length).step(4) do |i|
+    push_matrix
+    center = WB_Point.new(
+      points[tetrahedra[i]]).addSelf(points[tetrahedra[i + 1]]).addSelf(points[tetrahedra[i + 2]]).addSelf(points[tetrahedra[i + 3]]).mulSelf(0.25 + 0.25 * sin(0.005 * frame_count)
+    )
+    render.translate(center)
+    render.drawTetrahedron(points[tetrahedra[i]], points[tetrahedra[i + 1]], points[tetrahedra[i + 2]], points[tetrahedra[i + 3]])
+    pop_matrix
+  end
+end
+
+def settings
+  size(1000, 1000, P3D)
+  smooth(8)
+end