sampling examples

Author: monkstone

external_library/java/PixelFlow/sampling_fibonacci.rb

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+# PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
+#
+# A Processing/Java library for high performance GPU-Computing (GLSL).
+# MIT License: https://opensource.org/licenses/MIT
+#
+load_library :PixelFlow
+java_import 'com.thomasdiewald.pixelflow.java.sampling.DwSampling'
+attr_reader :shp_samples, :sample_idx
+
+def settings
+  size(800, 800, P2D)
+  smooth(8)
+end
+
+def setup
+  sketch_title 'Sampling Fibonacci'
+  @sample_idx = 1
+  @shp_samples = create_shape(GROUP)
+  frame_rate(1_000)
+end
+
+def draw
+  background(64)
+  r = 0.01 * sample_idx**0.5
+  angle = sample_idx * DwSampling::GOLDEN_ANGLE_R
+  x = r * cos(angle)
+  y = r * sin(angle)
+  add_shape(Vec2D.new(x, y), 500)
+  translate(width / 2, height / 2)
+  shape(shp_samples)
+  @sample_idx += 1
+end
+
+def add_shape(position, scale)
+  pos = position * scale
+  shp_point = create_shape(POINT, pos.x, pos.y)
+  shp_point.set_stroke(color(255))
+  shp_point.set_stroke_weight(3)
+  shp_samples.add_child(shp_point)
+end

external_library/java/PixelFlow/sampling_halton.rb

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+# PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
+#
+# A Processing/Java library for high performance GPU-Computing (GLSL).
+# MIT License: https://opensource.org/licenses/MIT
+#
+load_library :PixelFlow
+java_import 'com.thomasdiewald.pixelflow.java.sampling.DwSampling'
+attr_reader :shp_samples, :sample_idx, :shp_gizmo
+
+def settings
+  size(800, 800, P3D)
+  smooth(8)
+end
+
+def setup
+  sketch_title 'Sampling Halton'
+  ArcBall.init(self)
+  @sample_idx = 1
+  @shp_samples = create_shape(GROUP)
+  frame_rate(1_000)
+end
+
+def draw
+  background(64)
+  display_gizmo(500)
+  sample = DwSampling::uniformSampleHemisphere_Halton(sample_idx)
+
+  add_shape(Vec3D.new(*sample), 400)
+  shape(shp_samples)
+  @sample_idx += 1
+end
+
+def add_shape(position, scale)
+  pos = position * scale
+  shp_point = create_shape(POINT, pos.x, pos.y, pos.z)
+  shp_point.set_stroke(color(255))
+  shp_point.set_stroke_weight(3)
+  shp_samples.add_child(shp_point)
+end
+
+def display_gizmo(s)
+  if(shp_gizmo.nil?)
+    stroke_weight(1)
+    @shp_gizmo = create_shape
+    shp_gizmo.begin_shape(LINES)
+    shp_gizmo.stroke(255,0,0)
+    shp_gizmo.vertex(0,0,0)
+    shp_gizmo.vertex(s,0,0)
+    shp_gizmo.stroke(0,255,0)
+    shp_gizmo.vertex(0,0,0)
+    shp_gizmo.vertex(0,s,0)
+    shp_gizmo.stroke(0,0,255)
+    shp_gizmo.vertex(0,0,0)
+    shp_gizmo.vertex(0,0,s)
+    shp_gizmo.end_shape
+  end
+  shape(shp_gizmo)
+end