fix soft_body

Author: monkstone

samples/processing_app/library/vecmath/vec2d/soft_body.rb

@@ -3,6 +3,7 @@
 # Softbody dynamic simulation using curve_vertex
 # and curve_tightness (and new Vec2D to_curve_vertex)
 ########
+load_libraries :vecmath, :fastmath
 
 attr_reader :accel, :center, :frequency, :radius, :rot_angle
 attr_reader :organic_constant, :nodes, :renderer, :angle, :node_start
@@ -13,12 +14,12 @@
 def setup
   size 640, 360
   @renderer = AppRender.new(self)
-  init
+  init_nodes
   no_stroke
   frame_rate 30
 end
 
-def init
+def init_nodes
   @accel = Vec2D.new
   @center = Vec2D.new(width / 2, height / 2)
   @radius = 45