# HEC From Network

Here we translate yet another hemesh processing sketch to JRubyArt.

### HEC From Network (hemesh example)

```
load_library :hemesh
java_import 'wblut.processing.WB_Render'
include_package 'wblut.hemesh'
include_package 'wblut.geom'
attr_reader :mesh, :render
def setup
sketch_title 'HEC From Network'
# Creates a mesh from a frame. A WB_Frame is a collection of points and a
# list of indexed connections.
ArcBall.init(self)
# Array of all points
vertices = []
grid(41, 41) do |i, j|
vertices << [-400 + i * 20.0, -400 + j * 20.0, sin(TWO_PI / 30 * i) * 40 + cos(TWO_PI / 25 * j) * 40]
end
# network = WB_Network.new(vertices)
# For more control add the nodes one by one, a value can be given to each node for future use.
network = WB_Network.new
vertices.each_with_index do |vertex, i|
# compromise on 2D noise for simplicity
network.addNode(vertex[0], vertex[1], vertex[2], noise(0.1 * i, 0.1 * i))
end
grid(40, 40) do |i, j|
network.addConnection(i + 41 * j, i + 1 + 41 * j) if rand(100) > 30
network.addConnection(i + 41 * j, i + 41 * (j + 1)) if rand(100) > 30
end
# If the connections are known in advance these can be given as parameter as int[][].
# The second index gives index of first and second point of connection in the points
# array. network = WB_Network.new(vertices, connections)
creator = HEC_FromNetwork.new
creator.setNetwork(network)
# alternatively you can specify a HE_Mesh instead of a WB_Network.
creator.setConnectionRadius(6) # connection radius
# number of faces in the connections, min 3, max whatever blows up the CPU
creator.setConnectionFacets(6)
# rotate the connections by a fraction of a facet. 0 is no rotation, 1 is a rotation over a full facet. More noticeable for low number of facets.
creator.setAngleOffset(0.25)
# Threshold angle to include sphere in joint.
creator.setMinimumBalljointAngle(TWO_PI / 3.0)
# divide connection into equal parts if larger than maximum length.
creator.setMaximumConnectionLength(30)
creator.setCap(true) # cap open endpoints of connections?
creator.setTaper(true) # allow connections to have different radii at each end?
creator.setCreateIsolatedNodes(false) # create spheres for isolated points?
# use the value of the WB_Node as scaling factor, only useful if the frame was created using addNode.
creator.setUseNodeValues(true)
@mesh = HE_Mesh.new(creator)
HET_Diagnosis.validate(mesh)
@render = WB_Render.new(self)
end
def draw
background(55)
lights
no_stroke
render.draw_faces(mesh)
stroke(0)
render.draw_edges(mesh)
end
def settings
size(1000, 1000, P3D)
smooth(8)
end
```

The hemesh library is developed by Frederik Vanhoutte