add media demo

Author: monkstone

docs/_posts/2017-01-06-media.md

@@ -0,0 +1,101 @@
+---
+layout: post
+title:  "Media Demo"
+date:   2017-01-08 04:31:13
+categories: joonsrenderer update
+---
+Sunflow is an open source global illumination rendering system written in Java written by [Christopher Kulla][fpsunflower]. I have recently updated to [build with maven][maven] using jdk-8 and to use the latest [janino jars][janino]. This is gem makes sunflow rendering easily available to `JRubyArt` and `propane` users using Joon Hylub Lees [joons-renderer][joons]:-
+
+### media_demo.rb (JRubyArt Sketch)
+```ruby
+require 'joonsrenderer'
+include_package 'joons'
+
+attr_reader :jr, :eye, :center, :up
+
+def setup
+  sketch_title 'Media Demo'
+  @jr = JoonsRenderer.new(self)
+  jr.set_sampler('ipr') # Rendering mode, either 'ipr' or 'bucket'.
+  jr.set_size_multiplier(2) # Set size of PNG file as a multiple of Processing sketch size.
+  jr.setAA(-2, 0) # Set anti aliasing, (aaMin, aaMax, aaSamples). aaMin & aaMax = .. -2, -1, .. , 1, 2 .. aaMin < aaMax.
+  jr.set_caustics(10) # Set caustics. 1, 5, 10 .., affects quality of light reflected & refracted through glass.
+  # Camera Setting.
+  @eye = Vec3D.new(0, 0, 120)
+  @center = Vec3D.new(0, 0, -1)
+  @up = Vec3D.new(0, 1, 0)
+end
+
+def draw
+  jr.begin_record # Make sure to include things you want rendered.
+  kamera(eye: eye, center: center, up: up)
+  perspektiv(fov: PI / 4.0, aspect_ratio: 4 / 3.0, near_z: 5, far_z: 10_000)
+  jr.background('gi_instant') # Global illumination.
+  jr.background('cornell_box', 100, 100, 100) # Cornell box, width, height, depth.
+  push_matrix
+  translate(-40, 20, -20)
+  push_matrix
+  rotateY(-PI / 8)
+  # jr.fill('light', r, g, b)
+  jr.fill('light', 5, 5, 5)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('mirror', r, g, b)
+  jr.fill('mirror', 255, 255, 255)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('diffuse', r, g, b)
+  jr.fill('diffuse', 150, 255, 255)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('shiny', r, g, b, shininess)
+  jr.fill('shiny', 150, 255, 255, 0.1)
+  sphere(13)
+  translate(27, 0, 0)
+  pop_matrix
+  rotateY(PI / 8)
+  translate(-10, -27, 30)
+  # jr.fill('ambient occlusion', bright r, g, b, dark r, g, b, maximum distance, int samples)
+  jr.fill('ambient_occlusion', 150, 255, 255, 0, 0, 255, 50, 16)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('phong', r, g, b)
+  jr.fill('phong', 150, 255, 255)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('glass', r, g, b)
+  jr.fill('glass', 255, 255, 255)
+  sphere(13)
+  translate(27, 0, 0)
+  # jr.fill('constant', r, g, b)
+  jr.fill('constant', 150, 255, 255)
+  sphere(13)
+  pop_matrix
+  jr.end_record # Make sure to end record.
+  # Display rendered image if render is completed, and the argument is true.
+  jr.display_rendered(true)
+end
+
+def key_pressed
+  jr.render if (key == 'r' || key == 'R')  # Press 'r' key to start rendering.
+end
+
+def settings
+  size(800, 600, P3D)
+end
+
+```
+
+### The Processing Sketch
+
+<img src="{{site.github.url}}/assets/media_captured.png" />
+
+### The RayTraced Image
+
+<img src="{{site.github.url}}/assets/media_rendered.png" />
+
+[fpsunflower]:http://sunflow.sourceforge.net/
+[maven]:https://github.com/monkstone/sunflow
+[joons]:https://github.com/joonhyublee/joons-renderer
+[janino]:http://janino-compiler.github.io/janino/
+[github]:https://github.com/monkstone/joonsrenderer