animation from rayracing

docs/_posts/2017-01-08-animated_ray_tracing.md

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+---
+layout: post
+title:  "Animation using raytraced images"
+date:   2017-01-08 05:31:13
+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]:-
+
+### test.rb (JRubyArt Sketch)
+```ruby
+load_library :joonsrenderer
+include_package 'joons'
+
+attr_reader :jr, :eye, :center, :up, :count, :radius, :file_name
+
+def settings
+  size(800, 600, P3D)
+end
+
+def setup
+  sketch_title 'Animation'
+  @file_name = 'Animation'
+  @jr = JoonsRenderer.new(self)
+  # Camera Setting.
+  @eye = Vec3D.new(0, 0, 120)
+  @center = Vec3D.new(0, 0, -1)
+  @up = Vec3D.new(0, 1, 0)
+  @count = 0
+  @radius = 35
+end
+
+def draw
+  jr.render # The draw loop that comes next is rendered
+  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('cornell_box', 100, 100, 100) # Cornell Box: width, height, depth.
+  jr.background('gi_ambient_occlusion') # Global illumination.
+  # Sun.
+  translate(0, -15, 0)
+  jr.fill('light', 1, 60, 60)
+  sphere(5)
+  # Planet, revolving at +3 degrees per frame.
+  translate(radius * DegLut.cos(count * 3), 0, radius * DegLut.sin(count * 3))
+  jr.fill('mirror')
+  sphere(5)
+  jr.end_record # Make sure to end record.
+  # Display rendered image if render is completed, and the argument is true.
+  jr.display_rendered(true)
+  save_frame(format("%s%s", file_name, "_###.png"))
+  @count += 1
+  no_loop if (count > 120)
+end
+
+```
+
+### The Animated Ray Trace Sketch
+Now you hava a bunch of `*.png` images that you need to zip up to create a video
+
+```bash
+png2yuv -j Animation_%0.3d.png -f 25 -I p -b 1 > tmp.yuv # zip it all up
+ffmpeg2theora --optimize --videobitrate 16778 -o Animation.ogv tmp.yuv # convert
+```
+
+<video src="/assets/Animation.ogv" poster="/assets/Animation.png" width="800" height="600" controls preload></video>
+
+
+ [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