It is very simple to use ruby syntax to create different views of a scene by changing the camera position, and use sunflow to render each image. Rather than modify each frame, I had the idea of using 20 incremental views, and crudely converting them to 200 frames by copying each view 10 times. I then used mencoder to stitch the frames together to produce a short movie. Here is the result:-
Changing the camera Sunflow Hair from monkstone on Vimeo.
# hair.rb NB: run this script directly with jruby
require 'library/sunflow_api/library/sunflow_api.jar'
require 'library/sunflow/library/sunflow.jar'
require 'library/sunflow/library/janino.jar'
require 'library/sunflow/library/commons-compiler.jar'
class BasicHair
API = Java::Com::briansteen::SunflowAPIAPI
SMath = Java::Org::sunflow::math
JColor = java.awt.Color
attr_reader :width, :height, :n_particles, :sunflow
def initialize width = 640, height = 480, cam_x = 0
@width = width
@height = height
@n_particles = 20
# create a new API instance
@sunflow = API.new
# set width and height
@sunflow.set_width(width)
@sunflow.set_height(height)
# set background color
@sunflow.set_background(1, 1, 1)
# set camera
@sunflow.set_camera_position(cam_x, 7, 5)
@sunflow.set_camera_target(2, 0.5, 0)
@sunflow.set_thinlens_camera("thinLensCamera", 50, width/height)
# set basic light
@sunflow.set_point_light("myPointLight", SMath::Point3.new(0, 5, 5),
JColor.new(255, 255, 255))
@sunflow.set_directional_light("myDirectionalLight", SMath::Point3.new(-2, 3, 0),
SMath::Vector3.new(0, 0, 0), 3, JColor.new(1, 1, 1))
# @sunflow.setSphereLight("mySphereLight", SMath::Point3.new(0, 30, -5),
# JColor.new(0, 0, 255), 32, 10)
# draw a ground plane
@sunflow.draw_plane("ground", SMath::Point3.new(0, 0, 0), SMath::Vector3.new(0, 1, 0))
# coordinates array
@sunflow.draw_box("boxname", 0, 0, 0, 1)
end
def create_scene
hair_widths = [0.025]
# create particle coordinates
350.times do |j|
# particle start position
particle_x = Math.cos(j * 0.5) * j * 0.0015
particle_y = 0
particle_z = Math.sin(j * 0.5) * j * 0.0015
hair_coordinates = Array.new(n_particles * 3)
array_index = -1
n_particles.times do |i|
particle_x += 0.1 + Math.cos(i * 0.15 + j * 0.05) * 0.13
particle_y -= Math.sin(particle_z * 0.01 + j * 0.05) * 0.125 +
Math.cos(i * 0.5 + particle_y) * 0.125
particle_z += Math.sin(i) * 0.25 + particle_y * 0.01
hair_coordinates[array_index += 1] = particle_x
hair_coordinates[array_index += 1] = particle_y
hair_coordinates[array_index += 1] = particle_z
end
# set ambient occlusion shader
@sunflow.setAmbientOcclusionShader("myAmbientOcclusionShader#{j}", JColor.new(55, 55, 55),
JColor.new(0, 0, 0), 16, 1)
# set glass shader
# @sunflow.setGlassShader("myGlassShader", JColor.new(1, 1, 1), 2.5, 3, JColor.new(1, 1, 1))
# set shiny-diffuse shader
# @sunflow.setShinyDiffuseShader("myShinyShader", JColor.new(55, 55, 55), 0.8)
# draw object
@sunflow.draw_hair("hair#{j}", n_particles - 2, hair_coordinates.to_java(:float),
hair_widths.to_java(:float))
end
end
def render_scene filename = nil
sunflow.setIrradianceCacheGIEngine(32, 0.4, 1, 15, nil)
# render
sunflow.render() unless filename
if filename
begin # test for dodgy filename/path
file = File.new(filename, "w")
file.close
sunflow.render(filename) # save as png image
rescue
puts "Warning #{filename} is not writable"
end
end
end
end
20.times do |i|
hair = BasicHair.new 640, 480, i # preferred render size for vimeo
hair.create_scene
hair.render_scene "/home/tux/ruby_sunflow/frame-#{i}.png" # default is to render in sunflow frame ie not to file
end
