This document discusses using Scala and the Lightweight Java Game Library (LWJGL) to create 3D graphics applications. It provides an overview of Scala and LWJGL, describes how to load and parse MikuMikuDance (MMD) model files in Scala, and mentions using the JBullet physics engine for inverse kinematics (IK) simulations.

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Scala LWJGL
3D
@chimerast

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n Twitter: @chimerast
n Blog: http://chimera.st/
n Scala : 1
n LWJGL : 3
n NEET
n Web/
n Seasar Foundation S2Wicket 1.4
n wicket-ja, java-ja
n 3D
n 3D
n DirectX7 Immediate Mode

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Scala 3D
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n 3D (or )
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n MikuMikuDance 3D
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n Scala
n LWJGL
n Slick

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MikuMikuDance
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n http://www.geocities.jp/higuchuu4/
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n DirectX
http://www.nicovideo.jp/watch/sm9647253
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n JVM

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Scala
A Scalable Language
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n Java 1
n 3D
scala> List(3,2,5,1).reduceLeft(math.max)
res0: Int = 5
n Java
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LWJGL
Lightweight Java Game Library
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n http://www.lwjgl.org/
n OpenGL
n 3D API
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n OpenAL
n 3D API
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n OpenCL
n GPGPU GPU API
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Slick
2D Game Library based on LWJGL
n LWJGL 2D
n http://slick.cokeandcode.com/
n LWJGL(OpenGL) 2D
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n 2D
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n SVG

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LWJGL
n https://github.com/chimerast/scala-lwjgl-sample
n sbt
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n 3D
n 3D
n LWJGL native java.library.path
n sbt fork

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n 3D
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n IK ( )
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n
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n 60fps(1 60 )
n 16ms

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Java/Scala
n (GC)
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n C++
n JIT C++ JIT
n SIMD C+
+
n SIMD 1CPU
n 10
n 3D

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n
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n Array[Float]
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n Scala immutable.List
n GC
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n Java
n OpenGL GPU
n GPU SIMD
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Scala
:
.apply
.update
.foreach
.prepend
.append
.insert
java.util.ArrayList[AnyRef]
11
19
16
19,746
158
39,317
java.util.LinkedList[AnyRef]
38.622
388,877
43
152
141
320
Array[AnyRef]
1
21
174
-
-
-
mutable.ArrayBuffer[AnyRef]
11
19
122
19,734
172
40,118
mutable.ListBuffer[AnyRef]
94,595
94,861
367
119
170
95,643
mutable.Queue[AnyRef]
99.916
100,672
497
142
230
-
immutable.List[AnyRef]
94,543
4,718,559
312
175
2,482,455
-
immutable.Vector[AnyRef]
107
517
211
779
662
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Scala
http://d.hatena.ne.jp/chimerast/20110304/1299237142
Array[AnyRef].apply JIT (DCE)
JIT

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MikuMikuDance
n PMD (.pmd)
n 3D
n VMD (.vmd)
n 3D
n 2ch
n - MMD (PMD)
http://bit.ly/fFYlS
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n AS3 (b2ox ): http://www.libspark.org/browser/as3/FLARMMD
n XNA (wilfrem ): http://sourceforge.jp/projects/mmdx/

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PMD
n in MMD
n 3D
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n IK
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n Direct3D OpenGL
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n OpenGL DirectX
n z

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VMD
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in Scala
val file = new File(path)
using(new RandomAccessFile(file, "r")) { f =>
val channel = f.getChannel
val buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size)
buffer.order(ByteOrder.LITTLE_ENDIAN)
Some(new PMDModel(file, buffer))
}
class PMDModel(file: File, buffer: ByteBuffer) {
val header = new PMDHeader(buffer)
val vertices = Array.fill(buffer.getInt) { new PMDVertex(buffer) }
val indices = Array.fill(buffer.getInt) { buffer.getShort }
val materials = Array.fill(buffer.getInt) { new PMDMaterial(buffer) }
val bones = Array.fill(buffer.getShort) { new PMDBone(buffer) }
val iks = Array.fill(buffer.getShort) { new PMDIKData(buffer) }
val skins = Array.fill(buffer.getShort) { new PMDSkinData(buffer) }
val skinIndex = Array.fill(buffer.get) { buffer.getShort }
val boneDispName = Array.fill(buffer.get) { buffer.getString(50) }
val boneDisp = Array.fill(buffer.getInt) { new PMDBoneDisp(buffer) }
}

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n IK
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n JBullet: http://jbullet.advel.cz/
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n Prolog =

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