From 350a482b32512191596daad55104beec98af9981 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <jesse@jesterpm.net>
Date: Wed, 16 Feb 2011 08:12:56 +0000
Subject: Added alden's code, moved his objects into the object class and made
 them extend physical object. Fixed a node selection problem in TesseractUI.

---
 src/tesseract/objects/Polygon.java | 43 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 src/tesseract/objects/Polygon.java

(limited to 'src/tesseract/objects/Polygon.java')

diff --git a/src/tesseract/objects/Polygon.java b/src/tesseract/objects/Polygon.java
new file mode 100644
index 0000000..c8fcf53
--- /dev/null
+++ b/src/tesseract/objects/Polygon.java
@@ -0,0 +1,43 @@
+package tesseract.objects;
+import javax.media.j3d.Transform3D;
+import javax.vecmath.*;
+
+import alden.CollidableObject;
+
+public abstract class Polygon extends PhysicalObject {	
+	public Vector3f normal;
+	// Right-hand side of the plane equation: Ax + By + Cz = D
+	public float intercept;
+	
+	public Polygon(Vector3f position, Vector3f normal) {
+		this(1, position, normal);
+	}
+
+	public Polygon(float mass, Vector3f position, Vector3f normal) {
+		super(position, mass);
+		
+		this.normal = new Vector3f(normal);
+		this.normal.normalize();
+		intercept = this.normal.dot(position);
+		Vector3f newX = new Vector3f(1, 0, 0);
+		if (Math.abs(newX.dot(this.normal)) == 1)
+			newX = new Vector3f(0, -1, 0);
+		newX.scaleAdd(-newX.dot(this.normal), this.normal, newX);
+		newX.normalize();
+		Vector3f newZ = new Vector3f();
+		newZ.cross(newX, this.normal);
+		new Matrix4f(new Matrix3f(newX.x, this.normal.x, newZ.x, newX.y, this.normal.y, newZ.y, newX.z, this.normal.z, newZ.z), position, 1).get(orientation);
+	}
+
+	protected void updateTransformGroup() {
+		super.updateTransformGroup();
+		Transform3D tmp = new Transform3D();
+		TG.getTransform(tmp);
+		Matrix3f rot = new Matrix3f();
+		tmp.get(rot);
+		normal.x = rot.m01;
+		normal.y = rot.m11;
+		normal.z = rot.m21;
+		intercept = normal.dot(position);
+	}
+}
-- 
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