From 354041e8d61571b25c6eeb672537a013d3e0fa60 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <jesse@jesterpm.net>
Date: Fri, 11 Feb 2011 18:53:32 +0000
Subject: Broke the grabbing code but added Alden's collision code. Not sure if
 its working yet since my Mac doesn't like it.

---
 src/alden/HalfSpace.java | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/alden/HalfSpace.java

(limited to 'src/alden/HalfSpace.java')

diff --git a/src/alden/HalfSpace.java b/src/alden/HalfSpace.java
new file mode 100644
index 0000000..efab5ea
--- /dev/null
+++ b/src/alden/HalfSpace.java
@@ -0,0 +1,28 @@
+package alden;
+import javax.media.j3d.*;
+import javax.vecmath.*;
+
+@SuppressWarnings("restriction")
+public class HalfSpace extends CollidableObject {
+	protected Vector3f normal;
+	// Right-hand side of the plane equation: Ax + By + Cz = D
+	protected float intercept;
+
+	public HalfSpace(Vector3f position, Vector3f normal) {
+		super(Float.POSITIVE_INFINITY);
+		this.position.set(position);
+		this.normal = new Vector3f(normal);
+		this.normal.normalize();
+		intercept = this.normal.dot(position);
+	}
+
+/*	public CollisionInfo calculateCollision(Particle particle) {
+		if (Math.signum(normal.dot(particle.getPosition()) - intercept) == Math.signum(normal.dot(particle.getPreviousPosition()) - intercept))
+			return null;
+		
+		Vector3f projection = new Vector3f();
+		projection.scaleAdd(-1, position, particle.getPosition());
+		float penetration = -projection.dot(normal);
+		return new CollisionInfo(normal, penetration);
+	}*/
+}
-- 
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