3 files changed, 22 insertions, 1 deletions
diff --git a/src/tesseract/objects/HalfSpace.java b/src/tesseract/objects/HalfSpace.java
new file mode 100644
index 0000000..df3f715
--- /dev/null
+++ b/src/tesseract/objects/HalfSpace.java
@@ -0,0 +1,17 @@
+package tesseract.objects;
+
+import javax.vecmath.Vector3f;
+
+public class HalfSpace extends PhysicalObject {
+	public Vector3f normal;
+	// Right-hand side of the plane equation: Ax + By + Cz = D
+	public float intercept;
+
+	public HalfSpace(Vector3f position, Vector3f normal) {
+		super(position, Float.POSITIVE_INFINITY);
+
+		this.normal = new Vector3f(normal);
+		this.normal.normalize();
+		this.intercept = this.normal.dot(position);
+	}
+}
diff --git a/src/tesseract/objects/PhysicalObject.java b/src/tesseract/objects/PhysicalObject.java
index 2634ca2..73e0c91 100644
--- a/src/tesseract/objects/PhysicalObject.java
+++ b/src/tesseract/objects/PhysicalObject.java
@@ -22,9 +22,12 @@ import com.sun.j3d.utils.geometry.Primitive;
  * @author Jesse Morgan
  */
 public class PhysicalObject extends CollidableObject {
+	protected boolean collidable;
+	
 	public PhysicalObject(final Vector3f thePosition, final float mass) {
 		super(mass);
 		this.position.set(thePosition);
+		collidable = true;
 	}
 
 	public List<PhysicalObject> spawnChildren(final float duration) {
@@ -67,7 +70,7 @@ public class PhysicalObject extends CollidableObject {
 	}
 
 	public void resolveCollisions(final PhysicalObject other) {
-		if (this.node != null && other.node != null) {
+		if (collidable && other.collidable) {
 			super.resolveCollisions(other);
 		}
 	}
diff --git a/src/tesseract/objects/emitters/ParticleEmitter.java b/src/tesseract/objects/emitters/ParticleEmitter.java
index 5aa391a..15c94a9 100644
--- a/src/tesseract/objects/emitters/ParticleEmitter.java
+++ b/src/tesseract/objects/emitters/ParticleEmitter.java
@@ -43,6 +43,7 @@ public class ParticleEmitter extends PhysicalObject {
 			final Color3f color) {
 		
 		super(position, Float.POSITIVE_INFINITY);
+		this.collidable = false;
 		
 		myCount = 0;
 		myFrequency = frequency;