What am I missing here (triangle list)

Troubleshooting graphics
1

I'm wanting to create a simple  model in code for experimentation so I'm looking at the box class to see how it does it.  After some math to calculate where the 8 corners are we get this:


   private void setVertexData() {
        TriangleBatch batch = getBatch(0);
        batch.setVertexBuffer(BufferUtils.createVector3Buffer(batch.getVertexBuffer(), 24));
       batch.setVertexCount(24);
      Vector3f[] vert = computeVertices(); // returns 8

      //Back
      batch.getVertexBuffer().put(vert[0].x).put(vert[0].y).put(vert[0].z);
      batch.getVertexBuffer().put(vert[1].x).put(vert[1].y).put(vert[1].z);
      batch.getVertexBuffer().put(vert[2].x).put(vert[2].y).put(vert[2].z);
      batch.getVertexBuffer().put(vert[3].x).put(vert[3].y).put(vert[3].z);

      //Right ...



My confusion comes in as to why Back only has 4 points.  Shouldn't the back consist of 2 triangles and hence 6 points, 3 points for each triangle?  That's how I've made boxes in other engines, what is different here?  What am I missing?
2

I cannot find that in my source, where is it?



Remember that jME often uses indexed triangles. So it can reuse vertices for multiple triangles.

3

This is actually in the engine source itself.  I think I figured out what it is.  TriangleBatch is not a triangle list, but some helper function/Class to create the triangle list.  As to where this was quoted from:



jme/jme/src/com/jme/scene/shape/box.java