From f80d6474a4c9e69725a1de1fe13acdb07a56c2b4 Mon Sep 17 00:00:00 2001
From: abies <abies@adres.pl>
Date: Mon, 28 Jul 2014 12:14:14 +0200
Subject: [PATCH] Utility methods for getting arbitrary properties for
 triangles from mesh buffers

---
 .../src/main/java/com/jme3/scene/Mesh.java    | 57 ++++++++++++++++++-
 1 file changed, 54 insertions(+), 3 deletions(-)

diff --git a/jme3-core/src/main/java/com/jme3/scene/Mesh.java b/jme3-core/src/main/java/com/jme3/scene/Mesh.java
index 8b3ffc80e..5717350fa 100644
--- a/jme3-core/src/main/java/com/jme3/scene/Mesh.java
+++ b/jme3-core/src/main/java/com/jme3/scene/Mesh.java
@@ -824,12 +824,28 @@ public class Mesh implements Savable, Cloneable {
      * @param v3 Vector to contain third vertex position
      */
     public void getTriangle(int index, Vector3f v1, Vector3f v2, Vector3f v3){
-        VertexBuffer pb = getBuffer(Type.Position);
+        getTriangle(Type.Position,index,v1,v2,v3);
+    }
+    
+    /**
+     * Gets the triangle vertex data at the given triangle index 
+     * and stores them into the v1, v2, v3 arguments. Works for 3-value components like position or normals
+     * 
+     * @param type buffer type to retrieve data from 
+     * @param index The index of the triangle. 
+     * Should be between 0 and {@link #getTriangleCount()}.
+     * 
+     * @param v1 Vector to contain first vertex data
+     * @param v2 Vector to contain second vertex data
+     * @param v3 Vector to contain third vertex data
+     */
+    public void getTriangle(Type type, int index, Vector3f v1, Vector3f v2, Vector3f v3){
+        VertexBuffer pb = getBuffer(type);
         IndexBuffer ib = getIndicesAsList();
         if (pb != null && pb.getFormat() == Format.Float && pb.getNumComponents() == 3){
             FloatBuffer fpb = (FloatBuffer) pb.getData();
 
-            // aquire triangle's vertex indices
+            // acquire triangle's vertex indices
             int vertIndex = index * 3;
             int vert1 = ib.get(vertIndex);
             int vert2 = ib.get(vertIndex+1);
@@ -839,11 +855,46 @@ public class Mesh implements Savable, Cloneable {
             BufferUtils.populateFromBuffer(v2, fpb, vert2);
             BufferUtils.populateFromBuffer(v3, fpb, vert3);
         }else{
-            throw new UnsupportedOperationException("Position buffer not set or "
+            throw new UnsupportedOperationException(type + " buffer not set or "
                                                   + " has incompatible format");
         }
     }
     
+    /**
+     * Gets the triangle vertex data at the given triangle index 
+     * and stores them into the v1, v2, v3 arguments. Works for 2-value components like texture coordinates
+     * 
+     * @param type buffer type to retrieve data from 
+     * @param index The index of the triangle. 
+     * Should be between 0 and {@link #getTriangleCount()}.
+     * 
+     * @param v1 Vector to contain first vertex data
+     * @param v2 Vector to contain second vertex data
+     * @param v3 Vector to contain third vertex data
+     */
+
+    public void getTriangle(Type type, int index, Vector2f v1, Vector2f v2, Vector2f v3){
+        VertexBuffer pb = getBuffer(type);
+        IndexBuffer ib = getIndicesAsList();
+        if (pb != null && pb.getFormat() == Format.Float && pb.getNumComponents() == 2){
+            FloatBuffer fpb = (FloatBuffer) pb.getData();
+
+            // acquire triangle's vertex indices
+            int vertIndex = index * 3;
+            int vert1 = ib.get(vertIndex);
+            int vert2 = ib.get(vertIndex+1);
+            int vert3 = ib.get(vertIndex+2);
+
+            BufferUtils.populateFromBuffer(v1, fpb, vert1);
+            BufferUtils.populateFromBuffer(v2, fpb, vert2);
+            BufferUtils.populateFromBuffer(v3, fpb, vert3);
+        }else{
+            throw new UnsupportedOperationException(type + " buffer not set or "
+                                                  + " has incompatible format");
+        }
+    }
+    
+    
     /**
      * Gets the triangle vertex positions at the given triangle index 
      * and stores them into the {@link Triangle} argument.