From 9cf428352d7d9e980398ff7c7a2734894ad1c099 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Fri, 9 Sep 2005 14:39:48 +0000
Subject: [PATCH] add TransformState::get_inverse()

---
 panda/src/pgraph/transformState.I | 13 +++++++++++++
 panda/src/pgraph/transformState.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/panda/src/pgraph/transformState.I b/panda/src/pgraph/transformState.I
index 1d985950c4..1343b9a260 100644
--- a/panda/src/pgraph/transformState.I
+++ b/panda/src/pgraph/transformState.I
@@ -624,6 +624,19 @@ get_mat3() const {
                    _mat(3, 0), _mat(3, 1), _mat(3, 3));
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: TransformState::get_inverse
+//       Access: Published
+//  Description: Returns the inverse of this transform.  If you are
+//               going to immediately compose this result with another
+//               TransformState, it is faster to do it in one
+//               operation with invert_compose().
+////////////////////////////////////////////////////////////////////
+INLINE CPT(TransformState) TransformState::
+get_inverse() const {
+  return invert_compose(TransformState::make_identity());
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: TransformState::get_geom_rendering
 //       Access: Published
diff --git a/panda/src/pgraph/transformState.h b/panda/src/pgraph/transformState.h
index d8b43ddda4..10b34c11e7 100644
--- a/panda/src/pgraph/transformState.h
+++ b/panda/src/pgraph/transformState.h
@@ -161,6 +161,8 @@ PUBLISHED:
   CPT(TransformState) compose(const TransformState *other) const;
   CPT(TransformState) invert_compose(const TransformState *other) const;
 
+  INLINE CPT(TransformState) get_inverse() const;
+
   INLINE int get_geom_rendering(int geom_rendering) const;
 
   int unref() const;