RMat44: add a constructor and inverseRotationTranslation()

src/main/java/com/github/stephengold/joltjni/RMat44.java

@@ -328,6 +328,21 @@ public RMat44 inversed() {
         return result;
     }
 
+    /**
+     * Return the inverse of the current matrix, assuming the current matrix
+     * consists entirely of rotation and translation. The current matrix is
+     * unaffected.
+     *
+     * @return a new matrix
+     */
+    public RMat44 inversedRotationTranslation() {
+        long currentVa = va();
+        long resultVa = inversedRotationTranslation(currentVa);
+        RMat44 result = new RMat44(resultVa, true);
+
+        return result;
+    }
+
     /**
      * Test whether the current matrix is equal to the argument. The current
      * matrix is unaffected.
@@ -432,6 +447,17 @@ public RVec3 multiply3x4(Vec3Arg vec3Arg) {
 
         return result;
     }
+
+    /**
+     * Copy the current matrix to a new, single-precision matrix. The current
+     * matrix is unaffected.
+     *
+     * @return the new matrix
+     */
+    public Mat44 toMat44() {
+        Mat44 result = new Mat44(this);
+        return result;
+    }
     // *************************************************************************
     // Object methods
 
@@ -505,6 +531,8 @@ native private static void getQuaternion(
 
     native private static long inversed(long currentVa);
 
+    native private static long inversedRotationTranslation(long currentVa);
+
     native private static long multiply(long m1Va, long m2Va);
 
     native private static void multiply3x3(long matrixVa, float[] tmpFloats);

src/main/native/glue/r/RMat44.cpp

@@ -256,6 +256,20 @@ JNIEXPORT jlong JNICALL Java_com_github_stephengold_joltjni_RMat44_inversed
     return reinterpret_cast<jlong> (pResult);
 }
 
+/*
+ * Class:     com_github_stephengold_joltjni_RMat44
+ * Method:    inversedRotationTranslation
+ * Signature: (J)J
+ */
+JNIEXPORT jlong JNICALL Java_com_github_stephengold_joltjni_RMat44_inversedRotationTranslation
+  (JNIEnv *, jclass, jlong currentVa) {
+    const RMat44 * const pCurrent = reinterpret_cast<RMat44 *> (currentVa);
+    RMat44 * const pResult = new RMat44();
+    TRACE_NEW("RMat44", pResult)
+    *pResult = pCurrent->InversedRotationTranslation();
+    return reinterpret_cast<jlong> (pResult);
+}
+
 /*
  * Class:     com_github_stephengold_joltjni_RMat44
  * Method:    multiply