tutorial: comments

Author: stephengold

TutorialApps/src/main/java/jme3utilities/tutorial/HelloKinematics.java

@@ -52,7 +52,7 @@ public class HelloKinematics
     /**
      * physics-simulation time (in seconds, ≥0)
      */
-    private static float elapsedTime = 0f;
+    private static float elapsedTime;
     /**
      * kinematic ball, orbiting the origin
      */

TutorialApps/src/main/java/jme3utilities/tutorial/HelloPin.java

@@ -106,7 +106,7 @@ public void simpleInitApp() {
         NativeSoftBodyUtil.appendFromTriMesh(squareGrid, cloth);
         physicsSpace.addCollisionObject(cloth);
 
-        // Pin one of the corner nodes by setting its mass to zero:
+        // Pin one of the corner nodes by zeroing its mass:
         int nodeIndex = 0; // upper left corner
         cloth.setNodeMass(nodeIndex, PhysicsBody.massForStatic);
         /*

TutorialApps/src/main/java/jme3utilities/tutorial/HelloServo.java

@@ -114,7 +114,7 @@ public void simpleInitApp() {
         configureCamera();
         physicsSpace = configurePhysics();
 
-        // Add a dynamic, green frame:
+        // Add a dynamic, green doorframe:
         PhysicsRigidBody frameBody = addFrame();
 
         // Add a dynamic, yellow box for the door:

TutorialApps/src/main/java/jme3utilities/tutorial/HelloSoftRope.java

@@ -96,7 +96,7 @@ public void simpleInitApp() {
         NativeSoftBodyUtil.appendFromLineMesh(lineMesh, rope);
         physicsSpace.addCollisionObject(rope);
 
-        // Pin one of the end nodes by setting its mass to zero:
+        // Pin one of the end nodes by zeroing its mass:
         int nodeIndex = 0;
         rope.setNodeMass(nodeIndex, PhysicsBody.massForStatic);
     }