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Creating breakable glue: Part 2

From: Creating Simulations in MassFX and 3ds Max

Video: Creating breakable glue: Part 2

With the basics of our particle system in place, we now need to introduce a way of binding the particles inside the strands together. This is where our MassFX glue operator comes in. Down in the depot, let's left-click and drag a glue operator into our flow. Now, it is important that the operator is placed below the MassFX world as it simply won't work anywhere else due to the way simulation steps are calculated in the flow. So as to be able to see how our particles are binding together in the scene, let's select the glue operator and turn on Visualize Binding.

Creating breakable glue: Part 2

With the basics of our particle system in place, we now need to introduce a way of binding the particles inside the strands together. This is where our MassFX glue operator comes in. Down in the depot, let's left-click and drag a glue operator into our flow. Now, it is important that the operator is placed below the MassFX world as it simply won't work anywhere else due to the way simulation steps are calculated in the flow. So as to be able to see how our particles are binding together in the scene, let's select the glue operator and turn on Visualize Binding.

Then we need to enable the Bind Gap option and set the Gap Distance to 2.24mm. Now if I just switch over to the Target_CloseUp camera, hopefully you can just about make out that we now have a thin blue line between each particle, indicating that they are bound or glued together. By default our Binding Type is set to Simplified, which is fine. Really though, any one of these options would work in this particular instance. The Timing option, however, is a little different.

We need to make certain that we are using On Event Entry here. This is because we only need our particles to be glued at the start of the event. If we choose Continuous, when particles from the different strands come into close proximity to one another, they would try to glue themselves together, which is not really what we want here. We can also put a check in the Allow Binding Penetration option. As our particles we'll eventually be getting knocked about quite a bit, enabling this can help prevent calculation glitches from occurring.

To add a little something extra to this effect I will also enable the Breakable By Force option. We're going to set the Torque values to 175 and then 125 respectively. Now, even though we have already added the required modifiers to our rail and stand geometry, our particle strands would not currently collide with them as we haven't yet added a MassFX collision operator into the flow. Let's drag one in from the depot and place it below our glue. Again I want to select this operator and then over in the Parameters section, click on the By List button.

Then we can add the stand and rail geometry, and of course any other collision objects we want, into the simulation. Now we're not quite finished with our strands just yet, because although they are glued together, they're still not really attached to anything in the scene. In fact, if I just hit the C key and select the Targets camera and then run the simulation from the view, you can see they simply fall down. To fix this, from our depot, let's add another MassFX glue operator and again turn on the visualize option.

To differentiate between the two glue operators I want to click the color swatch and give this one an alternative color. This will allow us to see which glue operator is currently working on which objects in the scene. For the second glue operator we need to set the binding type to distance and again make certain that our Timing option is set to On Event Entry. As before, we will check the Allow Binding Penetration option, as well as turning on Breakable By Force and setting the same Torque amounts as our first Glue operator, so 175 and 125 respectively.

In order to glue the strands to our rail geometry, we need to scroll down a little and it need to bind with section, first of all uncheck Current Event Particles. This will prevent our particles in the event being glued together a second time, and then we can put a check in the Deflectors option. This now binds our particles to a deflector in the scene. All we need to do then is add the Rail geometry to our Deflectors List; we do this by clicking the Add button and then selecting the object in the viewport. To settle our particle strands into a usable initial state for the simulation, I'm just going to click the Birth Grid operator and set the Emit Time option to -130.

This will immediately place the particles in the scene as if they had already been stimulating for 130 frames, meaning they will have settled nicely into position. If we now run the simulation, you can see our particles strands hang. We do get a little bit of motion coming from them due to the penetration off the collision meshes a little bit, but they are binding nicely together. Of course we do want to make use of the Breakable option we enabled earlier, so let's open up the 3ds Max Layer Manager and unhide the Animated Sphere layer.

I will of course need to select the sphere and then over in the Modifier List, add a PFlow Collision modifier to it. Once it is activated, we can jump over to our MassFX flow and add it to the list of our collision test operator. Now, if I press Play the sphere collides with our particle strands, breaking some of them off when the applied Torque values go beyond that was set limits. Now, although we have only had time to demonstrate a very simple setup here, hopefully you can see that the MassFX glue operator is a very powerful tool that could be employed to create all sorts of particle-binding effects.

The fact that we can make them breakable or even apply a MassFX solvent operator to them only adds to the possibilities that mParticles opens up to us.

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This video is part of

Image for Creating Simulations in MassFX and 3ds Max
Creating Simulations in MassFX and 3ds Max

51 video lessons · 2467 viewers

Brian Bradley
Author

 
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  1. 3m 27s
    1. Welcome
      58s
    2. Working with the exercise files
      46s
    3. Setting up the 3ds Max project structure
      1m 43s
  2. 39m 20s
    1. Why simulate and not animate?
      3m 38s
    2. A look at gravity and drag
      3m 55s
    3. Understanding volume, mass, and density
      3m 45s
    4. What are Newton's laws of motion?
      3m 20s
    5. Finding believable frames per second and substeps
      3m 5s
    6. Understanding the difference between rigid and soft bodies
      3m 28s
    7. More about rigid body types
      3m 32s
    8. How collisions are calculated
      4m 35s
    9. Learning the difference between concave and convex meshes
      6m 24s
    10. What is a constraint and how do we use it?
      3m 38s
  3. 24m 20s
    1. A look at the MassFX and the 3ds Max user interfaces
      5m 52s
    2. Exploring the MassFX workflow
      5m 14s
    3. Discovering ground collision and gravity
      4m 49s
    4. Adjusting substeps and solver iterations
      3m 43s
    5. Using the Multi-Editor and the MassFX Visualizer
      4m 42s
  4. 44m 11s
    1. Breaking down the shot
      4m 51s
    2. Setting up the launchers
      3m 59s
    3. Setting up the drop system
      4m 30s
    4. Prepping the cans
      3m 33s
    5. Refining the simulation on the launchers
      5m 9s
    6. Refining the simulation on the colliders
      6m 5s
    7. Baking out the simulation for rendering
      5m 37s
    8. Reviewing the simulation with an animation sequence
      5m 3s
    9. Adding an animation override
      5m 24s
  5. 33m 32s
    1. Adding a rigid constraint and creating breakability
      8m 3s
    2. Creating a moving target with the Slide constraint
      4m 47s
    3. Creating springy targets with the Hinge constraint
      5m 59s
    4. Spinning targets using the Twist constraint
      4m 57s
    5. Creating crazy targets with the Ball & Socket constraint
      4m 58s
    6. Constructing a MassFX Ragdoll
      4m 48s
  6. 36m 51s
    1. Applying the mCloth modifier and pinning the hammock
      5m 55s
    2. Setting up the hammock's physical properties
      5m 39s
    3. Working with the mCloth interaction controls
      6m 14s
    4. Attaching the hammock to animated objects
      4m 5s
    5. Putting a rip in mCloth
      6m 14s
    6. Using mCloth to create a rope object
      4m 53s
    7. Creating a soft body object
      3m 51s
  7. 14m 47s
    1. Adding forces to a simulation
      5m 27s
    2. Putting forces to practical use
      5m 33s
    3. Using forces with mCloth
      3m 47s
  8. 35m 27s
    1. Walking through mParticles
      4m 38s
    2. Using fracture geometry
      6m 0s
    3. Creating breakable glue: Part 1
      4m 19s
    4. Creating breakable glue: Part 2
      5m 19s
    5. Creating a gloopy fluid: Part 1
      4m 14s
    6. Creating a gloopy fluid: Part 2
      4m 41s
    7. Adding forces to mParticles
      6m 16s
  9. 1m 5s
    1. What's next?
      1m 5s

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