MCG - Deformers and Gizmos

Duration null mins
Intermediate

Note: The interface in this tutorial applies to MCG 2017. The interface in MCG 2018 has been revised to a new node naming scheme.

In this post, I’ll be covering a little experiment I’ve been working on to create deformers and their respective gizmos in MCG 2017. As the saying goes, “the proof of the pudding is in the eating”, so I put these deformers to the test by stretching, bending, rippling, tapering, and twisting a few primitives into the flower you see below. ? ?

Martin Ashton, tutorial - MCG - Deformers and Gizmos

A little bit of context...

The native deformers in 3ds Max provide you with a gizmo in the modifier stack to help you manipulate and preview the deformer’s frame of reference. By manipulating this gizmo, you can provide further refinements to the deformation. Gizmos can be keyframed and animated, however they do not behave as regular objects in the scene. For example, they can’t be constrained to a path, nor can they be rendered as splines.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

Note: right-click on the image and open it in a new tab to see it in a higher resolution.

With these limitations in mind, one of the motivations behind this little experiment was to open the door to different gizmo workflows by defining them as splines in the scene. Under this light, MCG gizmos would act similarly to world-space deformers, while still retaining the behavior of a spline in the scene. This approach makes it possible to constrain gizmos, render them, and even use them to drive multiple deformers.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

The result of this project is the seven deformers you see below. You can download and extract them from the .zip file at the bottom of this post. I hope that as I unravel the details of my approach, you will be inspired to create a new family of gizmo-based MCG tools.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

From left to right: MCGRipple, MCGWave, MCGNoise, MCGTwist, MCGTaper, MCGBend, MCGStretch.

Building a Solid Foundation

My first step was to make sure I could easily compare my MCG deformers’ results with the outputs of the native deformers in 3ds Max. By comparing my results with an established baseline, I could validate that I was on the right track. To do this, I decided to guide the implementation of my MCG deformers using the sample code in the 3ds Max SDK.

If you want to browse the 3ds Max SDK for yourself, you can install it from your Autodesk installer’s extraction path (not to be confused with your installation path under Program Files). For reference, mine was under C:\Autodesk\Autodesk_3ds_Max_2017\x64\Tools\MAXSDK\SDK_3dsMax2017.msi. Once you have the SDK installed, you can access the sample C++ source code for the Bend modifier (and other modifiers) under C:\Program Files\Autodesk\3ds Max 2017 SDK\maxsdk\samples\modifiers\bend.cpp.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

The Map function of each C++ deformer contains its core deformation logic. In the code above, the “BendDeformer::Map” function is responsible for bending a single point. Note that for the sake of time and simplicity, the MCG deformers I created do not include the “doRegion” logic, and therefore omit the “Limit Effect” options in their respective rollouts.

The Anatomy of the MCG Deformer and its Gizmo

After a few attempts at implementing and re-implementing several deformers, I began to converge towards a common construction pattern. This pattern, in the context of the Bend modifier, looks like this:

1. Create the Modifier
MCGBend.maxtool ? BendMesh.maxcompound ? BendDeformer.maxcompound

2. Create the Gizmo
MCGBendGizmo.maxtool ? BendSpline.maxcompound ? Custom MaxScript UI

1. Create the Modifier

MCGBend.maxtool

The MCGBend.maxtool file generates the MCG modifier inside 3ds Max. This is where I specified my parameter limits, defaults, and the optional gizmo input node.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

BendMesh.maxcompound

BendMesh.maxcompound applies a bend deformation to a whole mesh. The advantage of encapsulating this deformation as a compound is to enable its reuse in other graphs.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

BendDeformer.maxcompound

BendDeformer.maxcompound contains the core deformation logic for a given point. If you’re curious about the theory behind deformers, I strongly recommend the following lecture notes by Prof. Torsten Möller from Simon Fraser University. The logic you see below loosely translates to the code found in the bend.cpp file’s BendDeformer::Map function.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

2. Create the Gizmo

MCGBendGizmo.maxtool

The MCGBendGizmo.maxtool file generates the MCG spline you can create under Create > Shapes > Max Creation Graph > MCGBendGizmo. Each gizmo has two Vector3 inputs to define the minimum and maximum corners of the gizmo’s bounding box. These Vector3 values are used as inputs to the SplineBoxPrimitive compound, which generates a subdivided spline box. This spline box is subsequently deformed with the BendSpline compound to produce a preview of the deformation.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

An important note about the Shape: Matrix node. The “Shape: Matrix” node must be connected to the graph in some way (we’re using IgnoreSecond to include it, but to omit its output) since it provides us with an auto-generated reference to the current node within the MaxScript plugin definition. We’ll see why this is important in a bit.

BendSpline.maxcompound

Much like the BendMesh compound, the BendSpline compound applies the BendDeformer to all the knots on a given spline.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

Custom MaxScript UI

To streamline the usage of the MCG gizmo in the scene, I cooked up a custom MaxScript UI to add two buttons to the auto-generated rollout, namely: “Update Box from Object” and “Apply to Object”. This way, once a MCG gizmo is created in the scene, you can press the “Apply to Object” button to apply the gizmo’s associated modifier onto an object. Likewise, you can simply use the “Update Box from Object” button to update the gizmo’s bounding box based on the picked object (without applying the modifier).

Martin Ashton, tutorial - MCG - Deformers and Gizmos

When an object is picked with the “Apply to Object” button, three things happen: 1) the gizmo updates its bounding box based on the picked object; 2) the MCGBend modifier is applied to the object; 3) the gizmo’s parameters are wired to the modifier’s parameters in a one-way direction.


An important note about gizmo parameter wiring: based on my experiments, creating a two-way parameter wiring causes some instability in 3ds Max when objects are cloned. To avoid this instability, I restricted the parameter wiring to a one-way direction (from the gizmo to the modifier). A side-effect of this one-way connection is that the object cloning process breaks all the original wired connections to the gizmo, meaning that the modifier must be re-applied when one of the wired objects is cloned. As such, I found it helpful to create all my primitives before applying the gizmo.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

With the gizmo applied, it now drives the modifier on the picked object. You can use the same workflow to drive the bend deformation of several objects.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

Now that we have an idea of how the gizmo behaves, we can take a closer look at how to define its custom MaxScript UI.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

Open the MaxScript editor, define an empty rollout, then use the special tags: > and > to let MCG automatically populate these regions with the parameters and event handlers defined in the graph. With these tags in place, you can add your own UI elements below the > tag. Likewise, you can add your own event handlers below the > tag. By using these tags, you no longer have to re-synchronize your custom UI every time you change your graph’s parameters from within the MCG editor.

Now, if we take a little step back - remember that note about the Shape: Matrix operator in MCGBendGizmo.maxtool? Connecting Shape: Matrix into your graph provides the rollout with a valid reference to an owningNode variable. This variable represents the node associated to the gizmo, which we need to use in the call to paramWire.connect. In the absence of Shape: Matrix, the owningNode variable would be undefined, preventing us from wiring its parameters.

Martin Ashton, tutorial - MCG - Deformers and Gizmos

I would recommend saving this rollout as a standalone .ms file next to the .maxtool file you want to use it on. This way, you can quickly iterate on its contents. When you’re ready, copy the whole rollout code and paste it into the .maxtool’s Custom UI tab under Max Creation Graph Editor > Edit > Graph Properties > Custom UI Tab. This embeds the custom UI into the .maxtool. The final step is to save and evaluate the .maxtool to see how it behaves in Max. Any errors encountered along the way should be displayed in the MaxScript Listener (F11).

Martin Ashton, tutorial - MCG - Deformers and Gizmos

Addendum

MCG Deformer Performance

Noise Deformer

The MCGNoise deformer was one of the most challenging deformers to implement, mainly due to the complexity of the fractal noise code in the 3ds Max SDK. Keep in mind that the output of this deformer will vary compared to the native version because of the different random number generation process inside MCG. What’s more, a portion of the native code relies on the promotion of a single-precision float to a double-precision float - a conversion which can't be performed in MCG due to the absence of the double-precision float type. The consequence of this detail is that for certain seed values, the MCG noise deformer may produce flat regions and/or sharp discontinuities. I found that I could mitigate this issue by exploring different seed values.

Download

Download: MCG_Deformers_and_Gizmos.zip
Instructions: Extract the .zip file anywhere on your filesystem. Copy the MCG_Deformers_and_Gizmos folder into your Max Creation Graph 2017 user directory: C:\Users\\Autodesk\3ds Max 2017\Max Creation Graph\Tools\Downloads\. The next time you open 3ds Max 2017, the deformers and gizmos will be automatically loaded and available for you to test in your scene. You can also open these files from the MCG editor to see how they were made.

Based on this experiment, I found that the MCG deformers were not as fast as the native deformers. The tradeoff, however, is the gain in flexibility to control different objects' modifiers with the same spline-based gizmo.

Tools
3ds Max
3ds Max
Industries
  • Animation
  • Creative Finishing
  • Game Development
  • VFX
  • Visualization

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We use AgrantSEM to deploy digital advertising on sites supported by AgrantSEM. Ads are based on both AgrantSEM data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that AgrantSEM has collected from you. We use the data that we provide to AgrantSEM to better customize your digital advertising experience and present you with more relevant ads. AgrantSEM Privacy Policy
Bidtellect
We use Bidtellect to deploy digital advertising on sites supported by Bidtellect. Ads are based on both Bidtellect data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bidtellect has collected from you. We use the data that we provide to Bidtellect to better customize your digital advertising experience and present you with more relevant ads. Bidtellect Privacy Policy
Bing
We use Bing to deploy digital advertising on sites supported by Bing. Ads are based on both Bing data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bing has collected from you. We use the data that we provide to Bing to better customize your digital advertising experience and present you with more relevant ads. Bing Privacy Policy
G2Crowd
We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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