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Breakdown: How a Kar98k Works

By April 6, 2021November 29th, 20223D Modeling, Animation

It's finally finished!

After roughly 509 hours of hard work, I completed my Kar98k animation. Here’s the final video:


A lot of people have asked, “How long does it take to put something like this together?” When they hear me tell them 500 hours, their jaw normally drops, and probably thinking I’m a crazy lunatic haha! I tend to be a bit OCD about a lot of things and happen to be a huge perfectionist. It’s certainly held me back. If I could release content more regularly, I think it would make a lot of folks happier.

One other thing I’d like to mention is that I suffer from Imposter Syndrome. Scrolling through Instagram, I see a TON of really great artwork. It constantly makes me think, man, there is absolutely no way I will ever be that good. That I’ll never have that “artistic” side. It’s true that the content I create isn’t exactly “artsy fartsy”. You’ll never find it in a gallery or anything like that. I’ve never been good at drawing, and to be be honest, I don’t really enjoy it. But I really appreciate the people that do!

I also want to say that I think Instagram can be a dangerous place. When you’re scrolling and see all this great work, it can really eat at ya. Make you feel you’re not good enough, and that you don’t fit in. The problem is that you’re only seeing everyone’s “demo reel”. Not the many pieces of work they’ve done that got them to where they are.

Anyway, just wanted to say that before anything else. Let’s get into the meat of it!


The first thing I do at the beginning of every project is research the crap out of it. So I ran a couple polls on YouTube, asking what kind of firearm they’d like to see animated. And of course the most-wanted piece was the beloved Kar98k. So that’s what I did!

World of Guns - Kar98k

World of Guns – Kar98k

One of the most helpful resources in trying to figure out how the Kar98k worked was World of Guns on Steam. It let’s you field strip tons of different firearms, hide/show parts, show part names, and show the main firing sequence. I can’t recommend it enough.

In order to get some of the finer details, I needed to dig a little deeper. Having all the part names, I was able to do Google searches and find high resolution images of mostly everything! Also having an interest in these rifles, I purchased a book on eBay, Bolt Action Rifles by Frank de Haas. I was curious how Paul Mauser himself came up with the famous action that a lot of hunting rifles still use to this day.

As I was creating some of the parts, I did run into a few snags with the bolt sleeve. So I found an actual one on eBay and purchased a digital caliper in order to get more accurate dimensions. This was however, the only part I needed to do measure.


When most folks think of modeling, they normally think of a CAD-based program, like SolidWorks. However, the kind of modeling I do is polygon-based. My tool of choice for the past 10 years or so has been Cinema 4D. SolidWorks can certainly do the job, but for certain things like texturing, it’s much easier to do if the model has proper quad-based topology.

In order to speed up the initial modeling process, I purchased a 3D model of a Kar98k.

This was a fantastic starting point, but this was a low-poly model, and none of the interior portions of the rifle were modeled. So I began breaking everything apart and renaming everything in the scene. Altogether, around 70 individual models had to refined/modeled! Here are a few of the ones I was most happy with:




Bolt Sleeve

Trigger Guard

Lower Band

Barrel Band

Bayonet Stud



Cocking Piece

Firing Pin


Bolt Stop

Safety Lever

Magazine Spring

Rear Sight

Front Sight


Guard Screws


Kar98k Rigging Controls

Kar98k Rigging Controls

After all the models were for the most part created, I was ready to begin rigging. This was by far my favorite part of the project. It makes the animation process 100x easier by assigning sliders to the movement of parts. For example, instead of manually animating the Trigger’s rotation, I assign a slider to it that defines a minimum and maximum rotation. For that same slider, I can also assign another part’s rotation. The Sear’s rotation is controlled by the same slider.

Cinema 4D Xpresso

Cinema 4D Xpresso

To set this all up, Cinema 4D has a fantastic system known as Xpresso. It looks daunting at first, but it’s really not too difficult. A good way to think about it is a visual programming language. Except it’s not exactly programming… lol. Because my brain doesn’t have the capacity for that.

Kar98k Rigging Animation

Kar98k Rig


Corona Materials

Corona Materials

After everything was for the most part rigged, I was ready to start creating materials and textures. Cinema 4D is very capable of doing this out of the box. However, I wanted something a bit more photorealistic. With Corona renderer, I was able to create better looking metals and plastics with ease.

While most of the materials have a fairly simple setup, others took a bit more finesse to look nice:

Corona Node Material

Corona Node Material


Wood Stock

When it came time to texture the stock, I wasn’t happy with the built-in wood shader that Cinema 4D offers. So I needed to create my own wood texture. To do this, I resorted to Substance Painter, which allows much finer control. The ability to add surface imperfections and roughness on the edges.

Substance PainterSubstance PainterSubstance Painter

UV Unwrapping

Before actually beginning the texture work, Substance Painter needs to know how the textures are applied. A process known as UV Unwrapping is done. I use a separate application called Rizom UV. Essentially all the geometry information needs to be laid out flat so that Substance Painter can apply the textures to the 3D surface. Think about taking a cube made out of paper, and cutting its edges so that it can be laid flat.

Rizom UVRizom UV


Before doing any actual animation, it’s important to establish the order of events that need to take place. This is where storyboarding comes in. A template of all the topics I’d like to cover, starting with most important and ending with least important. I’ll write a full script of the animation, and render out still frame images to accompany the script.

Kar98k Storyboard

Kar98k Storyboard


Cinema 4D Takes

Cinema 4D Takes

With all the shots established, and the script written, it was finally time to begin animating! Cinema 4D’s animation tools are pretty great, which definitely made the process easier. With a feature known as Takes, I was able to create all my animation scenes in one project file.

Cinema 4D Animation

Cinema 4D Animation

Kar98k Intro Animation

Kar98k Intro Animation


Kar98k Rendering

Kar98k Rendering

With all the animation data in place, it was time to begin the rendering process! A 3 minute, 40 second animation is a total 220 seconds. Each second of animation is 30 still frame images (assuming the animation runs at 30fps). So I would need to render AT LEAST 6,600 still images. And that doesn’t include the transition frames, as sections of the Kar98k fade in and out of place!

I’ve got a pretty decent computer, but I wasn’t about to let it chug for that long. Especially since I am using Corona, a CPU-based renderer. So I resorted to an external render farm known as Pixel Plow to do the work for me. It’s pretty simple… I send them my Cinema 4D project files, they render all my frames on their huge server, then I download the finished frames.


After I had gotten all the rendered frames downloaded from the render farm, it was time to composite everything in After Effects. This is where I did some color-correction, added particles, lens flares, camera blur, etc.

After EffectsAfter Effects

Kar98k Bullet Simulation

At about 1:48 in the animation is when the expanding gases from the powder charge propel the bullet through the barrel. For this particular part, I used a plugin called TurbulenceFD to create the fire effect. I was then able to overlay the rendered fire frames over the Kar98k animation.

Bullet Simulation


As you can see, there are many pieces that make up a full animation! So again, when someone asks why it takes me so long to create these animations, hopefully this explains why :P I do think there are plenty of people out there that could produce the same quality of animation in a fraction of the time. Like I said, I can’t get past my OCD in making sure the geometry is as good as I can get it, parts don’t intersect, etc.

I hope this article was helpful to explain my animation process. If anyone has additional questions, feel free to use the comments section below and I will try to answer as quickly as I can!


  • lee says:

    I want to learn 3d software to make gun models, how can I get parts drawings

  • Gage Purcell says:

    Are any of these models downloadable? I want to 3d print this and see if i can get it to work in real life.

    • Henry says:

      It’s likely going to cost you more than buying an already functioning version.

    • Hey Gage, there are some models on TurboSquid that you can buy. I haven’t put any gun models there myself though. My models aren’t meant for 3D printing. These are primarily meant for illustrative purposes.

  • Christoph says:

    I’m always amazed at the dedication and creativity of these people, I’ve just started to learn c4d and realize that there is still a lot of work and time ahead of me. You my friend are among the best, creating something like this is amazing for me!

  • James says:

    This article is a good read, however, I was interested in the measurements of the parts of the sniper rifle. So if you could please reach out to me and inform me of the measurements please and thank you!

  • Aadam Iqbal says:

    This article is very helpful for me.

  • Matt,

    You do amazing work and your work ethic is second to none. You’re obviously a master C4D user and it shows. Any 3D artist would agree. As a 3D generalist myself, I can’t even imagine the time and dedication it takes to master this skill. Keep up the good work and stop focusing on how much time it takes you. Anyone who has the budget to hire a 3D artist can see the value you bring.


    • Thanks Jordan, that’s very kind of you to say :) I don’t think I’ll ever consider myself a master C4D user by any means. There’s still so many areas of the software that I haven’t even touched. I would say I’m pretty good with the tools I know how to use :P

  • Shayan says:

    Wow, thanks for sharing, your work is truly amazing! I want to get into animation and your videos really inspire me.
    Question: How do you deal with the timing of the music and voice-over to fit the animation? Do you animate first and then edit the audio in after effects or do you record the voice over before you start animating and time it while you work on the animation?

    Looking forward to the next video!

    • Not to speak for Matt, but everything is written in a script. He has the timing and pacing down before any animation takes place.

    • Hi Shayan, thank you so much for your nice comments. Reading things like this really push me to create more content :)

      For timing the voiceover, first I’ve got a script written out. Then I normally record my own voice as a placeholder. From this point is when I do the actual animation so that I can time it with my voice. Before actually rendering the animation, I render out what’s called a “viewport animation” which is much much quicker as it doesn’t need to calculate lighting/reflections. I’ll normally go back and forth a few times until I’ve got the animation timed to my voice. When I order the professional voiceover, it’s usually pretty close to the same speed my voice was, so I don’t get too much overlap.

      As far as music goes, I’ll add it right around when I am animating. I’ll normally render a few hundred extra frames in case I need to cut it at certain parts to time it with my music. I usually have to repeat the track 1-2 times throughout the project. For that I just do some simple cross-fading in After Effects.

      Haha hopefully that answers your questions! Glad I could be an inspiration :)

    • Abdel says:

      that’s really awesome, thank you for sharing this masterpiece with us. If only you can share the drawing. Thank you!

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