3DTrajMaster: A Step-by-Step Guide to Video Motion Control

In this article, I’ll walk you through an incredible tool called 3D Traj Master, which is essentially a video generator that allows you to control the movements of one or multiple objects within a video. This tool takes a text prompt describing what you want to create and also lets you input a 3D trajectory to define the path for the object’s movement. The result is a video where you have granular control over how objects move within the scene.

What is 3DTrajMaster?

3D Traj Master is a video generation tool that lets you control the movement of objects in a video using 3D trajectories. By inputting a text prompt and defining specific paths, you can create customized videos where objects move precisely as you want. It also allows for advanced editing, like swapping backgrounds, changing characters, and modifying details such as clothing or hair. This tool offers high accuracy and flexibility, making it stand out compared to other video generation methods.

3DTrajMaster Overview:

Aspect	Details
Project Name	3D Traj Master
Project Page	3D Traj Master Project
Primary Function	Video generator with controlled object movement using 3D trajectories.
Input	Text prompts describing objects/scenes and 3D trajectories for movement.
Output	Customized videos with objects moving along specified paths.
Unique Capability	Precise control over object movements and scene editing.
Open-Source Tools	Cog Video (via GitHub repository).
Access	Dataset and instructions available on Hugging Face and GitHub.

How 3D Traj Master Works

Inputting Text Prompts and Trajectories

To use 3D Traj Master, you start by providing a text prompt that describes the scene or object you want to create. For example, you might input a location like a desert. Then, you define a 3D trajectory, which is the path you want the object to follow.

For instance:

• If you input a lizard as the object, you’ll get a video of a lizard moving along the specified path.
• If you input a polar bear, the tool will generate a video of a polar bear following the same trajectory.
• Similarly, a rhino or even a woman can be animated along the path you define.

This level of control allows you to create highly customized videos with precise object movements.

Swapping Backgrounds and Characters

One of the standout features of 3D Traj Master is the ability to swap backgrounds while keeping the character the same. For example, if you set the location as a desert, you can later change the background to something else, like a beach or a snowy field, without altering the character’s movement.

Here’s an example:

• You prompt the character to be a koala with specific details like soft gray fur, large round ears, and a black nose.
• You input a trajectory for the koala to follow.
• Then, you can change the background to various settings, such as a stone path, desert, beach, snowy field, or grass field.

This flexibility allows you to create diverse scenes with the same character and movement.

Combining Multiple Trajectories

3D Traj Master also supports multiple trajectories, meaning you can control the movements of more than one object in a single video. For example:

• You can specify a polar bear and a drone in the woods, and the tool will generate a video where both objects move along their respective paths.
• Similarly, you can create a scene with a man and a robot in a desert, each following their own trajectory.

This feature becomes even more impressive when you add a third trajectory. For instance, you can have three different objects moving along their specified paths in the same video.

Advanced Editing Features

Editing Specific Elements in the Video

3D Traj Master goes beyond just controlling object movements. It also allows you to edit specific elements within the video, such as a person’s hair, clothing, or even their gender.

For example:

• You might start with a prompt describing a man with short black hair, a medium figure, a gray striped sweater, black jeans, and light brown leather shoes.
• You then upload trajectories for the man and a bird.
• After generating the initial video, you can further edit it by changing specific details.

Here’s what you can do:

• Change the man’s hair from short black to bald.
• Swap the gray striped sweater for a yellow shirt.
• Add a backpack to the man.
• Even change the man into a woman.

These editing capabilities make 3D Traj Master a powerful tool for fine-tuning videos to meet your exact requirements.

Comparing 3D Traj Master with Other Tools

Accuracy in Following Trajectories

When compared to other state-of-the-art video generation tools, 3D Traj Master stands out for its accuracy in following specified trajectories. For example:

• If you prompt it with a dog with a fluffy coat, wagging tail, and warm brown fur, and set the location as a Sunset Beach, 3D Traj Master will ensure the dog follows the exact trajectory you define.
• In contrast, other tools like Torah or Director Video often fail to achieve the same level of precision.

Handling Multiple Trajectories

3D Traj Master truly shines when it comes to handling multiple trajectories. For instance:

• If you specify a man with messy black hair and a zebra in a forest, and define two trajectories, 3D Traj Master will accurately animate both the man and the zebra along their paths.
• Again, other tools struggle to achieve this level of accuracy and consistency.

Getting Started with 3D Traj Master

Accessing the Tool

If you’re interested in trying out 3D Traj Master, you can find a Hugging Face link at the top of the page. This link provides access to the dataset and a GitHub repository containing all the instructions you need to run the tool using the open-source Cog Video.

Conclusion

3D Traj Master is a highly flexible and powerful tool for video generation and editing. Its ability to control object movements with precision, swap backgrounds and characters, and edit specific elements within a video sets it apart from other tools in the field. If you’re creating simple animations or complex multi-object scenes, 3D Traj Master offers the features and accuracy you need to bring your ideas to life.