When Gemini 2.5 meets Three.js, a complete solution for animating teaching demos

Three.js is a tool that allows web pages to display "three-dimensional" images. Think of it as:

• It provides a set of tools that allow developers to draw all kinds of 3D shapes on web pages, such as cubes, spheres, and so on.
• It can also make these 3D shapes move for a variety of animation effects.
• It controls lighting, shadows, materials, and more to make 3D scenes look more realistic.

In more layman's terms:

Previously, web pages could only display flat things, but with Three.js, web pages can display three-dimensional, rotating, moving 3D images. This makes web pages more vivid and interesting.

What happens when we use a big model to generate each type of code, but generate Three.js code directly? Gemini 2.5 gives us the answer.

Here is an example given by an overseas god:

How difficult is it to create these kinds of 3D effects?

Are the physical properties shown in the animation accurate?

Accurate.

Is it possible to do something similar without knowing the code?

It can, but it can't be done beautifully.

Is it free to use Gemini 2.5?

exist Gemini(Easy to use) There is a daily limit.Google AI Studio(Difficult to use) Free to use, but can not directly preview the demo.

Creating a 3D demo animation with physical properties together

pre-conditions

1. First you have to be able to access https://gemini.google.com/ and log in to your account normally.

2. Remember the keyword "Three.js".

3. Select the "Gemini 2.5 Pro" model and check the "Canvas" box in the dialog box.

Pretend to be a "physics teacher" who wants to explain the concept of gravity to students. The first step is to quickly get the AI to give a solution.

Cue word:

As a secondary school physics teacher, I am explaining the concept of gravitational force to my students in a classroom, which is an introductory course, and the students are just learning about it. I would like to present a 3D animation that will allow the students to understand the principles of gravity through visualization. Please describe in words what effects the animation should contain to make the students understand and be interested in it, and visualize the effects of the animation and describe them in detail in an accurate and logical way.

This is a 3D demo animation, only one animation effect is allowed, the animation effect should be made sure to be simple enough, but the description should be detailed. Below is a text only description of the effect of this 3D demo animation to start the description:

Okay, I got some inspiration below, so let's just use the puts:

3D demo animation: gravitational display of an apple falling to the ground

Animated scenes:
The background of the animation is a peaceful green meadow with a big tree full of red apples above. The sunlight falls softly and the sky is blue, creating a natural and harmonious atmosphere.

Animation effects:
In the center of the screen, a bright red apple hangs from a tree branch, bobbing slightly. As time passes, the apple's stalk gradually thins and eventually breaks, and the apple begins to fall.

At the moment the apple leaves the branch, the word "gravity" appears in the center of the screen (transparent, slightly glowing) and then slowly disappears. The apple falls downward in a uniformly accelerated motion, and as it approaches the ground, its trajectory is briefly slowed down so that students can observe the acceleration of the apple before it hits the ground.

Landing moment:
When the apple touches the grass, it bounces up slightly a little bit and then rests quietly on the grass. At the same time, a simple white arrow appears above the apple, pointing towards the ground to indicate the direction of gravity, accompanied by a brief text message that says: "Gravity always points towards the ground."

Animation Summary:
The apple is lying quietly on the grass, and the image slowly pulls away, ending the animation. Throughout the process, the animation remains smooth and simple, focusing on showing how gravity acts on objects, so that students intuitively understand that "gravity causes objects to fall faster and point towards the ground".

Add a sentence before the above cue word:

Use Three.js to generate a 3D animation of the concept of gravity. Be careful to keep the animation within boundaries, make sure the physics are accurate, and use OrbitControls to see different views of the animation.

Get the following animation: