How to Generate a 3D Model from a Single Image with AI

You can now generate a fully textured 3D model from a single 2D image using AI. In RandomSeed, the Trellis model takes any image — a photo, a rendering, an AI-generated picture — and produces a 3D mesh with textures in under a minute. No 3D modeling skills required.

What Is Image-to-3D Generation?

Image-to-3D generation uses AI to infer three-dimensional geometry from a flat 2D image. The model analyzes the shape, depth cues, lighting, and texture of your source image, then reconstructs a 3D mesh that matches the original subject from all angles.

Trellis is the model that powers this in RandomSeed. It handles the hard part — figuring out what the back of your object looks like when you only showed it the front. The output is a textured 3D model you can rotate, inspect, and export.

Step-by-Step: Generate a 3D Model in RandomSeed

Step 1: Open the Studio and Create a New Project

Go to the studio and create a new project or open an existing one. The spatial canvas is where all your generations live.

Step 2: Generate or Upload Your Source Image

You need a source image to convert to 3D. You have two options: upload an existing image, or generate one using an image model like FLUX. If you are starting from a text description, generate the image first with FLUX Dev or FLUX Pro, then use that as your 3D source.

Step 3: Send the Image to Trellis

With your source image on the canvas, connect it to a Trellis node. You can drag a connection from the image output to the Trellis input, or right-click and send it directly. Trellis will use the image as the basis for 3D reconstruction.

Step 4: Wait for Generation

Trellis typically takes 30 to 60 seconds to generate a 3D model. The model is inferring geometry, generating textures, and building the mesh — more complex subjects may take slightly longer. You will see a progress indicator on the canvas while it runs.

Step 5: Download Your 3D Model

Once generation completes, you can preview the 3D model directly in the studio by rotating and zooming. When you are satisfied, export in GLB or OBJ format. GLB is the standard for web and game engines. OBJ works with traditional 3D software like Blender and Maya.

Tips for Better 3D Results

The quality of your 3D model depends heavily on the quality of your source image. Here is what makes a good input for Trellis:

• Clear subject — A single, well-defined object works far better than a cluttered scene. Trellis needs to understand what it is reconstructing.
• Good lighting — Even, diffuse lighting gives Trellis the most information about surface shape and texture. Harsh shadows can confuse depth estimation.
• Simple background — A clean or neutral background prevents the model from incorporating background elements into the mesh.
• Front-facing or 3/4 view — These angles give the model the most information to work with. Extreme angles or heavy occlusion make reconstruction harder.
• Remove the background first — Run your image through RMBG before sending it to Trellis. Background removal isolates the subject cleanly and consistently produces better 3D results.

Building a 3D Pipeline

The most reliable way to go from an idea to a 3D model is to chain three models together in a pipeline:

1. FLUX — Generate a high-quality image from your text prompt
2. RMBG — Remove the background to isolate the subject
3. Trellis — Convert the clean image into a 3D model

In RandomSeed, you can wire this up as a pipeline on the canvas. Connect the output of each node to the input of the next, and the entire chain runs automatically when you trigger it. Change the prompt, and the whole pipeline reruns with the new source image.

This gives you effective text-to-3D generation, even though Trellis itself works from images. The pipeline handles the translation.

Export Formats and Next Steps

Trellis outputs 3D models in two standard formats:

GLB is the modern choice for most use cases. It is a single binary file that includes geometry, textures, and materials. If you are building a website with Three.js or React Three Fiber, GLB loads directly. If you are bringing assets into a game engine, GLB is natively supported by Unity and Unreal.

OBJ is the legacy standard. Use it when your downstream tool does not support GLB, or when you need to do heavy editing in dedicated 3D software before final use.

When to Use AI 3D Generation

AI-generated 3D models are not replacing handmade assets for AAA games or feature films — not yet. But they are immediately useful for several practical workflows:

• Rapid prototyping — Quickly generate 3D concepts before investing in manual modeling. Test ideas in minutes instead of days.
• Game assets — Populate indie game scenes with AI-generated props, background objects, and environment elements.
• E-commerce product views — Create 3D product previews from product photos. Let customers rotate and inspect items before purchasing.
• Social media 3D content — Generate eye-catching 3D visuals for posts and stories without needing 3D modeling expertise.
• Web experiences — Add interactive 3D elements to landing pages, portfolios, or product pages using GLB models with Three.js.

For production assets that need precise geometry, use AI generation as a starting point and refine the mesh in Blender or your preferred 3D tool.

Try It in the Studio

The fastest way to see this work is to try it. Open the studio, generate or upload an image, and send it to Trellis. You will have a 3D model in under a minute.