Best 2D-to-3D tools for Codex game devs

One image, two services, two very different meshes

We used the robot concept from the game asset guide — full body, front view, plain background — and sent it to both services on the cheapest configuration each offers. Both completed in about two minutes. The models below are the untextured meshes, rendered here as grey so the geometry is what you are judging.

The dense mesh is not a worse model

A million-and-a-half triangles is what a scanner produces, and it is the right output if your next step is retopology in a modelling package. It is the wrong output if your next step is dragging the file into an engine, where it will cost you memory and frame time for detail nobody sees. The mistake is not picking the cheaper service; it is not saying what the model is for.

Both services accept a polygon budget in the call — a target count and a face limit — and both accept a remesh flag that rebuilds the surface at that budget instead of decimating it afterwards. Saying "under 30,000 triangles" in your request is one clause, costs nothing extra, and is the single change that turns a generated model into an asset. Without it you are paying for geometry you will spend an evening removing.

Triangles or quads decides your file format

The topology option is not only about the mesh. In our runs, asking for triangles returned a .glb — the format a browser, a viewer, or most engines will open directly. Asking for quads returned an .fbx, which is what a modelling package wants and what a plain viewer will not show you. Pick by where the file is going: straight into the engine, ask for triangles; through a modelling pass first, ask for quads and expect to open it in that tool.

What the input image should look like

1. Front view, standing straight

   Arms slightly away from the body, weight even. A dramatic three-quarter pose gives the model less to infer from and bakes the pose into the mesh, which you then cannot undo.

2. Plain background, no shadow

   Anything behind the character is geometry the service has to decide about. A flat white or grey field with no cast shadow gives the cleanest silhouette.

3. Whole subject in frame

   Feet and hands included. Whatever is cropped out of the image is missing from the model, and there is no second pass that fills it in.

4. No text or logos on the character

   Lettering becomes noise on the surface. Keep insignia for the texture pass, which you will most likely do in your own tool anyway.

What still needs a human afterwards

A generated mesh is a starting point, not a finished asset, and it helps to know which jobs it does not do. It has no UV layout you would want to hand-paint on, no material breakdown, no collision shape, and no level-of-detail chain. For a background prop none of that matters. For a hero character that the camera gets close to, the generated mesh is best treated as a sculpt to retopologise over rather than as the thing you ship.

The honest test is scale. If you need one statue in a courtyard, generating it at a sensible budget and dropping it in is minutes of work and cents of cost. If you need forty props with a consistent look and a shared material setup, the per-model savings stop mattering and the pipeline work in front of you is the same as it always was. Use this to fill a scene quickly, not to replace the part of the job where an artist decides how the scene is built.

Running it from Codex

Codex can inspect the returned file, report its triangle count, and convert or decimate it locally for nothing — but it cannot generate the mesh. The Skill installed with the CLI adds the 3D generation capability to the same session, priced per run, and the model lands as a file in your project. Multi-image input is available too, if you have several views of the same subject.

Set it up once

npm install --global @actionway/cli@latest
actionway init
mkdir -p "$HOME/.codex/skills"
cp -R "$HOME/.actionway/skill/actionway" "$HOME/.codex/skills/actionway"

You need Node.js 20 or newer and an Actionway account. Claude Code users copy the same folder into ~/.claude/skills/actionway instead, and both routes reach the same catalog and the same wallet — the get started page lists the steps per client side by side.