Updated 2026-10-05
Run gemini extensions install https://github.com/JasmyLab-JANCTION/janction-render. The extension registers the remote MCP server https://render.janction.jp/mcp; type /mcp to see the 12 tools. Ask for a scene and Gemini writes the bpy script, previews it in a few GPU seconds and renders the final frames or an MP4. Free beta.
# as an extension (recommended)
gemini extensions install https://github.com/JasmyLab-JANCTION/janction-render
gemini extensions list
# or by hand, in ~/.gemini/settings.json
{
"mcpServers": {
"janction-render": { "httpUrl": "https://render.janction.jp/mcp" }
}
}
Streamable HTTP servers use httpUrl in Gemini CLI. Inside the CLI, /mcp lists the server and its tools; the first call opens the OAuth consent page (a free key is created). Antigravity CLI reads the same extension format; Antigravity's IDE lists MCP servers under its MCP settings, where the same URL can be added.
Using JANCTION Render, build a glossy red cube rotating on a grey floor and show me a 4-frame preview. If it looks right, render 24 frames at 1280x720 as an MP4.
To render a .blend or 3D file that is on your computer, drop it at /upload to get a 12-hour link (no sign-up) and tell the AI "Render this file: <link>". To test the connection first: "Render a preview of https://render.janction.jp/samples/cube_scene.py".
scene_info reads the scene without rendering: cameras, frame range, objects, missing files.render_preview renders 1-4 frames at 720p in a few GPU seconds and returns the image, so the agent can look, fix the script and try again.render_estimate says how long the final render takes ("about 3 minutes") and whether it fits today's free quota.render_final renders the frames on GPUs and joins them into an MP4; render_status reports the remaining time; render_download returns the files or links.| job | GPU time | note |
|---|---|---|
| preview, 4 frames (720p split in 4 tiles, 16 samples, denoised) | about 4 s | round trip about 8 s; the image comes back inline |
| final, 24 frames at 1280x720, 64 samples → MP4 | about 60 s | measured 2026-09-30 / 10-01 (59 s and 58 s) |
| final, one 1920x1080 frame at 128 samples | about 11 s | the estimator's baseline; heavy scenes take longer |
These are individual observations of simple scenes (2026-09-30 to 10-01 UTC, NVIDIA RTX PRO 6000 Blackwell Max-Q Workstation Edition, 96 GB). The 4-GPU-second example used a rotating cube, four 640x360 tiles and 16 samples. GPU time includes Blender startup and scene loading; it is distinct from completion time including queue and transfers. See conditions, round trips and reproduction files. These are not speed guarantees.
render_estimate gives the number before rendering; once a scene has been rendered once, the estimate uses that scene's own measurement.
/mcp shows the server as disconnected: check the key is httpUrl (not url, which means SSE) and that the consent page was completed.gemini extensions update janction-render, then restart the CLI.quota_exceeded / beta_limit: see the limits below.gemini extensions uninstall janction-render
or delete the entry from settings.json. Revoke the key with POST https://render.janction.jp/v1/keys/revoke if needed.
Free beta (as of 2026-10-01): 10 GPU-minutes per key per day (20 per network), final renders up to 240 frames at 1080p. Quotas reset at 00:00 UTC (09:00 JST). New jobs exceeding the quota are rejected with HTTP 429 quota_exceeded and resets_at; they are not queued for the next day. Resubmit after the quota resets. No sign-up: connecting creates a key. Inputs and results are deleted 24 hours after last use and never used for training. Paid plans will be announced on this site and in llms.txt before they start.
The extension installs from the GitHub URL today; gallery listings are self-reported and we have requested inclusion in the Antigravity MCP Store (2026-10-05).
No. Custom MCP servers are available in Gemini CLI and Antigravity, not in the consumer Gemini app, as of October 2026.
Yes: add the same URL as an MCP server in Antigravity's MCP settings, or use the CLI extension.
JANCTION Render v0.4.17 · JasmyLab Inc. · Updated 2026-10-05 · Tested with Blender 5.0, JANCTION Render 0.4.17 · 日本語