Block Out the Room Before AI Films It

What You Get

The most common problem with AI-generated indoor video is that the space falls apart. One second the window is on the left, and the next it has moved to the right. A person walks through a desk. A camera move that was supposed to circle around from the side ends up circling the wrong way. A creator in Japan shared a fix: first, block out the room in Blender with gray boxes and simple figures, and set the camera path. Then use that previz (a rough rehearsal render) as the reference for Meta Muse to generate a realistic video. The post includes 3 prompts you can copy and paste directly.

Let AI handle everything from the floor plan to the final check. You only sign off at two checkpoints: whether the floor plan is right, and whether the first and last frames of the gray blockout are right.

Why Block Out the Room First

A text description alone forces the video model to guess what the room looks like in every frame, and the guesses drift apart over time. The gray blockout settles those answers first:

• Lock positions first: The desk direction, the wall the window is on, and the cabinet at the end of the hallway are all set in the blockout. The video model paints from it, so it doesn't have to guess.

• Walk the camera through first: The camera's start point, its path, and where it stops are all set in the blockout. Check the movement before you generate anything.

• Cheap to fix: If a position is wrong, edit the blockout and re-render in a few seconds. Regenerating the video directly means waiting longer and spending more credits.

Step 1: Get Two Tools Ready

• An AI assistant that can drive Blender: for example, Claude Code with BlenderMCP installed. It can place objects and cameras in Blender directly, then render the frames.

• Meta Muse: draws the floor plan and generates the final realistic video. If you want your assistant to call your Muse directly, follow the guide to connecting Muse to Claude Code to install Muse4AI.

Step 2: Draw the Floor Plan and Confirm It Before Moving On

Describe the scene, the object positions, the character's path, and the camera path in one go. The block below is the master task list for the whole method:

The last point matters most. The video model sometimes flips the camera direction, and changing the prompt often doesn't fix it. The real fix is to go back to the gray blockout, correct the positions, and produce new reference frames.

Step 3: Check the First and Last Frames of the Gray Blockout

When the gray blockout comes back, check only three things:

1. The landmarks (windows, cabinets, columns) are where the floor plan puts them.

2. The character's position and walking direction are right.

3. The camera's starting and ending angles are what you wanted.

If something is off, say so directly, such as "the window should be to the right of the camera" or "the last frame should shoot from behind her," and ask for a re-render.

Step 4: Check the Video Frame by Frame After Generating

After the video is generated, have the assistant put the check results in a table so you can see at a glance what still needs fixing:

Pull one frame every second from the generated video and compare each one with the floor plan and the previz, item by item, in a table:
Check item (windows, cabinets, columns, character path, camera direction) | What the previz shows | What the video shows | Matches or off.
For any item that is off, first say how you plan to change it in Blender, and wait for my approval before making changes.

In this example, the author also used a different video tool to swap the character for a specific one. This step is optional. Do it only after the space and camera are both right.

Notes

• Only about 10 seconds at a time: Split longer videos into segments. Run each segment through "blockout, generate, check," and check how the segments connect against the floor plan.

• Don't skip the check: The video model sometimes flips the camera direction. The author specifically warned about this, so the check is a required step.

• The blockout doesn't need to look good: Boxes and figures are enough. Time spent on textures is wasted, since the video model handles texture.

• Credits get used up: Every generation counts against your own Muse account credits, so confirm the positions before generating.

References

• Blender official website

• Muse4AI GitHub repository