Seven Capture Habits That Wreck an Indoor Gaussian Splat

Every flaw in an indoor Gaussian splat starts at capture. Blur, ghost rooms and holes in the floor are rarely a processing fault, and they are almost never fixed by waiting for a better reconstruction. A clean interior splat comes from a handful of habits on site.

Here are the seven that do the most damage, why each one hurts, and the change that costs you nothing. Cleanup after the fact is covered in how to remove floaters from a Gaussian splat scene, and quantity is covered in how many photos a splat needs. This one is about technique.

Why does an indoor Gaussian splat go wrong at capture?

A splat is fitted to your frames. For an indoor Gaussian splat the stakes are higher, because rooms are small. The reconstruction works out where each camera was, then places millions of soft, coloured blobs so the scene matches what every frame saw. Anything that makes frames disagree with each other, such as blur, shifting light or moving objects, gets averaged into smear or floating debris.

Interiors make this harder than outdoors. Rooms are small, so the camera moves a lot relative to the walls. Light is uneven. Surfaces are often glossy, blank or transparent. Each habit below breaks one of those assumptions.

1. Panning fast and shooting blurry frames

Motion blur is the most common cause of a soft interior. A frame smeared by a quick turn gives the camera solver fewer reliable features, and the blur is then learned as if it were a texture on the wall.

Walk slower than feels natural. Turn the camera in a slow sweep, not a snap. If you shoot video, lock the shutter at 1/100 s or faster where the app allows it, and prefer a bright room over a high ISO. Check three random frames at full size before you leave. If any is soft, redo that stretch.

2. Standing in one spot and spinning

A splat needs parallax: the same point seen from different positions. Standing in the middle of a room and rotating gives you one viewpoint and a lot of angles, which is not the same thing. An indoor Gaussian splat shot this way looks right from the centre and falls apart the moment a viewer steps sideways.

Move. Walk a loop around the room's edge, then a second loop closer in at a different height. Keep every wall in frame from at least two positions. A phone clip of an interior works well for this, and video to 3D accepts ordinary MP4 and MOV files, so a slow walkthrough is a valid input.

3. Pointing straight at mirrors and windows

Mirrors are the classic indoor trap. The reconstruction sees a room behind the glass that does not exist, and it often builds that phantom space as real geometry. Research on mirror scenes describes the same failure: 3D Gaussian Splatting often misreads reflections as virtual spaces, which gives blurred, inconsistent renders inside the mirror (Gaussian Splatting in Mirrors, arXiv, 2024).

You cannot remove a mirror, but you can limit its damage.

• Shoot mirrors at an oblique angle, never square on, so your own reflection and camera do not sit in the frame.
• Keep the mirror a small part of each frame rather than the subject of it.
• Cover it with a cloth or move it for the capture, when the room allows.
• Treat windows the same way. Closed blinds or a sheer curtain turn a hard bright rectangle into a soft one.

For listings and venues, deleting the mirror region afterwards in the Splat Editor is a cleaner fix than hoping the solver copes.

4. Mixing light sources and letting exposure drift

A room lit by a window, a warm lamp and a cool ceiling panel changes colour as you walk. Auto exposure then shifts as you pass from a dark corridor to a bright window, and two frames of the same wall disagree about how bright it is. The splat blends that disagreement into patchy tones and a faint flicker as you orbit.

• Turn off the lights you can control and use one colour temperature, or turn them all on.
• Lock exposure and white balance before you start. On most phones, tap and hold on the subject to lock.
• Do the whole capture in one sitting. Daylight moves, and a pass at 10
  and another at 11
  are different scenes.

5. Capturing in low light

Dim rooms push the camera to a slower shutter or a higher ISO. A slower shutter blurs, and a higher ISO adds noise that the solver treats as detail. Low light 3D capture is possible, but it asks you to slow down even more, not less.

Add light first. Open curtains, switch lamps on, or bring a small continuous panel. If the room stays dim, use a steadier grip or a gimbal and walk at half your usual pace. Avoid flash: it lights each frame from a different angle, so the shadows move between frames and the splat cannot settle on one.

6. Leaving people, pets and open doors moving

A splat assumes the world holds still. A person crossing the room becomes a translucent ghost smeared across several metres. A door that swings between passes leaves a half-open fan of floaters.

Clear the room if you can. Close the doors you do not need, and leave the rest at a fixed angle. If someone must be in shot, have them stay put and out of the main path. For the strays that slip through, the floater removal guide covers the cleanup.

7. Skipping corners, thresholds and blank walls

The camera solver anchors on texture. A long white wall, a glossy floor or a doorway you glide through quickly gives it almost nothing to hold. Poses drift, and the scene bends or splits in two at the exact place you hurried.

Slow down at transitions. Pause for a second at each doorway and step through, with the camera still facing where you came from, so the two rooms share frames. On blank walls, pull in objects with texture (a plant, a chair, a poster) or keep a doorframe in view. Capture corners from two angles, and lower the camera for floors and skirting boards.

Which habit fixes which flaw?

What does a good interior capture look like?

A good interior capture is a slow, steady walk with every surface seen from two or more positions, locked exposure, and nothing moving. In practice that is two or three loops of the room at different heights, with a pause at each doorway. It saves far more time in cleanup than it costs on site.

Upload the clip and cloud processing does the rest, running for between 10 and 120 minutes on Captures Studio with no local GPU. The inputs you can control are all on this page. Processing time is not one of them.

FAQ

How slowly should I walk when capturing a room?

Slower than feels natural, roughly the pace of someone looking for a lost earring. If a frame is soft when you pause the video and zoom in, you moved too fast for that light. Slow the turns more than the walking, since rotation causes most of the blur.

Can a Gaussian splat handle mirrors and windows?

Not cleanly. Reflections change with viewpoint, so the reconstruction often invents a phantom room behind the glass. Shoot glass at an oblique angle, keep it small in frame, cover it when possible, and delete leftover geometry in an editor. Closed blinds tame windows by softening the bright rectangle.

Is it possible to scan a dim room without extra lights?

Yes, though you pay for it in sharpness. Use a gimbal or braced elbows, walk at half speed, and keep ISO as low as you can tolerate. If you can open curtains or switch on lamps, do that instead. More light removes the blur and noise problem at the source.

Does the time of day matter for an indoor scan?

It matters when windows are in the room. Daylight shifts in brightness and colour over an hour or two, so a long session produces frames that disagree. Capture the whole room in one short sitting, or close the blinds and use steady artificial light for a consistent result.

Should I use photos or video for an indoor splat?

Either works. Video is faster to shoot and easier to keep evenly spaced, but each frame can be softer. Photos are sharper, though they need more discipline about overlap. For a first attempt, a slow phone video is the simplest way to get a clean result, and photos suit larger rooms.

An indoor Gaussian splat rewards patience and punishes haste. The room you walked slowly, lit evenly and cleared of movement will look sharp from any angle a viewer chooses. The rest is mostly decisions you make before you press record, and the pipeline afterwards is just the part that turns those decisions into a link.