Guide · · 7 min read
Edit an interior without rebuilding it: remove, add, replace
Client comments are almost never about the architecture. They are about the sofa. Three modes, one mask, and a revision round that ends the same afternoon.
Look at a week of client comments on interior visuals and you will find the same list every time. The sofa is too big. Can we see it without the rug. What is that on the wall. Could the pendant be black. None of it is about the building, all of it has to be answered, and in a classic pipeline every one of those sentences is a new render.
The object tool answers them on the image you already have. Three modes — remove, add, edit — and one skill, which is masking. The lesson below is fourteen minutes and worth all of them; this is the same material in the order you will need it.
Masks first, because everything else depends on them
A mask tells the tool which part of the image you are talking about. It is the whole job: a good mask makes the three modes feel like magic, and a sloppy one is why an edit comes back with a smear where a lamp used to be.
- Include the object’s shadow. An object without its shadow leaves the shadow behind, floating on the floor with nothing casting it.
- Include its reflection. On a polished floor, a glass table or a mirror, the reflection is part of the object as far as the image is concerned.
- Give the edge a little room. Mask slightly outside the silhouette rather than cutting exactly along it — the tool needs somewhere to blend.
- Mask one thing at a time. Two chairs and a table in one mask is one instruction with three answers, and you will not like at least one of them.
Remove
The simplest mode and the most useful in a revision round: mask it, remove it, and what was behind it is filled in — the floor continues, the wall continues, the skirting lines up. Use it to clear a room back towards the architecture, which is what a client usually means when they say an image feels busy.
The check afterwards is always the same: look at the floor where the object stood. Continuous material, no ghost shadow, no seam in the pattern.
Add
Mask where it goes, not what it is
In add mode the mask is a location. Put it where the object should sit, at roughly the size it should be — that footprint is how the tool knows both the scale and the perspective it has to obey.
Say what belongs there
A piece of furniture, a plant, a light fitting, artwork. The room around it — its floor, its light, its materials — is already in the image, so what comes back is lit by the room rather than pasted onto it.
Check the three tells
Contact shadow where it meets the floor, perspective lines that agree with the room, and reflection if the floor is polished. Those three are what separate an added object from a sticker.
Run variants in parallel
Three sofas at once is one pass and one comparison, instead of three rounds of “nearly”. This is the fastest way to close a furniture conversation.
Edit
Edit mode keeps the object and changes it — the same chair in a different upholstery, the same pendant in black, the same joinery in oak instead of walnut. It is the mode to reach for when the client likes the composition and disagrees with a specification, which is most of the time. Because the object stays put, the frame stays the frame everybody already agreed on.
If what needs to change is the material of a surface rather than an object — the floor, a whole wall — that is the materials question and it has its own habits.
The window is a different tool
One thing in an interior is not an object: what is outside it. A white void behind the glass is the most common interior render failure there is, and the view outside tool exists for exactly that — a real view through the window instead of a blank one.
What this does to a revision round
The published figure for a ten-option revision round is 41 minutes and $6.60, against one to two days on a render farm and one to two weeks through an outsourced studio. That gap is made of exactly this: edits on a finished image instead of re-renders. The benchmarks page has the method and the caveats.
“AlphaRender has become an essential part of my interior design workflow, significantly speeding up the revision process while preserving the original composition and proportions better than any other AI tool I have used.”
Kateryna Shumikhina, CEO & Founder, k3nstudios.com
- 3
- modes: remove, add, edit
- 41 min
- a ten-option revision round
- 14:16
- the lesson, end to end
Two neighbours finish the interior set: relighting without re-rendering, and the exterior version of this tool in the people and entourage guide.
Questions we get
- Can I remove furniture from a render I have already made?
- Yes. Mask the object — including its shadow and any reflection — and remove it; the floor, wall and skirting behind it are filled in.
- Can I add an object that was never in the model?
- Yes. In add mode the mask marks where it goes and at what size, and the object is generated lit by the room it is standing in.
- How do I change a material without changing the object?
- Edit mode keeps the object and changes its finish — the same chair in a different upholstery, the same joinery in a different timber.
- Why does my edited object look pasted in?
- Check the contact shadow, the perspective and the reflection. A missing contact shadow is the usual cause, and it normally means the mask did not include the shadow of what was there before.
