Guide · · 6 min read
Relighting an interior without re-rendering it
“Can we see it in the evening?” used to cost a night on the farm. On a finished render it is a preset, a parallel run and a before/after — about the length of this article.
There is one question that decides how expensive an interior visualisation is, and every client asks it: “can we see it in the evening?” In a classic pipeline that is a new lighting setup, a new render and a new night on the farm. Here it is an edit applied to the image you already have — the geometry, the furniture and the camera stay exactly where they were, and only the light changes.
The lesson below is the whole tool in four and a half minutes. The article is the same thing written down, in the same order, for when you would rather read it than watch it.
Where the tool lives
The lighting tool works on a finished render rather than on the model, so you reach it from a generated image: open the frame you like and pick the tool from the rail. There is nothing to set up first — no light objects to place, no exposure to balance, no render settings to open. If you have never opened the workspace at all, the UI overview lesson is the fifteen-minute tour of every panel.
Three ways to steer it
Presets — start here
A row of lighting conditions that runs from bright daylight through late afternoon to a warm, lamp-lit evening. Pick one and the whole frame is relit together: daylight through the openings, the falloff across the floor, the warmth of the interior surfaces. This is the fastest answer to the client question and it is right most of the time.
Parallel generations — do not choose too early
You do not have to pick one preset and wait. Run several at once and compare them side by side when they land — the whole point of a tool this fast is that you stop guessing which of two moods is better and simply look at both.
A custom reference — when the mood is specific
If the client has a photograph, or the practice has a house look, feed it in as a reference image instead of choosing a preset. The reference carries the character of the light — its warmth, its contrast, where it falls off — onto your room. This is the step to reach for when a preset is close but not the thing you meant.
The before/after check
Every relight can be compared against the frame it came from, and it is worth actually doing rather than trusting the thumbnail. Four things tell you whether a relight is honest:
- Falloff from the window. Light should get weaker as it crosses the room, and the rate it does that at is what makes a space read as deep or shallow.
- Contact shadows. Where furniture meets the floor there should be a dark, tight shadow. If a chair looks like a sticker, the contact shadow has gone.
- Bounce colour. A warm floor throws warm light onto the ceiling. An interior where every surface is lit by the same neutral is lit by a lamp that does not exist.
- What is outside. A relit interior with a blown-out white window reads as a studio set. The view outside is its own tool, and there is a short lesson on it.
What a relight changes, and what it cannot
- It changes: the hour, the direction and warmth of daylight, artificial lighting, contrast, and the mood the room reads with.
- It does not change: the layout, the furniture, the materials or the camera. Those are the things you approved, and a lighting change that moved them would not be a lighting change.
- For anything in the room itself — a sofa that has to go, a wall that should be plaster instead of timber — the object tool is the one you want.
Three mistakes that cost a round
- Relighting a frame whose composition is wrong. Fix the frame first — no hour of the day rescues a camera that is looking at the wrong thing.
- Going straight to a custom reference. Presets take seconds and answer the question most of the time; references are for when you already know a preset will not.
- Showing the client only the evening. The comparison is the argument. Two frames of the same room at two hours sells the room better than either frame alone.
- 4:35
- the lesson, end to end
- 6
- chapters with timecodes
- 0
- geometry changes in a relight
The exterior version of this job — moving the sun rather than the lamps — sits in the environment and natural lighting guide, and the whole set of fifteen lessons plays on the tutorials page.
Questions we get
- Do I have to re-render to change the lighting?
- No. The lighting tool applies to a finished render. The geometry, materials, furniture and camera stay as they were and only the light is regenerated.
- Can I match the lighting of a reference photograph?
- Yes. Instead of choosing a preset, supply a JPG or PNG as a custom reference and the character of its light — warmth, contrast, falloff — is carried onto your interior.
- Can I compare two lighting options side by side?
- Yes. Run several presets as parallel generations and compare them when they land, and use the before/after view against the original frame.
- Does relighting change my furniture or layout?
- No. To change what is in the room — remove, add or replace an object — you use the object tool, which is a separate lesson and a separate article.
