What can a 3D render promise and what can't it?
A render reliably shows proportions, layout, heights and the general character of light. It conveys colour, natural stone texture, gloss and reflections unreliably. You should not decide materials from it, but you can decide composition.
The point of a render is to see the room before building and catch mistakes on paper rather than in concrete. But the image is made from a model, textures and lighting settings, and each is an approximation. Below, what you can entrust to a render and what must be checked in person.
Will the colour in the render match the real thing?
No, not exactly. Colour on a screen depends on monitor calibration, colour profile, software settings and the scene's assumed lighting. In a real room colour shifts with window orientation, time of day and neighbouring surfaces.
The same light-grey stone looks cold in north light and warm in the evening under 2700 kelvin lamps. A render shows one lighting setup, usually soft and even. So colours of walls, stone and timber are approved from physical samples, viewed in the room itself, morning and evening, vertical and horizontal, next to other samples. More in the article on approving samples.
A trick that works: place the sample in position, photograph it in different light and compare with the render. If they differ, believe the sample.
What does a render distort in stone and other materials?
It simplifies texture and reflections. Marble in the image gives a lovely but uniform vein, while a real slab has irregular pattern, depth, translucency and patches that cannot be predicted. Polished and bush-hammered finishes look like two different "surface pictures" in a render and in person differ in reflection and warmth to the touch.
Book-matching is a separate matter: a render uses an ideal repeated pattern, whereas real slabs are chosen at the yard and the pattern comes out differently. So important stone surfaces are approved from photos of the specific slabs, not a catalogue image.
Small details are distorted too: joint thickness, chamfer, shadow-gap depth, timber grain, reflections off lacquered fronts. That is what the eye notices in person and does not see in the image. Find out what samples the studio used to build the materials in the model.
How many render options are usually made?
The usual practice is one or two views per room for each concept iteration and a limited number of revisions. The exact number is written into the contract, because a render costs time and money. More options do not mean a better decision.
A few well-considered views serve better than dozens of pretty ones. For a living room a view from the entrance, one from the window and an evening version with lighting are enough. For a kitchen, a view of the island and one of the tall units. For a bathroom, from the door and towards the wet area. Ask for eye-level views, not top-down wide-angle shots, which give a false sense of space.
If the concept changes, agree in advance how many render revisions are in the price. Endless revision of the picture without revising decisions gains nothing.
How do I use a render to make decisions?
Use it for proportions, furniture placement, sightlines, height of cabinets, positions of light fittings and the overall balance of light and shade. A render conveys these well if the model was built to exact dimensions.
Compare the image with the dimensioned plan. If the studio models from a survey, the render reflects real proportions. Check how doors open, whether cabinets obstruct passage and where your eye falls as you enter. In the tall Eixample rooms a render helps judge how cornices, columns and door heights read.
Ask for day and evening versions of the same scene. A room reads differently by day and at night, and that difference strongly affects the choice of fittings and wall colour. Remember that the evening view shows the lighting intent, not a promise. You will set brightness and colour temperature on site.
When do I need a physical mock-up, and can I build from a render?
A mock-up is needed where detail decides: stone layout, a complex junction, a hidden door, light in a niche, a decorative panel. You cannot build from a render alone: it has no dimensions, details or specification.
A mock-up is a full-size fragment: a one-metre panel with stone, joint and light; a panel sample with its routing; a door with hinge and stop. It is made in a workshop or on site and viewed in real light. It costs little compared with redoing a finished wall. In our 250 m² children's psychology centre in Eixample there were 24 hidden doors, and each was settled by a detail and a sample, not a picture.
You build from working drawings: dimensions, elevations, details, specification. The render shows the goal, the drawing says how to reach it. If a contractor is given only a render, they are forced to guess, and guessing is expensive.
What should I ask a studio about renders, and how does BCN YARD see them?
Ask what samples the materials in the model were made from, what dimensions it is built on, how many views and revisions the contract includes and which decisions must be confirmed with a mock-up. The answers show how well the studio understands the boundary between a picture and a build.
We run renovation and interior design. We treat a render as a tool for deciding composition, and approve materials and details from samples and drawings. One person responsible for the site stays in touch in Spanish and Russian, payments follow stages under the contract and we give the exact price after the visit and measurements.
Frequently asked questions
Will the colour in the render match the real thing?
Not exactly. Colour on a screen depends on monitor calibration, scene settings and assumed light, and in a room on the window and time of day. Approve colour and texture from physical samples viewed in the room itself, morning and evening.
How many render options are made?
Usually one or two views per room per concept iteration and a limited number of revisions. The number goes in the contract. A few well-considered eye-level views, including an evening one, serve better than dozens of pretty pictures. Agree in advance how many render revisions are included.
When do I need a physical mock-up?
When detail decides: stone layout, a complex junction, a hidden door, light in a niche, a decorative panel. A full-size mock-up is made in a workshop or on site and viewed in real light. It costs less than redoing a finished wall.
Can I build from a render without drawings?
No. A render has no dimensions, details or specification. You build from working drawings: dimensions, elevations, details and a materials specification. The render shows the goal, and a contractor without drawings has to guess, which is expensive. A render does not replace the drawings.