3D Rendering of Packaging to Show Different Sizes of the Same Reference

When a single reference is sold in several sizes, the challenge of the render is not to repeat the image: it is to make the range read as a coherent family and to make the difference in scale believable. This tutorial walks through the process of rendering a range of packaging formats from a single base model, starting with what you need to gather before modelling.

What you need before you start

For a packaging 3D render with different sizes you need, at a minimum, the exact dimensions of each format (height, width and depth), the dieline or die-cut plan for each one, and the final artwork with its versions for each size. If the pack is plastic, glass or metal, add the technical drawing or CAD file with the radii, the wall thickness and the closure lines.

It also helps to define which elements change between formats and which do not. Imagine a range of three jars of 250 ml, 500 ml and 1 l: the lid may stay the same on the two smaller ones and change on the largest, the label may grow proportionally or reorganise its content, and the legal text usually changes in point size. Noting these rules from the start avoids rebuilding scenes.

Finally, clarify the end use: catalogue sheet, ecommerce, distributor presentation or campaign. Each one determines the framing and the number of images you will need per size.

Step 1. Build a parametric base model

Instead of modelling each format from scratch, you build a base model whose proportions can be adjusted. That way, the corner radius, the wall thickness or the neck height are kept with judgement and are not distorted by simple scaling.

Scaling a pack uniformly is the classic trap. If a 1 l jar is just the 250 ml one multiplied up, the thread, the plastic thickness and the bevel of the lid end up out of proportion, because in reality those parts do not grow equally. The right approach is to separate the parts that scale (the body) from those that stay the same (closure, thread, edges) and adjust them for each size according to the drawing.

In round numbers: if the body goes from 10 to 20 cm in height, the standard lid still measures 4 cm in diameter. That relationship is what the eye uses to understand real size.

Step 2. Apply materials and graphics per format

With the geometry resolved, materials and artwork are assigned. Materials must be identical across the whole range: the same plastic, the same label finish, the same roughness. If they change for no reason, the customer will perceive products of different quality.

The graphics demand more attention. A label adapted to a large pack is not an enlarged version of the one for a small pack: the type size, the margins and the hierarchy change. Each artwork is applied at its real format and legibility is checked at the intended camera distance.

If the range includes embossing, varnish or foil, the treatment must be replicated with the same logic at every size; this link on special print finishes explains how they are represented. And for the nuances that influence how the product is perceived, it is worth reviewing the quality perception details of packaging.

Step 3. Set a common camera and lighting

For the sizes to be comparable, the scene must be the same: the same lens, the same angle, the same camera height and the same light. Changing any of these parameters between formats alters the perception of volume and ruins the comparison.

A medium or long focal length, with little distortion, is the usual choice in product work because it respects proportions. Shadows and reflections must also match: a larger pack casts a longer shadow, and that is correct, but the direction and hardness of the light must not change.

A useful technique is to build the scene once and swap the model inside it. That way each size inherits exactly the same environment and the visible differences are only those of the product.

Step 4. Render the individual sizes

Each format needs its individual image on a plain background, with the same relative framing. There are two possible criteria: keep the same height in pixels for all of them, so they appear at the same size, or respect the real scale, so the larger one takes up more of the frame. The first favours uniform catalogue sheets; the second, comparison.

It is best to decide according to the channel. In an ecommerce store, where thumbnails are shown in grids, uniformity usually works better; in a distributor presentation, real scale communicates the range better. If the pack has several relevant sides, the same set of angles is repeated across all sizes.

Finally, check that the whites, the contact shadows and the reflections are at the same level across images, since small differences become noticeable when they are placed in a row.

Step 5. Compose the product line render

The family image places all the formats together. Here relative scale is what matters most: they are arranged from smallest to largest, with constant spacing and a perspective that does not hide one behind another. Staggering them in depth, with the largest behind or alongside, adds rhythm, but overlaps that cover labels must be avoided.

It is rendered as a single scene, with all the models present, so that the shadows and reflections between packs are calculated naturally. Compositing in retouching from separate pieces is possible, but it forces you to handle cast shadows and mutual reflections manually, and it tends to show on glossy surfaces.

If the range is broad, it is worth preparing several compositions: a complete one, another with the best-selling formats and another per sub-family, to suit different media.

Step 6. Set the scene and review the coherence of the range

Lifestyle images place each size in a context of use: a small format in a bathroom or in a handbag, the large one in a pantry or a workshop. Context helps convey the scale and intended use of each format, something a plain background cannot provide.

This is the approach we follow in our service, where plain-background and lifestyle images keep colours, finishes and aesthetics coherent across all the pieces. If you have a range yet to be manufactured, you can request a 3d rendering quote with your formats and artwork.

Before considering the work finished, all the images are reviewed together: the same tones, the same light intensity, the same sharpness and the same materials. A useful check is to place the thumbnails on a single sheet and see whether any of them stands out for something other than its size.

A rule that works as a control: if on a sheet with all the formats the only visible differences are the size and the label content, the range is well resolved. With three example formats, 250 ml, 500 ml and 1 l, and the same 4 cm lid on the two smaller ones, any variation in light, material or closure proportion is a coherence failure, not a design decision.

Frequently asked questions

Can the same 3D model be reused for all sizes?

Yes, as a starting point. A base model is used and the parts that do not scale equally, such as closures, threads and thicknesses, are adjusted. Scaling the whole model uniformly produces unconvincing proportions.

Is it better to show the sizes at the same height or at real scale?

It depends on the use. The same height gives uniform sheets for a catalogue or online store; real scale communicates the difference between formats better, for example in a sales presentation.

What material should I provide to render a range of packs?

The dimensions of each format, the drawings or dielines, the final artwork per size and, if they exist, the CAD or 3D files of the pack. Indicating which parts stay the same and which change between formats speeds up the work.