Look: materials, light and camera

Scene parameters and comparisons to guide changes.

Use this guide with an editable copy of the radio. Dimensions are scene units for artistic composition. Save a version before editing. Study images and the clip are available separately in the course; this document gathers explanations and parameters.

Distinguish color, roughness and metal

The same shape can resemble plastic, rubber or metal depending on its response to light. In Principled BSDF, Base Color defines base color, Roughness controls reflection spread, and Metallic changes between nonmetallic and metallic behavior. None works independently of illumination and the reflected environment.

In this project, teal paint uses Metallic=0 and Roughness=0.3; rubber feet use Roughness=0.8; the antenna uses Metallic=1 and Roughness=0.2. The rim uses 0.85 as an intermediate artistic choice, not a measured metal alloy. Try one material at Roughness 0.2 and 0.7 while keeping camera and lights fixed: the specular highlight changes concentration and appearance.

Do not darken the color whenever a reflection looks bright. First identify whether you are seeing base color, reflection or exposure. A small palette organizes reading: teal body, ivory panel, dark interior, coral accent and metal. Shared materials change several parts together; duplicate a material to edit only one.

Light to reveal volume and separate planes

The key light establishes dominant volume; fill reveals regions that would otherwise remain dark; a rim light helps separate the outline from the background. These are compositional roles, not a requirement to use exactly three lights. Start with one and add another only when you know what is missing.

In the file, Key is at (−3, −4, 7), power 700 W and size 5; Fill is at (4, −1, 4), 350 W and size 4; Rim is at (1, 4, 6), 800 W and size 3. They are Area lights aimed at the radio. Values belong to this example’s scale and renderer; they are neither a universal recipe nor physical lamp settings.

A larger source relative to the object tends to produce softer shadow transitions. Changing distance affects intensity and coverage. Disable one light at a time to understand its contribution. If metal seems shapeless, inspect what it reflects; increasing its color does not replace an environment or light that reveals the surface.

Choose projection and framing for the intent

A perspective camera makes distant objects appear smaller and parallel lines converge depending on orientation. Orthographic projection preserves apparent scale with depth, favoring a graphic presentation. Both can communicate form; choose according to the effect you want.

This project uses an orthographic camera at (6, −10, 6.2), aimed at (0, 0, 2.05), with Orthographic Scale=6.5. It shows front, side and top. Scale controls framing extent: increasing it makes the object appear smaller without changing geometry. The image is square; a vertical format requires recomposition.

Check that antenna, feet and shadow fit the border. For a turntable animation, inspect intermediate positions too: the widest projected extent may occur after the first frame. Do not adjust only the opening image. If switching to perspective, distance and focal length interact; moving the camera closer while changing lens does not produce the same perspective as keeping it far away.

Understand why color changes between material and image

A material color value does not promise the same rendered pixel. Illumination, reflections, shadows, exposure and display transform contribute to the image. This project uses AgX to present the scene’s brightness range. Highly illuminated areas may lose saturation; changing the transform changes the result without touching the material.

Compare versions with the same camera, lighting, exposure and transform. If you change material and color management together, you cannot tell which caused the effect. For a brand palette, evaluate the final image in its delivery format while considering the display; an illuminated 3D color is not automatically equivalent to a flat layout fill.

PNG is useful for checking a finished image; files intended for linear compositing follow another workflow and may look different in an ordinary viewer. For this first project, use the PNGs and file settings as a consistent reference. Avoid stacking saturation corrections in several applications without recording changes.

Compare versions by changing one decision at a time

The three supplied studies answer different questions. The no-bevel version shows hard edges; the neutral beveled version shows rounded-edge effects; the colored image adds final materials. Camera and composition remain, letting you observe each change’s contribution.

Compare body outline and feet first, then highlight strips along edges. Finally, notice how the light panel and dark speaker organize attention. This does not claim that “more rounded” is always better; it shows what the decision does in this scene. A severe industrial object or deliberately angular aesthetic may need another solution.

For your experiment, save two images with descriptive names such as body-bevel-018 and body-bevel-008. View them at their intended display size. If a detail is invisible, decide whether it deserves editing and rendering cost. Useful evaluation identifies the shape, light, material or framing that needs a change.

References

Sources checked 2026-09-26.

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