A Texture Map is a 2D image applied to the surface of a 3D model to add visual detail such as colour, roughness, normals, or emissive properties without increasing polygon count. Texture maps are indexed via UV coordinates that establish a correspondence between surface points and image pixels. They are a foundational component of real-time and offline rendering pipelines.
Overview
- Texture maps allow artists to bake fine surface detail into images, keeping polygon counts manageable.
- A Material typically bundles several texture maps into a coherent shading model (e.g., PBR metallic-roughness).
- Mipmap pyramids provide level-of-detail filtering to reduce aliasing at distance.
- Standards such as glTF define how texture maps are packaged within 3D Asset containers.
Key Aspects
- UV Unwrapping: projecting 3D surface onto 2D plane, stored as per-vertex UV coordinates.
- Compression formats: BC (DXT), ASTC, and ETC reduce GPU memory footprint.
- PBR channels: albedo, normal, roughness, metallic, occlusion, emissive.
- Atlasing: packing multiple objects’ UVs into a single texture to reduce draw calls.
Mechanisms
- During rendering, the GPU samples the texture at interpolated UV coordinates per fragment.
- Bilinear and trilinear filtering smooth transitions between texels and Mipmap levels.
- Normal maps encode surface perturbations in tangent space, simulating lighting on micro-geometry.
- Texture streaming systems load mipmaps on demand to manage VRAM budget in open worlds.
Applications
- 3D Content Creation for games, film, and Metaverse platforms.
- Augmented Reality overlays requiring realistic surface appearance on physical objects.
- Virtual Reality environments demanding high visual fidelity at low latency.
- Real-Time Rendering in web XR and mobile applications.
- Digital twin visualisation and product configuration systems.