1. Definition

Texture Mapping is the process of applying a 2D image (texture) onto a 3D surface to give it detail and realism.

• Instead of modeling every small detail (like bricks, wood grain, or fabric), a texture image is “wrapped” onto the surface.
• Introduced by James Blinn in the 1970s, texture mapping is a fundamental technique in 3D graphics, games, and simulations.

2. Concept

• Each vertex of a 3D model is associated with texture coordinates (u, v).
• The texture coordinates map a point on the 3D surface to a pixel in the texture image.
• During rendering, the color of the pixel is taken from the texture and applied to the surface.

3. Steps in Texture Mapping

1. Load Texture

   • Load a 2D image (bitmap, PNG, etc.) into memory as a texture map.

2. Assign Texture Coordinates

   • Each vertex of the polygon gets (u, v) coordinates corresponding to the texture image.
   • Coordinates are usually normalized: (0 \le u,v \le 1).

3. Rasterization

   • For each pixel on the polygon:

     • Interpolate (u, v) coordinates.
     • Sample the texture color at that coordinate.
     • Assign the sampled color to the pixel.

4. Optional Enhancements

   • Filtering: Bilinear or trilinear filtering to smooth textures.
   • Mipmapping: Precomputed lower-resolution textures to reduce aliasing.
   • Environment mapping: Reflective or shiny surfaces.

4. Types of Texture Mapping

5. Applications

1. Games and VR – Adding realism to objects and environments.
2. Simulation – Terrain rendering, satellite imagery.
3. Movies & Animation – Surface details for characters and props.
4. CAD & Visualization – Materials like wood, metal, or glass.

6. Advantages

• Reduces geometry complexity; you don’t need detailed polygons.
• Provides realistic surface appearance quickly.
• Compatible with hardware acceleration in GPUs.

7. Summary Table

Key Points:

• Texture mapping = 2D image “wrapped” on 3D surfaces.
• Vertex texture coordinates (u, v) guide where to sample the texture.
• Widely used in real-time rendering, animations, and simulations.