Adding texture to OBJ files in OpenGL can enhance the realism and visual appeal of 3D graphics. By mapping images onto the surfaces of 3D models, textures can create lifelike details such as wood grain, metal sheen, or fabric patterns. Here's how you can put texture in an OBJ file using OpenGL: 1. Load the OBJ File: Start by loading the OBJ file into your OpenGL application. You can use libraries like Assimp to parse the OBJ file and extract its vertices, normals, and texture coordinates. 2. Load the Texture Image: Next, load the texture image that you want to apply to the OBJ file. This can be a JPEG, PNG, or other image format. You can use libraries like SOIL or STB image to load the image data into a format that OpenGL can work with. 3. Generate Texture ID: In OpenGL, you need to generate a texture ID to represent the loaded image data. This involves creating a texture object, binding it, and setting its parameters such as wrapping mode, filtering, and mipmapping. 4. Map Texture Coordinates: With the OBJ file's texture coordinates and the loaded texture image, you can now map the texture onto the surfaces of the 3D model. This involves specifying the texture coordinates for each vertex, so that the texture can be applied correctly to the geometry. 5. Enable Texturing: Finally, enable texturing in the OpenGL rendering pipeline. This involves setting up texture units, activating the texture, and applying it to the vertices during rendering. With these steps, you can add texture to OBJ files in OpenGL, bringing your 3D models to life with realistic surface details. Whether you're creating a game, architectural visualization, or product design, texture mapping in OpenGL can elevate the quality of your 3D graphics.