• Texture Mapping
  • Texture Maping (GL)
    • Parameters
    • Simple Demo
• Object loading
  • 3D model files
    • OBJ file (.obj)
    • MTL file (.mtl)
  • Simple Demo
• 3D model with texture mapping
• Section Demos

Texture Mapping

• Pasting and image on surfaces
• Map 2D image(pixels) to 3D object(Points)
• Produce realistic models
• Simple solution to avoid complex surface manipulation.

Texture Maping (GL)

Parameters

• Texture coordinates & object coordinates.
• Interpolation
• Wrap mode

//Enable Texture Mapping 
glEnable(GL_TEXTURE_2D);
//Make Texture using the image
glGenTextures(1, &_textureId)
glBindTexture(GL_TEXTURE_2D, _textureId);
glTexImage2D(...);
//Setting parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//Adjusting Texture Coordinates
glTexCoord2f(...)

Simple Demo

• Texture disabled

• Texture Enabled

• Adjusting Texture Coordinates

• Another Texture

Object loading

3D model files

• Created 3D models can be saved in different formats (STL, OBJ, 3DS, … )
• 3D Model is a list of 3D points that represent the model
• In this tutorial we will use OBJ format

OBJ file (.obj)

• List of geometric vertices
• List of vertices normals
• List of texture coordinates

MTL file (.mtl)

• Define material properties (Ambient, Diffuse, Specular, … )

• Define texture maps (images)
• Used to style the object

Simple Demo

• Loading model

• Selection menu to switch the model

• Adjusting materials

• Free 3D models here

for example this is the apple ibook model

3D model with texture mapping

Example

2D Image	3D Model	Result
+		=

Note:

Models with texture images are not required in this course.

Section Demos

Demos are available here.