IT2202 Textures, Lighting, and Shadows: Understanding Texture Mapping

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What are textures in the context of three-dimensional scenes?

Shadows applied to surfaces of geometric shapes
Colors applied to surfaces of geometric shapes
Lighting applied to surfaces of geometric shapes
Images applied to surfaces of geometric shapes (correct)

How many texture coordinate points are specified for the triangle in the given example?

5
3 (correct)
4
2

What does a (0,0) texture coordinate represent for a vertex in OpenGL?

Top-left side of the texture
Bottom-left side of the texture (correct)
Bottom-right side of the texture
Top-right side of the texture

What is the default behavior of OpenGL if texture coordinates are specified out of the range 0 to 1?

Repeat the texture images (A) Signup and view all the answers

How does OpenGL solve the issue of texture (texels) not being precisely the same size as the pixels in the rendered image?

Mipmapping (A) Signup and view all the answers

What is the purpose of texture coordinates in OpenGL?

To retrieve the texture color using sampling (D) Signup and view all the answers

Which lighting type represents light that has been scattered and will appear lighter or darker in various regions?

Diffuse lighting (D) Signup and view all the answers

What is the Phong model commonly used for?

Combining ambient, diffuse, and specular lighting (B) Signup and view all the answers

What does a mipmap consist of?

Texture images where each subsequent texture is twice as small compared to the previous one (B) Signup and view all the answers

What does the angle between the direction vector of the light ray and a vector perpendicular to the surface determine?

The effect of a light source at a point (A) Signup and view all the answers

What is the purpose of mipmapping in OpenGL?

To solve the issue of texture (texels) not being precisely the same size as the pixels in the rendered image (A) Signup and view all the answers

What happens if you specify texture coordinates out of the range 0 to 1 in OpenGL?

The texture will be repeated or tiled (C) Signup and view all the answers

How many texture coordinate points are typically passed to the vertex shader for interpolation in OpenGL?

3 (D) Signup and view all the answers

What does it mean if a mipmap is used in OpenGL?

The texture will be pre-filtered and reduced in size (C) Signup and view all the answers

What coordinates should be used for the top-right vertex of a triangle to correspond with the top-right side of a texture image in OpenGL?

(1,1) (C) Signup and view all the answers

What is the purpose of a mipmap in the context of texture mapping?

To store multiple versions of the same texture at different resolutions (D) Signup and view all the answers

What is the main function of texture coordinates in OpenGL?

To specify the sampling location on the texture image for each vertex (B) Signup and view all the answers

What does the Phong model, commonly used for reflective or shiny surfaces, combine in its illumination model?

Ambient, diffuse, and specular lighting (A) Signup and view all the answers

What is the role of ambient lighting in a scene?

Affects all points on all geometric surfaces by the same amount (B) Signup and view all the answers

How are texture coordinates represented in OpenGL for the lower-left and upper-right corners of a texture image?

(0,0) and (1,1) (B) Signup and view all the answers