In 3D graphics, which statements are true? P: Back-face culling is an example of image-precision visible-surface determination. Q: In single-sample rasterization, a Z-buffer stores a depth value for each pixel and uses depth comparisons to determine visible surfaces; its numerical precision depends on the implementation.
Q only
P is false: back-face culling classifies entire faces by their orientation, so it is an object-precision operation rather than a per-pixel visibility test. Q is true: the Z-buffer compares fragment depths at each pixel to retain the visible surface. Depth formats vary, including common 16-, 24- and 32-bit formats. Therefore Q only is true.
Important Questions from Three Dimensional Concepts
- A normalized matrix that maps a 3D window specified by coordinates (1, 1, 1) and (4, 5, 6) on to a viewport specified by coordinates (2, 4, 2) and (8, 10, 8) is
Which of the following statements are true.
A. Painters' algorithm is also called depth sort algorithm.
B. Gourad shading is on interpolating shading method.
C. Gourad shading is an averaging shading method.
D. The Z-buffer algorithm finds the largest depth value Z.
Choose the correct answer from the options given below:
- _________ and _________ views cannot be framed together for rendering a computer visual appropriately.
In the context of 3D Computer graphics, which of the following statements is/are correct?
(A) Under perspective projection, each set of parallel lines in the object do not stay parallel in the image (except those that are parallel to the viewplane to start with).
(B) Applying a perspective transformation in the graphics pipeline to a vertex involves dividing by its 'z' coordinate.
(C) Perspective transformation is a linear transformation.
Choose the correct answer from the options given below:
Concerning phong shading and Gouraud shading in a 3D scene, which of the following statements are true ?
(A) Gouraud shading requires more computation than phong shading.
(B) Gouraud shading linearly interpolates the color of an interior pixel from the color at the vertices
(C) Phong shading interpolates over the normal vectors specified at the vertices.
Choose the correct answer from the options given below:
