# Recent questions in Computer Graphics

1
Below are the few steps given for scan-converting a circle using Bresenham’s Algorithm. Which of the given steps is not correct? Compute $d= 3-2r$ (where $r$ is radius) Stop if $x>y$ If $d< 0$, then $d=4x+6$ and $x=x+1$ If $d\geq 0$, then $d=4 \ast(x-y)+10, \: x=x+1$ and $y=y+1$
2
Which of the following is/are side effects of scan conversion? Aliasing Unequal intensity of diagonal lines Overstriking in photographic applications Local or Global aliasing a and b a,b and c a,c and d a,b,c and d
3
Consider a line $AB$ with $A=(0,0)$ and $B=(8,4)$. Apply a simple $DDA$ algorithm and compute the first four plots on this line. $[(0,0),(1,1),(2,1),(3,2)]$ $[(0,0),(1,1.5),(2,2),(3,3)]$ $[(0,0),(1,1),(2,2.5),(3,3)]$ $[(0,0),(1,2),(2,2),(3,2)]$
1 vote
4
Consider a raster system with resolution $640$ by $480$. What size is frame buffer (in bytes) for this system to store $12$ bits per pixel? $450$ kilobytes $500$ kilobytes $350$ kilobytes $400$ kilobytes
1 vote
5
Consider the following statements regarding $2D$ transforms in computer graphics: $S1: \: \begin{bmatrix} 1 & 0 \\ 0 & -1 \end{bmatrix}$ is a $2 \times 2$ matrix that reflects (mirrors) only $2D$ point about the X-axis. $S2:$ A $2 \times 2$ matrix which mirrors any $2D$ point ... statements $S1$ and $S2$? Both $S1$ and $S2$ are true Only $S1$ is true Only $S2$ is true Both $S1$ and $S2$ are false
6
In the context of 3D computer graphics, which of the following statements is/are true? P : Orthographic transformations keep parallel lines parallel. Q : Orthographic transformations are affine transformations. Select the correct answer from the options given below: Both P and Q Neither P nor Q Only P Only Q
1 vote
7
Using the phong reflectance model, the strength of the specular highlight is determined by the angle between the view vector and the normal vector the light vector and the normal vector the light vector and the reflected vector the reflected vector and the view vector
1 vote
8
Find the transformation matrix that converts a square with diagonal vertices (0,3) and (-3,6) into a unit square at the origin??
1 vote
9
A graphic display system has a frame buffer that is 640 pixels high , 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately: 16 frames per second 19 frames per second 21 frames per second 23 frames per second
10
Which of the following statements is/are True regarding the solution of the visibility problem in 3D graphics? S1: The painter's algorithm sorts polygons by depth and then paints (scan - converts) each Polygon on to the screen starting with the most nearest polygon S2: Backface Culling refers to eliminating geometry with backfacing normals S1 only S2 only Both S1 and S2 Neither S1 nor S2
11
Consider the matrix $M=\begin{bmatrix} 2 & 0 & 2 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{bmatrix}$ representing a set of planar (2D) geometric transformations in homogeneous coordinates. Which of the following statements about the matrix M is True? M represents first, a ... 1) followed by shearing of parameters (-1,1) M represents first, a shearing of parameters (-1, 1) followed by scaling of vector (3,1)
12
Which of the following statements is/are True regarding the solution to the visibility problem in $3D$ graphics ? $S1 :$ The Painter's algorithm sorts polygons by depth and then paints (scan - converts) each Polygon on to the screen starting with the most nearest ... $S2 :$ Backface Culling refers to eliminating geometry with backfacing normals. S1 only S2 only Both S1 and S2 Neither S1 nor S2
1 vote
13
Perform window to viewport transformation for the point (20,15). Assume that $(X_{wmin}\ ,Y_{wmin} )$ is $(0,0)$ ; $(X_{wmax}\ ,Y_{wmax} )$ is $(100,100)$ ; $(X_{vmin}\ ,Y_{vmin} )$ is $(5,5)$ ; $(X_{vmax}\ ,Y_{vmax} )$ is $(20,20)$ . The value of $x$ and $y$ in the viewport is $x=4,y=4$ $x=3,y=3$ $x=8,y=7.25$ $x=3,y=4$
14
I have a confusion that how the Gpu internal memory different from primary memory in the sense when which of the memory is active. For example suppose i am doing GPU programming or playing a video game then primary memory plays a role or only GPU memory. Suppose I increased my RAM without touching GPU will there be any improvement in my Gpu programming or my video games.
1 vote
15
Which of the following is not true in case of Oblique Projections? Parallel projection rays are not perpendicular to the viewing plane Parallel lines in space appear parallel on the final projected image Used exclusively for pictorial purposes rather than formal working drawings Projectors are always perpendicular to the plane of projection
1 vote
16
With respect to CRT, the horizontal retrace is defined as The path an electron beam takes when returning to the left side of the CRT The path an electron beam takes when returning to the right side of the CRT The technique of turning, the electron beam off while retracing The technique of turning, the electron beam on/ off while retracing
1 vote