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Questions from the Mid Term Exam of CS602
June 25, 2015 11:00 AM
A: Its need for real world pic displaying. Its just a fancy term for a system that measures objects with width, height, n depth.
A: Perspective projection gives a more realistic view of
the objects in the scene.
A: distance = sqrt(dx*dx+dy*dy+dz*dz)
A: P' = R(θ1+θ2).p
A: Unit vector = <x,y,z>/length = |x/length, y/length, z/length|
Mine today ppr .. All mcqs fom Moaaz File Thanks God
Subjectiv b exy thy..
Q. Which type of projection is used in engineering drawings.
Q What is the difference between local and global coordinate system?
Q. If point (x.,y ) is rotated about axix anti clockwise at theta .. what will be new values?
Q. Differenciate between cabinet and car . whtvr ..
Q .Dicuss following w.r.t eqution:
- a line intersects a plane
- a line does not intersect plane
Q. Discuss 4 cases of clipping edge w.r.t .. S ka jo algorithm tha wo .
Anyways all da bxt !
Please Share The Answers of Last Two Questions .... As soon As possible
Q. Which type of projection is used in engineering drawings.
A: Parallel Projection
Q What is the difference between local and global coordinate system?
A:
Q. If point (x.,y ) is rotated about axix anti clockwise at theta .. what will be new values?
A: Positive angle of rotation will b anticlockwise.
P' = [x' y'] R=[cosθ -sinθ sinθ cosθ] P = [x y ]
Q. Differenciate between cabinet and car . whtvr ..
A: Cavalier: All lines perpendicular to the projection plan are projected no change in length.
Cabinet: Lines with are perpendicular to the projection plan are projected at 1/2 length.
-------------
Q .Dicuss following w.r.t eqution:
- a line intersects a plane
- a line does not intersect plane
-------------
Q. Discuss 4 cases of clipping edge w.r.t .. S ka jo algorithm tha wo .
A: If clipping Rectangle is denoted by dashed lines and Line is defined by using point 1 and point 2.
Case i: For each boundary b in [L(left),R(right),T(top),B(bottom)]
If P1 outside and p2 inside
Intersect point (p1')
point p2.
Case ii: For each boundary b in [L(left), R(right),T(top),B(bottom)]
If p1 and p2 inside.
point p2
Case iii: For each boundary b in [L(left), R(right),T(top),B(bottom)]
If p1 and p2 outside.
Do nothing
Case iv: For each boundary b in [L(left),R(right),T(top),B(bottom)]
If p2 outside and p1 inside.
intersection only point(p2') only.
Moaaz ki file share kr skti hian ap ? mje nae mili
Today Paper @ 12:30 PM..
18 of 20 MCQs from past papers..
Subjective ::
1). Differentiate b/w Reflection transformation and Shear transformation in 3-D system? 2
2). Explain 3-D Coordinate System? 3
3). Difference b/w Orthographic and Oblique Projections? 3
4). Differentiate b/w Cavalier and Cabinet Projection? 5
5). Give formula for
Today my paper
total question 26
20 mcq................... 14 To 15 MCQ from moiz file
6 qeustion
2 question 2 marks
2 question 3 marks
2 question 5 marks
3 qustion of matrix and other question from last chapters..........
Best of luck to all students
Q: whey do we need a three dimension picture? 2 marks
Ans: its need for real word picture displaying, its just a fancy tram for a system that measure the object with width height and depth.
Q: which projection give a most realistic view of object? 2 marks
ANS: prospective projection give a most realistic view of object in the scene.
Q: How can we find the distance between two 3D points using mathematical notation? 3 Marks
ANS: distance = sqrt(dx*dx+dy*dy+dz*dz)
Q: Two composite rotations R(θ2) and R(θ1) are performed to a point P, you are required to write the final expression of composite rotation matrix to the point P. Marks 3.
P′= R(θ1+ θ2) . P
Q: derive the formula for calculating Unit vector from a given 3D vector <x, y, z>. Marks5
ANS: A: Unit vector = <x,y,z>/length = |x/length, y/length, z/length|
Which type of projection is used in engineering drawings.
orthographic projection
Q What is the difference between local and global coordinate system?
Local coordinate systems can be defined with respect to global coordinate system
• Locations can be relative to any of these coordinate systems
• Locations can be translated or "transformed" from one coordinate system to
another.
Differentiate b/w Cavalier and Cabinet Projection? 5
Cavalier
Alpha = 45°, tan (Alpha) = 1 => L1 = 1 this is a Cavalier projection such that all lines
perpendicular to the projection plane are projected with no change in length.
Cabinet
Lines which are perpendicular to the projection plane are projected at 1 / 2 length. This is a Cabinet projection.
Q .Dicuss following w.r.t eqution:
- a line intersects a plane
- a line does not intersect plane
Discuss 4 cases of clipping edge
The clip boundary determines a visible and invisible region. The edges from vertex i to vertex i+1 can be one of four types:
1). Differentiate b/w Reflection transformation and Shear transformation in 3-D system?
Reflection
A three-dimensional reflection can be performed relative to a selected reflection axis or
with respect to a selected reflection plane.
Shears
Shearing transformations can be used to modify object shapes.
2). Explain 3-D Coordinate System? 3
3D Cartesian coordinate systems
• Direction and magnitude along three axes, with reference to an origin
• Locations are defined by x, y, z triples
• Can define cubes, cones, spheres, etc.,
• Can have multiple origins and transform coordinates among them
Difference b/w Orthographic and Oblique Projections? 3
orthographic projection
If the direction of projection is perpendicular to the projection plane then it is an
orthographic projection.
Oblique Projection
If the direction of projection is not perpendicular to the projection plane then it is an
Oblique projection
5). Give formula for
1: explain axonometric projection in the content of computer graphics ? (2 marks)
Axonometric projections are orthographic projections in which the direction of projection is not parallel to any of the three principal axes.
The dot product of 2 vectors is a scalar
4: explain orthographical projection and what meant by term oblique parallel projection? (marks 3)
Orthographic Projection
If the direction of projection is perpendicular to the projection plane then it is an
orthographic projection.
oblique parallel
Non orthographic parallel projections are called oblique parallel projection.
Define Vector Normalization?
“Normalizing” a vector means shrinking or stretching it so its magnitude is 1. A simple
way is normalize by dividing by its magnitude:
SAQIB BS.IT 6 thanks for sharing
jazak Allah
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