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Anonymous
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What is the main reason for computing the View Volume in the View Transformation Process? list one other problem with view projection
- During view projection, depth information is lost, which is needed for clipping / hidden surface removal.
- another problem: object behind camera are projected to the front of camera
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box vs frustum?
frustum is the 3d view volume for a perspective projection, while box is for parallel.
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What is the problem with View Frustum and what is the solution?
It is hard and costly to check whether object lie within a frustum. Convert the frustum to canonical view volume using perspective transformation for easier calculation of hidden surfaces
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matrix for transforming a view frustum into a canonical view volume
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Example calculation
 - (divide by w to get 3D cartesian cooridnates)
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what does clipping mean? name two approaches
need to remove/clip objcets outside canonical view volume.
- Cohen-Sutherland algorithm: clipping liens
- Sutherland-Hodgman algorithm: clipping polygons
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Explain Sutherland-Cohen algorithm.
- 9 sections, outocdes: tbrl-0000/1111 (to be really lost)
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what is trivial accept? and how to check?
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What is trivial reject? and how to check?
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Name for polygon clipping algorithm?
Sutherland-Hodgman algorithm
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Sutherland Hodgman - 4 types of edges
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describe sutherland-hodgman algorithm
- traversing the polygon edges using the following method:
 
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