Explain the three dimensional display methods ?

• Parallel projection

The production of the 2D display of the 3D scene is called projection
Project points on the object surface along the parallel lines on to the display plane
Different 2D views of objects can be produced by projecting the visible points

• Perspective projection

Done by the projecting points to the display plane along the converging points
Causes the objects farther from the viewing point should be smaller of the same sized object present here.

• Depth CUEING

Basic problem for visualization techniques is called  depth cueing
Some 3D objects are without depth information

• Visible line and surface identification

To highlight the visible lines
Display visible lines as dashed lines
Removing the invisible lines

• Surface rendering

Lightening conditions in the screen
Assigned characteristics
Degree of transparency
How rough or smooth the surfaces are to be

• Exploded and cutaway views
• Three dimensional and stereoscopic views