Type of View

1
Type of View

• Perspective View
• COP(Center of Plane)
• Diminution of size
• Natural appearance

2
Type of View

• Vanishing Point

3
Type of View

• Parallel View
• DOP (Direction of Projection)

4
Type of View

• Orthographic Projections
• Preserve Angle, Distance
• Axonometric Projections
• Oblique Projections preserve angle

5
Projection

• Near Plane(front plane)
• Far Plane(back plane)
• View Window
• Parallelpiped volume
• View Frustum
• Projection reference point

6
Positioning of Camera

• Using the Model View Matrices
• Movement of the world frames
• Initial camera position
• After change Model view matrix

7
Projection Pipeline
8
Positioning of Camera

• VRP(view reference point)
• VUP(view up vector)
• VPN(view plane normal)
• Look At Point

9
OpenGL

• void gluPerspective( GLdouble fovy, GLdouble
  aspect, GLdouble zNear, GLdouble zFar )

aspect w/h
w
h
?
View point
fovy
near
far
10
OpenGl

• void glFrustum( GLdouble left, GLdouble right,
  GLdouble bottom, GLdouble top, GLdouble znear,
  GLdouble zfar )

11
OpenGL

• void glOrtho( GLdouble left, GLdouble right,
  GLdouble bottom, GLdouble top, GLdouble zNear,
  GLdouble zFar )

left
top
Toward the view point
bottom
near
right
far
12
OpenGL

• void gluLookAt( GLdouble eyex, GLdouble eyey,
  GLdouble eyez, GLdouble centerx, GLdouble
  centery, GLdouble centerz, GLdouble upx, GLdouble
  upy, GLdouble upz )
• void glViewport( GLint x, GLint y, GLsizei width,
  GLsizei height )