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 Axonometric 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
VPN(n)
VRP
VUP(v) zw xw yw u
UVN coordinate system

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 );
View point
near
far
left
right
top
bottom

11. OpenGL
void glOrtho( GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble zNear, GLdouble zFar );
left
top
Toward the
view point
bottom
near
far
right

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 );