Presentation on the topic 'Building Camera in a Program' in Computer Graphics.

1. Building camera in a
program
Aravindhan A
Final year CSE | SMIT
about.me/aravindhan

2. Why build camera?

To have finite control over camera movements,
we create and manipulate our own camera in a
program

Created through a camera class which can do
all functions

3. Camera functions
Cam.set(eye,look,up);
Cam.slide(-1,0,-2);
Cam.roll(30);
Cam.yaw(20);

5. Camera functions
setModelViewMatrix()
glMatrixMode(GL_PROJECTION)
GlLoadIdentity()
myKeyboard()

6. Model-view matrix


7. Position the camera

By default, camera is at origin, looking in –z dir

To “move the camera”, set up a modelview matrix that moves
objects that are drawn

Ignore Z-coordinate when drawing

8. LookAt function

Most 3D toolkits let you position the camera by setting
eyepoint, lookpoint, and up direction
 lookAt(Xeye, Yeye, Zeye, Xat, Yat, Zat,
Xup, Yup, Zup):

Effect: set the
modelview
matrix

9. LookAt function


10. Other viewing APIs


11. Thank you!