week 05 Jim_c OpenGL

Class work -01
open (jsyeh/3dcg10)>download>data,window32,glut32> 
>extract window 32 file 
>extract data file into window 32
>place glut 32 into window 32

open transformation app>to do swap change
>on command window right click open the small window to do swap change
1-02 figure rotate

case a translate/rotate
>the translate
>rotate
>
case b rotate/translate
>the object will bigger on right side
>camera moved


classwork 02
\\

>>rotate in OpenGL
glPushMatrix();
            glRotatef(rotX,0,1,0);//設x為水平線

int main(int argc,char**argv)
{
        glutInit(&argc,argv);
        glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
        glutCreateWindow("hello 3d");
        glutDisplayFunc(display);
        glutMotionFunc(motion);//開啟旋轉


Question 1:
BUFFER-
>>ome block of memory. People tend to use the word "buffer" when talking about moving data around, 

>>because the data will be placed in the buffer, then placed in its final destination.
Question 2:>>glPushMatrix();  //push =back up //backup matrix (translate,rotate,scale)

>>glPopMatrix();//pop =recover to default

>>As the name implies, a double has 2x the precision of flaot

classwork 03
x,y rotate

>>float rotX=0,rotY=0; //宣告一個浮點單位

>>glRotatef(rotX,0,1,0);//設x為水平線

>>glRotatef(rotY,1,0,0);//Y的移動量，讓它對Y軸轉

>>void motion(int x,int y)
{
    rotX=x;
    rotY=y;
    display();
}
>>glutInitWindowSize(300,450);//窗口大小

>>glutInitWindowPosition(300,400);//窗口位置