render - Top and bottom button clicked the obj model is flipped in opengl? -

@anton stucked flipping.

i downloaded project here. have 4 buttons each button set title right,left,bottom,top str variable.

in rendering initial rotation axis teapotnode_.rotationaxis = cc3vectormake(0.1, 1, 0.3);

- (void)update:(float)dt {      if ([str isequaltostring:@"right"])     {          teapotnode_.rotationaxis = cc3vectormake(0.1, 1, 0.3);         angle +=2.0;     }     else if ([str isequaltostring:@"left"])     {          teapotnode_.rotationaxis = cc3vectormake(0.1, 1, 0.3);         angle -=2.0;     }     else if ([str isequaltostring:@"bottom"])     {           teapotnode_.rotationaxis = cc3vectormake(1,0,0);         angle +=2.0;      }     else if ([str isequaltostring:@"top"])     {          teapotnode_.rotationaxis = cc3vectormake(1,0,0);         angle -=2.0;      }        else{          angle +=2.0;     }         teapotnode_.rotationangle = angle;  } 

i touch top(or)down rotation button change axis teapotnode_.rotationaxis = cc3vectormake(1,0,0); object flipped.

i want same axis position rotate object top bottom , bottom top.

the solution is:

you says rotation axis value (0.1,1,0.3) initial one. don't change value.

this project having separate function rotation. teapotnode_.rotation

use this. working fine me. try this.

globally declared:

float x=0.0; float y=0.0; float z=0.0; float angle; float rangle=2.0; float xangle; float yangle;   - (void)update:(float)dt {      if ([str isequaltostring:@"right"])     {         x=0;    y=1;  z=0;              //rotate object in y-axis(y=1 & x=0)         yangle+=rangle;                 //get angle of object rotation in y-axis (anti clockwise)         angle +=rangle;                 //increment angle of object rotation in anticloclwise     }     else if ([str isequaltostring:@"left"])     {         x=0;    y=1;  z=0;              //rotate object in y-axis(y=1 & x=0)         yangle-=rangle;                 //get angle of object rotation in y-axis (cloclwise)         angle -= rangle;                //inc angle of object rotation in clockwise      }     else if ([str isequaltostring:@"bottom"])     {         x=1;    y=0;  z=0;              //rotate object in x-axis(x=1 & y=0)         xangle+=rangle;                 //get angle of object rotation in x-axis (anti clockwise)         angle += rangle;                //inc angle of object rotation      }     else if ([str isequaltostring:@"top"])     {         x=1;    y=0;  z=0 ;              //rotate object in y-axis(x=1 & y=0)         xangle-=rangle;                 //get angle of object rotation in x-axis (cloclwise)         angle -= rangle;                //inc angle of object rotation       }      else     {         angle +=rangle;     } //    teapotnode_.rotationaxis = cc3vectormake(x, y, z); //    teapotnode_.rotationangle = angle;     teapotnode_.rotation = cc3vectormake(xangle, yangle, 0);  }