Rotate image

[vitrinh282]

rotate when i just add radianX image will rote up down,
radianY will rotate left right
but if I add two in same image will be wrong, you can try with your rotate demo change radianY 0 to 50,-50

[vitrinh282]

and how to rotate the image so that it always face to the camera view point?

[szt243660543]

It's also possible to rotate X and y at the same time

[szt243660543]

if you want face to the camera view,you need calculate.

[vitrinh282]

i had a position (X,Y,Z) can show you me function or formula to get rotate camera view to face.

[szt243660543]

I have to provide you with the method, that method can calculate their own rotation angle.

[vitrinh282]

(GLKVector3)CalculateSphereSurfacePointWithLat:(float)lat Lon:(float)lon Depth:(float)depth
{
GLKVector3 X_Z;
// 经
X_Z.x = depth * sin(GLKMathDegreesToRadians(lon));
X_Z.y = 0;
X_Z.z = depth * - cos(GLKMathDegreesToRadians(lon));

GLKVector3 Y_Z;
// 纬
Y_Z.x = 0;
Y_Z.y = depth * sin(GLKMathDegreesToRadians(lat));
Y_Z.z = depth * - cos(GLKMathDegreesToRadians(lat));

if (lat == 0.0) {
Y_Z = GLKVector3Make(0.0, 0.0, 0.0);
}

if (lon == 0.0) {
X_Z = GLKVector3Make(0.0, 0.0, 0.0);
}

GLKVector3 dir = [MathC vector3Normalization:GLKVector3Add(X_Z, Y_Z)];
if (lat == 0.0 && lon == 0.0) {
dir = GLKVector3Make(0.0, 0.0, -1.0);
}
GLKVector3 point = GLKVector3MultiplyScalar(dir, depth);

return point;
}

// 规格化

(GLKVector3)vector3Normalization:(GLKVector3)vec3
{
float sqr = sqrt(vec3.xvec3.x + vec3.yvec3.y + vec3.z*vec3.z);
float tempx = vec3.x/sqr;
float tempy = vec3.y/sqr;
float tempz = vec3.z/sqr;

return GLKVector3Make(tempx, tempy, tempz);
}
which method ?

[vitrinh282]

is those method ?

[szt243660543]

yes.

[szt243660543]

you use CalculateSphereSurfacePointWithLat method whitch i provide，then you need rotate it by using - (void)setRotate:(float)radiansX radiansY:(float)radiansY radiansZ:(float)radiansZ;

[vitrinh282]

when i set long is 0 and lat is 90 ,it mean on the middle top. but image still not rotate all to face , just a part

[szt243660543]

if your lon is 0 ,lat is 90 and depth is 45, then you can try : setRotate:lat radiansY:-lon radiansZ:0;
you need know: lon -> y, lat->x;

[vitrinh282]

maybe you wrong , we use CalculateSphereSurfacePointWithLat to calculate for rotate as you told above, why after calculate , you don't use them ?