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Since i am rotating the model's axis, I get this problem (video). the issue appears in the 23'd seconds, while i'm demonstrating how it works. As can been seen, when the z rotation causes a wrong x and y rotations.

Since i am rotating the model's axis, I get this problem (video). the issue appears in the 23'd seconds, while i'm demonstrating how it works. As can been seen, when the z rotation causes a wrong x and y rotations.

Since i aw rotating the model's axis, I get this problem (video). the issue appears in the 23'd seconds, while i'm demonstrating how it works. As can been seen, when the z rotation causes a wrong x and y rotations.

Since i am rotating the model's axis, I get this problem (video). the issue appears in the 23'd seconds, while i'm demonstrating how it works. As can been seen, when the z rotation causes a wrong x and y rotations.

Now, for the code part:

The rendering function:

- (void)render:(CADisplayLink*)displayLink {
    ...
    
    CC3GLMatrix *projection = [CC3GLMatrix matrix];
    float h = 4.0f * self.frame.size.height / self.frame.size.width;
    [projection populateFromFrustumLeft:-2 andRight:2 andBottom:-h/2 andTop:h/2 andNear:4 andFar:100];
    glUniformMatrix4fv(_projectionUniform, 1, 0, projection.glMatrix);
    
    [modelView populateFromTranslation:_currentPan];
    [modelView rotateBy:_currentRotation];
    [modelView rotateByZ:zRotationEnd];

    glUniformMatrix4fv(_modelViewUniform, 1, 0, modelView.glMatrix);
    ...        
}

- (void) rotateAroundX:(float) x andY:(float) y newRotate:(BOOL) isNewRotate
{
    if (isNewRotate) {
        rotationStart = CC3VectorMake(0.0, 0.0, 0.0);
    }
    rotationEnd.x = rotationEnd.x + (x-rotationStart.x);
    rotationEnd.y = rotationEnd.y + (y-rotationStart.y);

    rotationStart.x = x;
    rotationStart.y = y;
    _currentRotation = CC3VectorMake(rotationEnd.y, rotationEnd.x, 0);
}

And the relevant calling part:

if(sender.numberOfTouches == 1)
    {
        BOOL started = false;
        CGPoint rotation = [sender translationInView:sender.view];
        float x = rotation.x;
        float y = rotation.y;
        if (sender.state == UIGestureRecognizerStateBegan)
        {
            started = true;
        }
        [self.glView rotateAroundX:x andY:y newRotate:started];
    }

The Z rotation function:

And the relevant calling part:

- (IBAction)rotation:(UIRotationGestureRecognizer *)sender {
    BOOL started = false;
    float rotation = RadiansToDegrees([sender rotation]);
    if (sender.state == UIGestureRecognizerStateBegan)
    {
        started = true;
    }
    [self.glView rotateAroundZ:rotation newRotate:started];
    NSLog(@"Rotation %f", rotation);
}

I really can't point my finger on what i'm doing wrong over here. Would really appreciate any help.

EDIT: Second attempt

As kindly explained by the user @Fault, i understood the problems i was facing with. So i tried to solve those by just rotating the projection matrix around the z axis, which seemed to be working, but it doesn't.

Since i aw rotating the model's axis, I get this problem (video). the issue appears in the 23'd seconds, while i'm demonstrating how it works. As can been seen, when the z rotation causes a wrong x and y rotations.

I do understand that i must likely have to move these rotations to world view and not model view, the thing is i'm not really sure how to do that.

Here is the relevant code:

Render function:

{
...
 
    CC3GLMatrix *projection = [CC3GLMatrix matrix];
    float h = 4.0f * self.frame.size.height / self.frame.size.width;
    [projection populateFromFrustumLeft:-2 andRight:2 andBottom:-h/2 andTop:h/2 andNear:4 andFar:100];
    [projection rotateByZ:zRotationEnd];
    glUniformMatrix4fv(_projectionUniform, 1, 0, projection.glMatrix);
    
    [modelView populateFromTranslation:_currentPan];
    [modelView rotateBy:_currentRotation];
    

    glUniformMatrix4fv(_modelViewUniform, 1, 0, modelView.glMatrix);
...
}

- (void) rotateAroundX:(float) x andY:(float) y newRotate:(BOOL) isNewRotate
{
    if (isNewRotate) {
        rotationStart = CC3VectorMake(0.0, 0.0, 0.0);
    }
     
    int rotationDirection = ceil(zRotationEnd/90);
    if (rotationDirection % 4 == 2 || rotationDirection % 4 == 3) {
        rotationEnd.x = rotationEnd.x - (x-rotationStart.x);
        rotationEnd.y = rotationEnd.y - (y-rotationStart.y);
    } else {
        rotationEnd.x = rotationEnd.x + (x-rotationStart.x);
        rotationEnd.y = rotationEnd.y + (y-rotationStart.y);
    }
    
    

    rotationStart.x = x;
    rotationStart.y = y;
    _currentRotation = CC3VectorMake(rotationEnd.y, rotationEnd.x, 0);
    NSLog(@"Current x is: %f y is: %f z is: %f",_currentRotation.x,_currentRotation.y,zRotationEnd);

}

Z rotations:

And the vertex shader:

attribute vec4 Position;
attribute vec4 SourceColor;

varying vec4 DestinationColor;

uniform mat4 Projection;
uniform mat4 Modelview;

attribute vec2 TexCoordIn;
varying vec2 TexCoordOut;

void main(void) {
    DestinationColor = SourceColor;
    gl_Position = Projection * Modelview * Position;
    TexCoordOut = TexCoordIn;
}

I would really like to get this right, so any help will be appreciated.