旋转OpenGL-ES对象

经过数小时的奋斗，我终于可以画出一个物体，但在旋转时卡住了。我试图围绕Y轴旋转，但我似乎无法以任何方式使旋转平滑。它几乎是跳来跳去。可能有一些不尽相同的东西，因此我使用了一个模板。旋转OpenGL-ES对象

- (void)update 
{ 
    float aspect = fabsf(self.view.bounds.size.width/self.view.bounds.size.height); 
    GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(65.0f), aspect, 0.1f, 100.0f); 

    self.effect.transform.projectionMatrix = projectionMatrix; 

    GLKMatrix4 baseModelViewMatrix = GLKMatrix4MakeTranslation(0.0f, 0.0f, -4.0f); 

    // Compute the model view matrix for the object rendered with ES2 
    GLKMatrix4 modelViewMatrix = GLKMatrix4MakeTranslation(0.0f, 0.0f, 0.0f); 
    modelViewMatrix = GLKMatrix4Rotate(modelViewMatrix, startPoint.y, 0.0f, 1.0f, 0.0f); 

    dx = dy = 0; 
    modelViewMatrix = GLKMatrix4Multiply(baseModelViewMatrix, modelViewMatrix); 

    _normalMatrix = GLKMatrix3InvertAndTranspose(GLKMatrix4GetMatrix3(modelViewMatrix), NULL); 

    _modelViewProjectionMatrix = GLKMatrix4Multiply(projectionMatrix, modelViewMatrix); 

    _rotation += self.timeSinceLastUpdate * 0.5f; 
}

我的触摸行为：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    startPoint = [touch locationInView:self.view]; 
} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    CGPoint point = [touch locationInView:self.view]; 
    dx = point.y - startPoint.y; 
    dy = point.x - startPoint.x; 
    startPoint = point; 
} 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 

}

在此先感谢。

来源

2012-01-23 JavaCake

-1

通过以下链接的苹果库它可以解决您的问题 [http://developer.apple.com/library/ios/#samplecode/GLSprite/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007325

来源

2012-01-23 07:15:49

感谢您的回复，但不幸的是，样本没有任何用户交互的手段。 – JavaCake

-1另一个评论，只是一个链接 – michaelsnowden

旋转OpenGL-ES对象

回答

相关问题