Using CGPoint for RaySceneQuery

[cg76]

Hi all,

How do I convert CGPoint coordinates to device coordinates for RaySceneQuery? I'm using the code below but the ray does not return the intersection result correctly.

Code: Select all

-(void) touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
{
	UITouch *touch = [touches anyObject];
	NSUInteger numTaps = [touch tapCount];
	CGPoint pt = [touch locationInView:self];
	
	if ( numTaps > 1 )
	{	
		Ogre::Real newX = (pt.x - (320 / 2)) / (320 /2);
		Ogre::Real newY = (pt.y - (480 / 2)) / (480 /2);

                Ogre::Ray mouseRay = cameraPtr->getCameraToViewportRay(newX, newY);
	}
}

Thanks in advance,
CG

[DanielSefton]

Your calculation looks wrong. getCameraFromViewportRay takes a value of 0-1, and locationInView returns the screen coords of the touch. Try:

Code: Select all

Ogre::Real newX = 1 - (pt.x / 320);
Ogre::Real newY = 1 - (pt.y / 480);