Hello,

I am using clould reco example and added following method to CRParentViewControllerClass. 

bool
linePlaneIntersection(QCAR::Vec3F lineStart, QCAR::Vec3F lineEnd,
                      QCAR::Vec3F pointOnPlane, QCAR::Vec3F planeNormal,
                      QCAR::Vec3F &intersection)
{
    QCAR::Vec3F lineDir = SampleMath::Vec3FSub(lineEnd, lineStart);
    lineDir = SampleMath::Vec3FNormalize(lineDir);
    
    QCAR::Vec3F planeDir = SampleMath::Vec3FSub(pointOnPlane, lineStart);
    
    float n = SampleMath::Vec3FDot(planeNormal, planeDir);
    float d = SampleMath::Vec3FDot(planeNormal, lineDir);
    
    if (fabs(d) < 0.00001) {
        // Line is parallel to plane
        return false;
    }
    
    float dist = n / d;
    
    QCAR::Vec3F offset = SampleMath::Vec3FScale(lineDir, dist);
    intersection = SampleMath::Vec3FAdd(lineStart, offset);
    
    return true;
}
void
projectScreenPointToPlane(QCAR::Vec2F point, QCAR::Vec3F planeCenter, QCAR::Vec3F planeNormal,
                          QCAR::Vec3F &intersection, QCAR::Vec3F &lineStart, QCAR::Vec3F &lineEnd)
{
    CloudRecoAppDelegate* delegate = (CloudRecoAppDelegate*)[[UIApplication sharedApplication] delegate];
    QCARutils *qUtils = [QCARutils getInstance];
    
    // Window Coordinates to Normalized Device Coordinates
    QCAR::VideoBackgroundConfig config = QCAR::Renderer::getInstance().getVideoBackgroundConfig();
    
    float halfScreenWidth = qUtils.viewSize.height / 2.0f; // note use of height for width
    float halfScreenHeight = qUtils.viewSize.width / 2.0f; // likewise
    
    float halfViewportWidth = config.mSize.data[0] / 2.0f;
    float halfViewportHeight = config.mSize.data[1] / 2.0f;
    
    float x = (qUtils.contentScalingFactor * point.data[0] - halfScreenWidth) / halfViewportWidth;
    float y = (qUtils.contentScalingFactor * point.data[1] - halfScreenHeight) / halfViewportHeight * -1;
    
    QCAR::Vec4F ndcNear(x, y, -1, 1);
    QCAR::Vec4F ndcFar(x, y, 1, 1);
    
    // Normalized Device Coordinates to Eye Coordinates
    QCAR::Matrix44F projectionMatrix = [QCARutils getInstance].projectionMatrix;
    QCAR::Matrix44F inverseProjMatrix = SampleMath::Matrix44FInverse(projectionMatrix);
    
    QCAR::Vec4F pointOnNearPlane = SampleMath::Vec4FTransform(ndcNear, inverseProjMatrix);
    QCAR::Vec4F pointOnFarPlane = SampleMath::Vec4FTransform(ndcFar, inverseProjMatrix);
    pointOnNearPlane = SampleMath::Vec4FDiv(pointOnNearPlane, pointOnNearPlane.data[3]);
    pointOnFarPlane = SampleMath::Vec4FDiv(pointOnFarPlane, pointOnFarPlane.data[3]);
    if ([delegate.modelViewMatrix count] > 0){
        for ( int vv = 0 ; vv < 16 ; vv++){
            //NSLog(@"use::vv%d::%@",vv,delegate.modelViewMatrix[vv]);
            modelUse.data[vv] = [[delegate.modelViewMatrix objectAtIndex:vv] floatValue];
        }
        
    }
    
    
    // Eye Coordinates to Object Coordinates
    QCAR::Matrix44F inverseModelViewMatrix = SampleMath::Matrix44FInverse(modelUse);
    
    QCAR::Vec4F nearWorld = SampleMath::Vec4FTransform(pointOnNearPlane, inverseModelViewMatrix);
    QCAR::Vec4F farWorld = SampleMath::Vec4FTransform(pointOnFarPlane, inverseModelViewMatrix);
    
    lineStart = QCAR::Vec3F(nearWorld.data[0], nearWorld.data[1], nearWorld.data[2]);
    lineEnd = QCAR::Vec3F(farWorld.data[0], farWorld.data[1], farWorld.data[2]);
    linePlaneIntersection(lineStart, lineEnd, planeCenter, planeNormal, intersection);
}

This method is called as

  QCAR::Vec3F intersection, lineStart, lineEnd;
    projectScreenPointToPlane(QCAR::Vec2F(location.x, location.y), QCAR::Vec3F(0, 0, 0), QCAR::Vec3F(0, 0, 1), intersection, lineStart, lineEnd);
    NSLog(@"intersection Point: %f:%f:%f",intersection.data[0],intersection.data[1],intersection.data[2]);

However the touch point that I am getting is looking off. When I start touching the screen in potrait mode - touching the screen from top to down decreases the data[1] of the intersection point and touch from left to right increases the data[0] of the intersection point. I was expecting it to be reverse. 

Can you please advice why this would be.