Vista - Camera transform affects hit test results

I used to move the camera by modifying the Location and Up vector. Nov CTP
introduced camera transform so I have rewritten the application to use this
property. The problem is that if the camera transform is not the identity,
the hit test results are "distorted" (I am clicking on an object and a
different one is selected). I am not sure but I suspect that camera transform
is not taken into account when converting the 2D hit point into a 3D ray.

We found a few bugs related to the Transform property and hit testing. What
type of Camera is it? Perspective? Matrix?

Thanks,
Jordan

"viliescu" <viliescu@discussions.microsoft.com> wrote in message
news:BFBCA4E2-7A4E-4309-8788-25CBDE0119FB@microsoft.com...
>
> I used to move the camera by modifying the Location and Up vector. Nov CTP
> introduced camera transform so I have rewritten the application to use
> this
> property. The problem is that if the camera transform is not the identity,
> the hit test results are "distorted" (I am clicking on an object and a
> different one is selected). I am not sure but I suspect that camera
> transform
> is not taken into account when converting the 2D hit point into a 3D ray.

It's a PerspectiveCamera.

I have reposted the issue in another thread (see "Dec CTP" on 12/19) and
somebody said this is a known bug. So I am using a workaround - I am applying
the transform directly to the camera's properties (Position, UpDirection,
LookDirection)

Thank you,
Valentin

"Jordan Parker [MSFT]" wrote:

> We found a few bugs related to the Transform property and hit testing. What
> type of Camera is it? Perspective? Matrix?
>
> Thanks,
> Jordan
>
> "viliescu" <viliescu@discussions.microsoft.com> wrote in message
> news:BFBCA4E2-7A4E-4309-8788-25CBDE0119FB@microsoft.com...
> >
> > I used to move the camera by modifying the Location and Up vector. Nov CTP
> > introduced camera transform so I have rewritten the application to use
> > this
> > property. The problem is that if the camera transform is not the identity,
> > the hit test results are "distorted" (I am clicking on an object and a
> > different one is selected). I am not sure but I suspect that camera
> > transform
> > is not taken into account when converting the 2D hit point into a 3D ray.
>
>
>

From reflecting on the Dec CTP bits, it appears the
PerspectiveCamera.Transform hit testing bug didn't make it in time. The next
release should contain it so let us know if you still have a problem with
the next one.

Jordan

> It's a PerspectiveCamera.
>
> I have reposted the issue in another thread (see "Dec CTP" on 12/19) and
> somebody said this is a known bug. So I am using a workaround - I am
> applying
> the transform directly to the camera's properties (Position, UpDirection,
> LookDirection)
>
> Thank you,
> Valentin