Hi All,

I am trying to implement split screen support for my 3d test app and I am having some weird issues.

I have managed to split the viewport into 2 seperate areas and I can get the content to be drawn on 1 of the views (not both), whenever I try to get the content drawn on both, the right hand viewport displays correctly but the left is always blank and when I update the model it's not refreshing the right hand view port (it's drawing over the existing scene).

If I only draw to the left hand view port, the updates work perfectly.

Additional info:

In order to split the screen I have created 2 new viewport objects and based on the default viewport simply split them as required.

Then in my draw method I assign the first viewport to the default view port and proceed to draw the scene.

This is followed by setting the viewport to the second viewport and proceeding to draw the scene.

Are there any tutorials out there that may be of use?

Any pointers will do...

Later,

Corpse.

Yep, thats exactly what im doing except I dont have the halfprojection matrix (is this required?)

Reading through the code it's a pity that the DrawScene method is not implemented so I could see exactly what it was doing.

The article describes have 2 implemented camera classes (which I assume will have a camerapos vector and view and proj matrixes), so what the point of the halfprojection matrix?

In my app I simply have a camerapos vector a view and projection matrix, any chance I need 2 of these to draw on the viewports?

Thanks,

Corpse.

Corpse Like:

but the left is always blank and when I update the model it's not refreshing the right hand view port (it's drawing over the existing scene).

This makes me think you amy have sized both viewports to draw over the same area, I'd double check your code, and if that isn't the problem, could you post code snippets of the relevant areas so we can get a better idea of what may be the problem?

The half projection matrix is because the aspect ratio is half what it normally would be because each view port is half of the normally 4:3 rectangle.  The code sample seems a bit odd to me though, since it creates the regular projections matrix, but never uses it.  If you wanted a horizontally split screen you'd use an 8:3 aspect ratio.  You'll need two different camera positions otherwise each screen will look exactly the same.

I have tried to use the HalfProjection matrix (which results in a totally blank screen) when drawing.

I really hope it's something obvious and nooby.....

Thanks for all the help....

Corpse.

Your leftView & rightView ViewPorts are pointing to the same default view port.  You'll need to actually create 2 new view ports and set the width/height/etc. on them.  You probably are going to want another camera definition as well, like I said earlier, other wise both ports will look the same.

ok here are 2 screenshots of the results I have achieved with the above mentioned code.

Lefthand view

Righthand view

I did some readinf on the graphicsdevice.viewport property and according to the help by assigning the leftview (and then drawing the geometry) and then assigning the rightview (and then drawing the geometry) it's supposed to update them (as per the MS example).

So I am totally confussed..... once again a desperate plea for help.....

One point of interest is that whichever view is the last to be updated is the one which is drawn correctly.

Thanks in advance,

Corpse.

I apologies, I am using the ModelAnimator class provided by dastle which handles the mesh drawing automatically.

I just found a message on the animationcomponents forum which should help me (basically I need to tell the component not to draw anything but let me do all the drawing).

On the other hand the viewport documentation in the help file (and the above mentioned Microsoft split screen sample) work beautifully (I updated the FontSample to have multiple views without a hitch).

XNA team thanks for such elegance and simplicity.... if only I would have used it correctly in the first place :D

Thanks for all who answered.

I am that 1 baby step closer......

Regards,

Corpse.