How do I use a mouse cursor with a 3d camera?

I appear to be having some issues with a mouse cursor if I have a 3D Camera enabled.

I want the cursor to always be rendered on top of everything else, so I have it set on a 2D layer. When I do this, the cursor no longer stays on the mouse's x and y pos so long as I have the 3d camera enabled.

Why is this? Why are 2d layers affected by 3d cameras?

I mocked up a quick example. Feel free to check it out.

https://1drv.ms/u/s!AlZkRk7KfdFFivsjA7O4P3LQrRDW0g?e=0iTe6y

Is this intended by design? Seems... for lack of a better word... useless for game development. When would you not want a sprite to stick to the mouse if you set it to the mouse's x and y? I'd have thought a sprite on a 2d layer would follow the mouse.

However, if you open debug and look at the mouse object, it shows a different x and y position for each layer. There's no way I can use this data from what I can tell.

I want the sprite to appear on the HUD layer, but get its positioning from the 3D layer, apparently.

Also, I know I could replace the cursor with a sprite, and that works, but for my actual game, rather than a sprite, I'm using particles.

Any ideas?

I can't open your project, but would being able to get the mouse position on different layers help?

You can do that with the mouse expression Mouse.X(layer).

Thanks, R0J0hound. That did the trick, but strangely enough I had to tell the sprite on the 2D "Cursor" layer to set its X and Y to mouse.x("Cursor") rather than the 3D layer I expected.

Makes sense if you think about it, but I'd have thought that would be default behaviour.

I think the default is mouse.x just grabs the bottom layer. I think it would be complicated for construct to automatically guess what layer to grab the position from or it may just be impossible most of the time to make a good guess.

I think the default is mouse.x just grabs the bottom layer. I think it would be complicated for construct to automatically guess what layer to grab the position from or it may just be impossible most of the time to make a good guess.

You're correct. My bottom layer is indeed 3D.

However, I'm having a similar issue trying to get the sprite on the 3D layer to follow the cursor on the 2D layer if controlled by something other than mouse, such as a gamepad or a keyboard.

Sprite.X("Layer") isn't a thing, unfortunately.

My guess is I'll need to multiply its position based on the Z difference?

There are the layertocanvas and canvasToLayer system expressions that may help there. At least when the object on the 3d layer has a zelevation of 0.