koobas.hobune.stream
OnMouseDown raycast doesnt match UI crosshair
I am creating a first person game with a crosshair for aiming. If the user clicks an object, that object turns red. I have placed a small script on a cube in my scene which uses void OnMouseDown() to change the colour.
I am also using the new unity UI to place a crosshair on screen. the Crosshair is a 10x10 pixel image, centered in the middle of the screen. (Pivot X: 0.5, Y:0.5, Pos X: 0, Y: 0). The canvas itself is set to "Screen Space Overlay". This roughly works ok, but there seems to be a slight offset issue:
As you can see from the above image, I am able to select the cube, even when my crosshair is actually slightly underneath it. Why is there this mismatch between the raycast and the ui crosshair, and how do I resolve it?
If you are using OnMouseDown() on the cube to change the color, it will run any time that the cube is clicked, crosshair or not. You'll need to run a few "if" statements inside the OnMouseDown() to make sure that the crosshair is colliding before changing the color. Something like:
void OnMouseDown()
{
if (crossHairIsColliding == true)
{
// Change color here
}
}
@placusbrutus I feel this slightly misunderstands my problem. The problem is that the crosshair is not really meant to "exist" in the world per-se. It is merely a reference point so that the player knows what they are looking at. The idea is that the crosshair in the middle of the screen and the implicit raycast of "On$$anonymous$$ouseDown" should match up, but that does not seem to be the case.
