Unable to destroy gameobject on mouseclick

[viral timber]

I'm trying to destroy the red circle when a mouse is clicked using raycast2d and comparing the gameobject tag

The red circle (tagged as "Trash") should be destroyed

Currently, i have made the mouse to cast a ray, detect a click on the screen and check whether the object clicked has the "Trash" tag

I have also set the camera as the "MainCamera" tag, and the red circle has a 2d box collider with the "Trash" tag

from the various unity forums I've read

Here's my code

https://pastebin.com/MXPppL9f

semi-related but I read that Raycast2D can never be null? Hence I need Raycast2D != null? to check if it's working?

[normal junco]

There are so many issues in that code it feels like you've no idea what you're doing at all. I'd recommend going over the unity beginner pathways before you start working on your own project.

!learn

[velvet laurel]

:teacher: Unity Learn ↗

Over 750 hours of free live and on-demand learning content for all levels of experience!

[normal junco]

The main issue is that in 2d you don't cast rays to detect objects at mouse position. You use overlap point or similar queries, because you literally want to see if the mouse position is overlapping any objects in 2d space.

[viral timber]

Oh I've made a couple of project before and published on itch but it's mostly brute forcing my way through

But thanks for the reminder will take a look at the learn unity page

Again

[gusty basalt]

Physics2D.GetRayIntersection is the appropriate function for this, not Raycast

[viral timber]

Ooo I'll try thanks

[viral timber]

I'm late to respond but thank you so much man

it's been long fixed

I just wanna take note of this in case i need to use this in the future

from what I've read Physics2D.GetRayIntersection casts a 3d ray that interacts with 2D colliders

but Raycast itself just interacts with any type of collider, whether it be 3d or 2d

[gusty basalt]

nope

[viral timber]

whoops my mistake

[gusty basalt]

Physics.Raycast interacts with 3D colliders
Physics2D.Raycast interacts with 2D colliders

[viral timber]

ahhh

[gusty basalt]

and this is correct

[viral timber]

why is Physics2D.Raycast not appropriate in this case?

[gusty basalt]

because you're firing a 3D ray from the camera at 2d objects

You are talkiung about a 2D raycast with ZERO length which is really not a raycast at all at that point

The raycast should be imagined as like aiming a laser pointer in the scene and seeing what it touches

[viral timber]

oh

Ray mouseRay = Camera.main.ScreenPointToRay(mousePosition);
this is firing a 3d ray in this scene from the mouse?

[gusty basalt]

from the camera

towards the point the mouse is aiming at

[viral timber]

i've used this before when i made a 2d survival game where enemies flood the player from left and right

2d raycast

degenerate?

[gusty basalt]

i mean when you do a raycast with zero lenght

that's degenerate

[viral timber]

ohhh

[gusty basalt]

imagine this image but the line has no length

so it's just a point

[viral timber]

ahhh

if you don't mind me leaving for a bit to find the time I use a physics2d.raycast, just so I could make sure I still remember what physics2d.raycast did

a short gif of putting it into practice

I'm not sure whether this is a right use of the physics2d.raycast, but i made a raycast at a fixed length that affects the enemy ai.

If the raycast returns the gameobject tag player, it pursues the player until it's close enough to attack

if the player leaves the raycast fixed range, the enemy goes back to its wandering behaviour