Questions tagged [raycasting]

A technique for using rays to determine points of intersection. Often used in lighting simulation.

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Why is unity's RaycastHit2D contact point is slightly off

This is a small test I made, basically I have a simple BoxCollider2D that has the top surface aligned with the x axis. It's just a ...
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42 views

How can I implement ground clamping across slopes in my 2D collision controller?

I'm working on improving my 2D collision controller, but am having trouble with "ground clamping" when my object moves past certain slopes on which it should be descending. The controller takes the ...
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116 views

Why don't raytracing algorithms include the speed of light?

From what I understand about ray-tracing, it is instantaneous in its speed from the light source to the user. Is there a type of ray-tracing where the "rays" move at the speed of light or are affected ...
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unity: input event consumed by image raycast target that is “under” a sprite with a 2D collider

I am having a hard time getting my UI to work. Basically I have a canvas with a UI image A that is the size of the screen. This image has raycast enabled and if effectively receiving inputs. Not in ...
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1answer
31 views

RayCast node always return null

I'm using RayCast node to check the object is grounded. Here's the setting: RayCast node is placed near by ground and the length enough to collide with ground. Also RayCast node is enabled. RayCast ...
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20 views

Unity 3d Raycast from localspace to worldspace

I want a raycast direction not relative to the rotation, but what happens is that the raycast points to one place as if it was a transform.forward Why is the happening help ...
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1answer
92 views

3D line segment AABB collision, with hit normal?

I'm embarrassed I can't find this, but I'm wanting to detect intersection with a 3D line segment (not an infinite ray) with a 3D AABB, the AABB being defined as two Vec3f's which represent the Min and ...
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40 views

RayCasting with Mode7

I'm trying to join the mode7 algorithm with RayCasting. For mode7, I'm using a simple rotation matrix to implement the rotation. The result is a little strange and I can't fix it. Do you know what is ...
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1answer
34 views

How to raycast from a UI element

How do I raycast from a UI object? I have tried Ray ray; Camera cam; Transform obj; //UI object ray = cam.ViewportPointToRay(obj.position); AND ...
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RayCasting picture noise render method

I'm creating a RayCasting tutorial on github (click here to access it) and I'm following a lot of tutorials, implementations and other render methods in the web. One game made with it is the "Prelude ...
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1answer
129 views

Unity Raycast not detecting layers

I am having problems with layers detection using raycasts. Context: I created a grid to use in a pathfinding algorithm on a 2D plane. I want to implement now different weights according to the layer ...
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3answers
134 views

How can I offset a direction when raycasting?

I'm trying to figure out how I can best offset a direction when raycasting. So let's say I have an object and I want to cast a ray from my mouse position to said object, that's easily done with (for ...
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1answer
165 views

What is a raycast?

I use this script to build buildings on my terrain, and it works with the collider somehow. But I don't understand what it is that the raycast does to find the right place to put my building. ...
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How to properly interact with game objects in Unity3D? [closed]

I am trying to make a game where player will be placed in the scene and the goal is to explore it. He can interact with game objects that player can find in the environment, like picking object, ...
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1answer
28 views

Can a Unity button detect a tap AND send that tap through to objects below it?

I'm trying to make a "highlight frame," like a flashing box around a button for use in the game's tutorial. When the frame is tapped, I'd like it to register the tap (so the frame can be dismissed) ...
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1answer
36 views

Unity3d: Find a point on the line which has shortest distance from the third point

So, initially, I had points A and C. To get point B, I had to shoot a raycast down from ...
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103 views

Three js raycaster WITHOUT camera

I seem to find only examples to use the raycaster with the camera, but none that just have a raycaster from Point A to Point B. I have a working raycaster, it retrieves my Helpers, Lines etc. but it ...
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1answer
282 views

Unity3d: Get a direction vector parallel to plane

I need to send a raycast from my camera which is parallel to the plane (Ground) and in the same direction of its forward vector (Represented by the black color vector) I cant use world space ...
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43 views

Screen to world raycast imprecision

I am trying to convert screen point (mouse position) to ray in world space. It works, but it lacks precision. Here is the code: ...
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28 views

Whats the most efficient way to implement precise ray picking for scenes with large meshes?

I'm wondering how to implement ray picking in the most efficient way for scenes with very large meshes ( > 1 million faces)? Right now I'm using BulletSharp physics wrapper with TriangleMesh which ...
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263 views

Unity Raycasting only hitting mesh colliders from particular directions

I have a game which involves clicking to select some objects. Each of the objects has a mesh collider attached to it so that objects can be clicked, handled by the following: ...
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1answer
191 views

C++ Mouse picking for ray to plane intersection

I'm making a C++/OpenGL application (decidedly without GLM), and I'd like to understand how to create a ray from the camera eye to the mouse pointer, as well as detect an intersection point from the ...
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2answers
208 views

Efficient collision detection of sphere with wall

I'm building a first-person game where up till now the player has been represented as a dimensionless point; this makes collision detection really easy, as I can just cast a ray along their velocity ...
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151 views

Raycast collision Detection different results?

So I'm trying to make a collision detection system for a kinematic rigidbody for a gameobject but for some reason the results in which the gameobject stop is always different. I tried missing around ...
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38 views

Problem with repeating objects in array when already in the array

When the player move forward then paint is instantiate and stored in the array, even if the paint is already in the array it will again be stored in the array. But I don't want to repeat any paint in ...
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1answer
84 views

How to detect when the player has filled a shape?

In my game, the player is presented with a plane containing obstacles (orange / blue) and regions of empty space (white). The player moves their green cube around the empty space, which instantiates ...
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44 views

MousePicking in LWJGL - How to do it?

I have been working on a mouse picker for a scene in 3d for a client, and been having issues implementing a proper mouse pick. His application does not use a camera, and I am trying to get the ray ...
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2answers
68 views

How to check if a specific instance of a prefab is pressed?

This one is hard to explain, so I'll show the code first - ...
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1answer
247 views

Raycasting from an object to the center of the screen (crosshair) without clipping through objects

Am trying to learn about Raycasting, and I thought I would start with something simple, and that was a laser that would come out of an object (think laser pointer in your hand) and always go to the ...
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2answers
64 views

Perform intersection (horizontal and vertical) checking in raycasting

I want to check the horizontal and vertical intersections on my raycasting view, and I can't exactly understand what is ALPHA using this drawing source : https://www.permadi.com/tutorial/raycast/...
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1answer
169 views

Raycasting center of camera is not working: why?

In my game i'm using Unity First Person controller. I check every second what I am looking with the following code: ...
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1answer
177 views

Understanding the rendering of the raycasting on flat screen

I have a misunderstanding of the raycasting formulas on flat screen because my rendering is not what I expected, this is some parts of the code to show my projection formulas that I wrote by myself ...
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1answer
75 views

Unity3D Raycasting in Start behaves uncorrectly, but works correctly in Update?

I have this method, which just raycasts at a position downwards, and checks what tile is there, if there is one: ...
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1answer
82 views

Finding the on-screen height of straight walls in raycasting rendering

I have an issue to find the correct height of walls to make them straight in raycasting rendering. This is how I calculate the height of the wall which is h_seen: ...
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1answer
76 views

Rendering a raycasting view

I am trying to reproduce the raycasting of the game Wolf3D. I read this tutorial, but I am struggling to understand how to code the intersection between the rays and the walls by using angles and ...
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1answer
82 views

What are some gameplay cases where knowing the Z as a result of the raycasting is useful in a 2D setting?

The context is an 3D engine with a 2.5D level format. Like a roller coaster tycoon level, with some other level features added, and layers removed. For example the tile functions have the following ...
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1answer
205 views

Unity AudioSource.PlayClipAtPoint - controlling attenuation

New developer here, looking to do some raycasting and controlling audio positioning in 3D space based on the raycasts interactions with other objects. I've got the raycast 'casting' and able to report ...
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1answer
208 views

Rigidbody & Ray alternative or optimization

I am creating an AI that moves around to certain points, but should interact with ais or objects seen. The ai should find other ai to comunicate or look for objects on the ground. It works with all ...
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3answers
125 views

In 2D, how can I improve character rotation using raycasts when dealing with sharp/convex edges?

Edit: After making some edits to my polygon collider (based on @Alex F's suggestion), I can indeed confirm that sharp, convex corners are causing the buggy ...
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1answer
154 views

Unity SphereCast HitInfo Give me an interpolation of the normal surface?

I'm doing a SphereCast for a GroundCheck of a player. I have my Raycast hitInfo, and here in the picture at the left, I Debug.drawRay in black the direction of the hitInfo.normal every frame It seems ...
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45 views

How to implement Microwave Signals in Unity?

I need to implement microwave signals for object detection in Unity. I know there are raycast sensors in Unity, but can microwave signals be simulated or can a proxy of microwave signals be created ...
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1answer
151 views

Why does my collider rotate correctly on a slope only when a ray is cast directly from its center?

Edit: This answer might also be helpful to those who come across this question. I've been messing around with raycast collisions and slopes, but am having an issue when trying to get my collider to ...
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25 views

Check gap in 3d environnement

I am in a 3d environnement, when I jump, i'm calculating the hitPoint of the end jump. I want to know when I jump, if there is a GAP between my initial point, and the end point. But I don't want to ...
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1answer
290 views

How to detect when the mouse is over a particular enemy collider, without falsely selecting bullet colliders?

I have an enemy shooting around. My game mechanic involves hovering over the enemy with the mouse to drain its health. While the enemy is moving, you need to follow it with your mouse. If you don't ...
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1answer
90 views

Raycaster calculation question

I am following this tutorial https://lodev.org/cgtutor/raycasting.html When deriving deltaDistX geometrically you get, with Pythagoras, the formula "sqrt(1 + (rayDirY * rayDirY) / (rayDirX * ...
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183 views

Difference between reflection mapping and raytracing

Both methods involve casting a ray unto the reflecting object. It will be reflected. In reflection mapping - the intersection of this reflected ray with the environment map (texture) will yield the ...
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1answer
80 views

Can't figure out why my mouse picking code doesn't work

I am trying to create code to check for intersections between bounding spheres and the mouse. I get a mouse ray but it doesnt seem to point in the direction you think it should Attached is a ...
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2answers
79 views

How can I check if the mouse hits a quad in 3d, and where it hits it?

I have a sketch that produces the following: ...
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1answer
198 views

Raycast does not go to target position

There is a part in my script where I need to make a raycast check from my gun's muzzle to the enemy. This enemy could be anywhere around player. I found my ray is not connecting to the target ...
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3answers
321 views

Get closest point on box to line

Eventually this problem will be 3D, so I would like a solution that works in 3D. My player is looking forwards. There is an axis-aligned box on the screen (FOV is guaranteed to be 90, so boxes behind ...