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

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Covert Minimap render texture to 3d space position

I am using Render texture to make a Mini Map it is working fine but now I want to go further on side map and want world space position from render texture click point. Is there any way available that ...
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1answer
24 views

How to refer to a object that has just been hit by a ray cast?

I would like to use RigidbodyConstraints.FreezeRotation;in order to freeze the rotation of an object that is picked up. The problem is I don't know how to refer (or call) the currently selected ...
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2answers
41 views

How to address raycast failures due to tiny holes in a mesh?

Problem: I have a racing circuit that is made out of tiles, each of which is made out of 2 triangles. I need to know over which tile my craft is hovering on; but since there are tiny holes between ...
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1answer
59 views

Pixel Picking vs Raycasting

I was recently introduced to a way of picking in OpenGL known as pixel picking (or color picking). From my understanding, how this is done is that the scene is rendered to the back buffer with a ...
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1answer
32 views

Limit Quaternion/vector3 axe in a certain interval

I have some trouble to understand, and handle Quaternion and Vector3. I'm improving the tutorial Tank of Unity: EDIT: Because a video explain so much better, there is a link to the 30 secondes video ...
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22 views

Unity 3d sendmessage to another script, with parameter of raycastHit?

I am trying to send message from 1 script to another, and need to do something like that: var hit : RaycastHit; .... if(soemthing){ checker.SendMessage("MakeEffect", hit); } and another script: ...
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2answers
31 views

Unity3D - Determining if a spherical object is grounded using raycast

I'm making a game revolving around moving a ball around a space. My game has a jump mechanic, so I need to know when I'm grounded in order to determine when I'm able to jump. Best way to check this is ...
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23 views

How to convert Non-Axis Aligned Bounding Boxes to AABB

I'm trying to write a raytracer to render boxes (cubes) that are arbitrarily rotated, i.e. not necessarily axis aligned. While I'm reasonably comfortable ray-tracing an axis-aligned cube, I don't know ...
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2answers
131 views

Need help with a field of view-like collision detector!

I ran into a trouble while making a field of view for my character. I figured how to make it work with a Linecast, but what I really need is a cone-shaped field, so that the character can detect ...
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2answers
96 views

How can I prevent 2D teleportation from teleporting through solid objects?

In my 2D game, the player is able to teleport to any place on the screen with the click of the mouse button. What I am trying to prevent is the ability to teleport across solid objects. If the point ...
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20 views

Simplifying grid based intersection checking to not need 16 checks from each corner

I'm working on an "underground prisons and fire breathing lizards" inspired CRPG. So far I have implemented a "path drawing" method to, well, show the grid cells that would be involved if one were to ...
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78 views

How can I improve my ray casting algorithm

So I finished coding this ray casting algorithm in C++ and I feel like it could be improve, despite that, I believe that it is really good since it is coded using SFML. Here is the algorithm in C++ ...
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1answer
77 views

Ray casting fails when it shouldn't

I have two objects that should collide. My player should stand on a ship. The position where my player stands, is exactly on the edge of two adjacent triangles (in the ship's model). To Check for ...
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1answer
66 views

Raycast from ScreenCenter hits object but does not return its tag

Here is my code: using UnityEngine; using System.Collections; public class Crosshair : MonoBehaviour { public Camera cam; RaycastHit hit; Quaternion rot; // Update is called once per ...
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54 views

Find which object is clicked on 3d scene

I am using GamePlay3D engine. I have on scene a couple of 3d objects and I want to make them clickable. How to find when I click which Node/Object contains given projection point? I tried with code ...
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1answer
49 views

Raycast a ray to the tip of another ray

I'm using unity to raycast a line from the center of my camera viewport to a world position (yellow line). I also want to cast a ray from the center of my character to this same point (blue line). I ...
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26 views

Drawing Ray from ray picking is not working correctly

I have been implementing ray picking to select squares in my opengl program. I tried to follow this post I found http://gamedev.stackexchange.com/questions/109579/algorithm-for-triangle-picking after ...
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44 views

How to generate mesh at runtime using raycast points?

I'm trying to make a clone of the trail/line renderer with the difference that everything is perfectly flat, i.e. the faces are not designed to face the camera. I'm using two raycasts to get the ...
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1answer
92 views

2d raycast collision problem

I am currently making a 2d top down game in unity and have stumbled upon a problem with my raycast collision. I want my green player to stop moving when colliding with a wall, therefore i made my ...
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1answer
105 views

Raycasting. Corner trap

In my top-down game character moves to target (pathfinding) also avoiding obstacles with Raycasting(Central ray with whiskers), but situation like on picture causes shiver and unneeded turning ...
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1answer
82 views

How to find a material through a raycast in Unity 5?

I have an empty object with a script on it and I want to be able to move the empty over other objects and then have it print out the name of the material for the triangle that it's hovering above. ...
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0answers
18 views

Finding intersection in CPU ray casting

I'm trying to implement a ray casting on CPU, for each pixel I have a ray. I'm reading the data which is stored in a rectilinear grid. I'm trying to find the intersection but I'm not sure how to do ...
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68 views

Simulate a touch on a point where ray hits in Unity

I want to simulate a touch input on the position where a ray hits an object, and only if it hits something. I know that it's not common to do it with a raycast, but I need it this way for the HTC ...
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28 views

Raise an object off from the surface of another object set by raycasts

I have a basic FPS and I just added in bullet holes. The way it works is when the mouse is clicked, a method is called in the animator that fires a raycast from the nozzle of the gun outwards, and ...
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109 views

OpenGL RayCasting and Intersection with plane

I have been trying for a couple of days to raycast. I have a Renderable/Texture/Primitive/Whatever placed in the WORLD at 0.0f,0.0f,0.0f, and when I click the mouse I want to know at what X,Y ...
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2answers
63 views

Wall checking not working correctly

Basically I am working on side scrolling 2d game. For that I want to check whether player is collided with wall. I have written some code for it but can't able to decide where I have done stupid ...
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2answers
146 views

How do you avoid lag with Three.js and mousemove?

I'm trying to create a browser moba-like game using three.js. I'm using WASD for movement and the player rotation follows the mouse with mousemove then lookAt() the intersection. The problem: As I ...
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0answers
33 views

Combining Two Sets of JavaScript

So I am fairly new to programming and I am trying to learn by making a simple game. I watched to different videos on ray cast shooting and one of them has code for bullet hole decals that I wanted to ...
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1answer
63 views

Find out hit child with RaycastHit

Let's assume having a (2d-) gameobject with 3 images: Head, body, feet. By using RaycastHit2D I can find out if the gameobject was hit (for example by the mouse): RaycastHit2D newSelectedObject = ...
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1answer
169 views

Raymarching on a Hi-Z buffer in GLSL

So I'm trying to implement Screen Space Reflections using a Hierarchical z-Buffer in GLSL. I'm following the approach from GPU Gems 5 and the Frostbite presentation linked here ("Stochastic ...
4
votes
3answers
150 views

How to test for adjacency?

I need to come up with a better way to test for adjacency in a grid environment. Imagine that the blue is water, the green is land, and the red dot is a character. What I need to do is efficiently ...
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0answers
69 views

How to make dynamic DOF from mouse position in Unity 5?

I found a video a while ago for how to make a dynamic DOF in unity. It fires rays from the camera and positions an empty at the location that the ray first hit. How can I change this so that it ...
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1answer
64 views

2DRaycast is shooting slightly in wrong directions

I wanted just a simple 2DRaycast, which points from my character to my mousePointer. So I found the following code in the Internet, most people seem to use it like that. So I tried it, but it isn't ...
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1answer
244 views

Why is Raycast hitting masked layer?

Many questions have been posted on this topic but I'm facing a weird behavior which I could not find an explaination for. I perform a raycast giving it a LayerMask parameter which is defined as ...
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1answer
146 views

Ray & Segment Intersection

I'm writing some code to check intersection between all of a rectangles segments and a ray. It will sometimes use the Left and Right side of the rectangle as the closest face hit (face DA & BC) ...
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3answers
383 views

Unity C# - Raycasts, How to Ignore Triggers?

Let's say I have a Raycast, but I don't want it to collide with any triggers. I don't want to change the Project settings since that's a little inflexible. How can I have a Raycast ignore any ...
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0answers
115 views

Use xbox right analogue stick for ScreenPointToRay

I have done a tutorial where the player rotation is controlled with raycasting which follows the mouse pointer. I have been trying to change it to follow the right analogue stick on a xbox controller. ...
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1answer
103 views

Continuous Collision Detection

So I'm playing around with the separating axis theorem and collision. Obviously the problem of what face it collided with arose. I need the unit normal which is tangent to that face it collided with ...
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2answers
445 views

Unity - Raycast not hitting to BoxCollider2D objects

I'm working on 2D and I have a Quad as background. And some wall sprites over this quad : I'm instantiating wall prefab sprites over quad when user click to somewhere. But I don't want to ...
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1answer
294 views

Click to move - get NavMesh layer

I'm using NavMesh, and NavMeshAgent for my character movement and Pathfinding. I made a testing NavMesh with 2 area layers: 0 = Walkable 3 = Water. In have a click to move script, and i need to ...
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1answer
14 views

characterController reference issue

I am trying to move my character to point that taken from mouse position. here is my code: private Vector3 hittedPoint=Vector3.zero; if (Input.GetMouseButtonDown (0)) { Ray ray = ...
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1answer
101 views

Getting ray using gluUnProject or inverted MVP matrix

I've read a lot of topics here, on SO, opengl.org etc. Example how gluUnProject should work (from NeHe tutorial): winX = (float)x; winY = (float)viewport[3] - (float)y; glReadPixels( x, int(winY), 1, ...
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2answers
86 views

Cursor position to a 3D ray using angles

I've been stuck for a month trying to get gluUnProject working. After my attempts to use gluUnProject failed (as well as attempts to implement gluUnProject functionality manually) I implemented method ...
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2answers
68 views

Shading a 2D visibility mesh to act like a light?

I have a visibility mesh made by raycasting: https://my.mixtape.moe/omjlgr.webm Right now, I'm using a shader to color the mesh white and fall off with distance and radius (the texCoord in this case ...
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vote
1answer
407 views

Is it possible in Unity to Flip a 2D Sprite Without Flipping the Object it is Assigned to?

I 'built' (followed a tutorial) on a collision detection system, and when I flip the object to go left and right the collision messes up. So I have three options; find a way to modify the collision ...
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votes
1answer
51 views

Simple voxel-block melee removing script

I'm trying to create a voxel based game, now I want my character to remove blocks with a melee weapon, but I'm not sure which way to go. I mean is it the only way to get the Block with a raycast? I ...
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2answers
188 views

Raypicking / raytracing in OpenGL

Alright, so before you down vote saying that OpenGL doesn't support rays for rendering, please read: So I want to detect a quad in opengl 1.1( I don't want to use opengl 3.0). I wanted to detect it ...
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0answers
62 views

Unreal engine: How to get FHitResult.FaceIndex?

When I do PlayerController->GetHitResultUnderCursor(ECollisionChannel::ECC_WorldDynamic, false, TraceResult); TraceResult.FaceIndex is always -1. Here @OriCohen says that I have to "use a ...
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0answers
161 views

Unreal Engine 4 Line Trace Error

This is the error that I am currently facing: PlayerPawn.cpp.obj : error LNK2019: unresolved external symbol "public: bool __cdecl APlayerPawn::Trace(struct FHitResult,class AActor *,struct FVector ...
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3answers
146 views

Unity - Check if object is facing Vector3 coordinates

I am having a hard time figuring this out, I want to have objects that move around randomly, and when they get new coordinates to move towards, face them, and then move. Here's explained: Target ...