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

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3
votes
2answers
247 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 ...
2
votes
2answers
96 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 ...
-2
votes
2answers
164 views

Libgdx, find Vector3 direction

I am using Libgdx along with Bullet physics. I have a vehicle moving. I would like to use a ray from the vehicles origin and in the vehicles forward direction. How can I create the forward Vector3 ...
3
votes
1answer
233 views

Problems with Raycasting Requirements

Im working on a script which kinda works like an Enemy AI. Its kinda like a detection system with requirements that are required to be met. This is a recent question i asked using my code Raycast ...
2
votes
1answer
250 views

How to Reciprocally draw on a 3D mesh and 2D UI Image in Unity?

My question is a bit involved so I'm going to split it into parts and attach a picture. 1) In Unity I'd like to be able to draw a line on a 3D worldspace mesh with the mouse. 2) As I'm drawing on ...
1
vote
1answer
24 views

Raycast will not hit generated box colliders at initialization

In my map class I have an algorithm that is generating and merging box colliders together. These belong to the layer "Ground". After that, in some places on my map I'm generating some new cubes on-...
1
vote
1answer
30 views

How to Ignore Raycast for Boxcollider2D by layer or boolean?

how can I ignore Raycasting for specific object,perhaps you say use Queries Hit Trigger but when I use it Ignore all Raycasting for triggers but I want filter Ignore Raycasting for some objects I need ...
1
vote
1answer
54 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 ...
1
vote
1answer
187 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) ...
1
vote
1answer
72 views

How can I determine “exact moment” of collision with ray casting?

I'm currently brainstorming how the physics for my game engine is going to be handled. It's top down and I'm thinking of using ray casting for collision detection. I've reached two potential problems (...
1
vote
1answer
324 views

Raycast, UI and Update Question

I have movable objects in a scene. When Raycast hits an object, I have a hovering UI that moves to a retaliative distance from the hit object. When the object is dragged, the UI's position is moved ...
0
votes
1answer
56 views

Project camera-to-pixel ray in world coordinates

I'm trying to implement a very simple ray tracing function but I have a problem with projecting the camera ray (from camera to pixel) to the world space. In the screen coordinates have the pixel ...
0
votes
1answer
84 views

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 ...
0
votes
1answer
137 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 (...
0
votes
1answer
430 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 ...
-1
votes
1answer
338 views

2D bouncing formula doesn't work properly

am new to unity, and i am trying to create a bouncing ball, so i've did many researches about bouncing realted physics and i found a formula : Formula: -2*(V dot N)*N + V Where V is the velocity ...
-3
votes
1answer
103 views

Direct raycasting from moving point A and moving Point B

I am attempting to raycast from Point A to Point A (both moving points). I dont understand the comcept of raycasting (direction). Update() { player = GameObject.FindGameObjectWithTag ("Player"); ...
2
votes
0answers
41 views

SFML Raycasting Problem: Textures not displaying propely

I have been lurking on gamedev.Stackexchange for a while now and finally have a question to ask. I have been working on a simple raycasting engine (like wolfenstein 3d) using the SFML Graphical ...
2
votes
0answers
38 views

Unity raycast misses convex mesh collider

I have a bunch of fighter AIs that are doing attack runs on a target (Currently just a cylinder). It is designed to veer off course the moment it gets too close and loop around for another attack ...
1
vote
0answers
24 views

Retreive 3d World Map coordinates from touch/click input with LIBGDX?

Problem: I am trying to create an RTS style interaction. I want to be able to click on the map and have characters move to the click location. I haven't been able to figure this out, even after ...
1
vote
0answers
56 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 ...
1
vote
0answers
132 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 ...
1
vote
0answers
34 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 ...
1
vote
0answers
85 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 doesn'...
1
vote
0answers
236 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 ...
1
vote
0answers
136 views

Issues with 2D raycasting lighting under limitations of HLSL 3.0 pixel shader

I've been writing my own HLSL pixel shader for dynamic lighting using raycasting. Unfortunately, since I'm using this out of XNA, I can only use up to ps_3_0. As you can see, the limitations ...
1
vote
0answers
93 views

Can I render 3D objects in Ray Casting engines?

I was gathering some information on the glorious Ray Casting technique. As far as I've understood it's not a complete 3D rendering, and that's why objects and NPC's are often displayed as simple ...
1
vote
0answers
152 views

parented/constrained object transform lags when moving character in unity3D

Hi I have a simple raycast-base gun that emits particles along it's path to fake bullets. Whenever I move the camera/character- the particles are misaligned, as well as anything else I try to modify ...
1
vote
0answers
616 views

How to identify whether the boundingvolume intersects with walls or floor when it doesnt return normals?

My game in jMonkey is the kind that use will have to place objects in a scene (which consist of walls and slabs and floor). All my models are centered at origin. When the user click a point I use ray ...
1
vote
0answers
103 views

Performance issues with visibility detection and object transparency

I'm working on a 3d game that has a view similar to classic isometric games (diablo, etc.). One of the things I'm trying to implement is the effect of turning walls transparent when the player walks ...
0
votes
0answers
40 views

Floor casting in a Raycasting engine

I'm trying to create a pseudo 3D, raycasting engine with plain JavaScript rendered on the HTML5 canvas. In short: a Wolfenstein 3D clone. So far I have gained inspiration from the following guides: ...
0
votes
0answers
59 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: ...
0
votes
0answers
28 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 ...
0
votes
0answers
21 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 ...
0
votes
0answers
86 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++ ...
0
votes
0answers
57 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 ...
0
votes
0answers
27 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 ...
0
votes
0answers
19 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 ...
0
votes
0answers
111 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 ...
0
votes
0answers
31 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 ...
0
votes
0answers
158 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. ...
0
votes
0answers
83 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 ...
0
votes
0answers
215 views

How do you set up the physics for a tank?

My goal is to make some tank like vehicle since there is not a suitable one in unity5 store yet. First I tried wheel collider, could not get it to work. I tried to use raycasting and fixed joint, ...
0
votes
0answers
169 views

Trouble with Raycast Selection using OpenGL

I am currently having trouble with a custom model editor in which I want to implement model selection (eventually featuring face selection to have something like "click-and-drag" to extend the cubes). ...
0
votes
0answers
53 views

Why Reducing fragments by increasing geometry vertices turn out to be slow?

I am developing a ray-casting program by OpenGL. At first I made a large bounding box including the whole volume and render this box, which triggers the ray-casting. I'm trying to optimize this ...
0
votes
0answers
57 views

Organization of world/eye/clip bounding volumes for ray picking

I currently have objects defined in world coordinates and also other "overlay" type objects defined in eye or clip space. I want to be able to select objects (ray picking) from both the overlay or ...
0
votes
0answers
293 views

Block picking / ray casting through 3d blocks always slightly off

I've been working on adding a line-of-sight/ray-tracing system to my 3d block-world game. I've tried several different methods and they all work fairly well. At the moment I'm using something similar ...