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

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2
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3answers
43 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 ...
0
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0answers
16 views

Problem with cameracliping unity

Hello GameDev Community, i've got a small problem with figuring out a way to do cameracliping in the unityengine with raycasting i got two main problems the first being that my camera flicks ...
0
votes
1answer
15 views

Collision resolution moving Point to AABB with raycasting

This is probably trivial, but I'm having trouble making it work. I have a 3-coordinate world of particles simulated with Verlet Velocity. I only care for collision between their centers and a few ...
0
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0answers
86 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, ...
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1answer
49 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
31 views

How to resolve collisions when using ray-casting to predict the location of future collisions?

I ran into a question I can't seem to solve, while implementing the movement/ collision checking code for my game. The game is in 2D and all objects in my game use either AABBs or circles as collision ...
0
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1answer
34 views

OpenTK Ray Picking

I just can't get ray picking to work (I need to drop old working faedback mode, and replace it with color pick, but because my scene can have up to 300K+ objects it is reasonable to filter (it's a ...
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0answers
33 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 ...
0
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1answer
38 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 ...
0
votes
1answer
36 views

Would Raycast suffice for a game clock based on sun position?

I need help with some logic in my script. I created a dynamic day/night cycle that works fine in itself, but I want to add a game clock that works off the initial position of the sun (Directional ...
1
vote
1answer
33 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 ...
4
votes
2answers
138 views

Best way of writing pixel manipuliting-intensive applications with OpenGL/Direct3D

Recently I have been making little experiments with engines similar to old Wolfenstein 3D, Doom and Build, engines where the 3D rendering is entirely done in software and therefore you need full ...
1
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0answers
50 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 ...
2
votes
1answer
199 views

Is Physics2D.BoxCast a safe alternative to a row of raycasting?

Raycasting in rows is a common practice. Is using the Physics 2D BoxCast function a good alternative to using multiple raycasts spread out (an example use being collision detection in a custom ...
0
votes
1answer
101 views

How would I check the range against the entirety of an enemy object, and not just it's transform.position?

I want to be able to do range checks against the entirety of an enemy object, and not just it's transform.position. The enemy object can have it's side or nose within range, but range detection will ...
0
votes
1answer
35 views

Given a ray-intersect position on morphed mesh, how to compute that position at each morph target?

I'm working on an annotation system that allows a user to click on a mesh to attach a pin with a label hanging off it. It must be possible to pin an annotation on an object that's being morphed with ...
0
votes
1answer
97 views

Raycast Masks not working Unity3D

I'm having a problem with filters/masks when raycasting. I've created a LayerMask and then in the inspector selected the layer I want to ignore when Raycasting. however then I print out the name of ...
2
votes
1answer
167 views

Simple Doom style engine question

I've just started making a 'raycast' engine, a pseudo 3D FPS engine similar to Wolfenstein/Doom. I haven't done much reading so my implementation is likely very naive. My current working prototype ...
0
votes
0answers
83 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
1answer
144 views

My Raycast will not detect collisions in my Unity 2D project. What am I doing wrong?

I appreciate any help you can offer me. I created a script for a character controller that casts two rays below the player's gameobject. The rays extend infinitely and should collide with another ...
0
votes
2answers
117 views

Fast Ray Sphere collision code

I am looking at here and while it's well organized a lot of links are broken: http://www.realtimerendering.com/intersections.html I am trying to find fast code that will give me the hit point and the ...
0
votes
2answers
89 views

RayCast method always outputting False

I am having trouble executing a raycast to check if there is anything between the player sprite and a second sprite. This is my code : void Start () { play1 = GameObject.Find("player"); ...
1
vote
0answers
73 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 ...
4
votes
1answer
1k views

Blocking Physics Raycasts with Unity's 4.6 UI?

I use raycasts to determine hit objects and object selection in our game. I want these to be blocked by UI elements. Before I had a crude form of that where I just excluded rects of the screen, though ...
0
votes
1answer
52 views

How to represent ray and line segment in parametric form?(Visibility)

I am trying to implement this algorithm but am not sure how I am supposed to represent my ray and my line segments(walls). For the r_px/r_py do I just use the position of the light? For the ...
0
votes
1answer
81 views

Get fragment from mouse position

I have a painting app for texture artists that I am working on. I am able to paint to a flat canvas that updates the texture of a 3d object in an object viewer. Now I want to be able to paint directly ...
0
votes
1answer
91 views

How to reference the right object in Unity

So, I'm developing this small 2D project where I have a sphere that detects if objects get close to it from three different directions. I have successfully found a way to detect if an object ...
1
vote
2answers
100 views

How can I create a precise touch in Unity

Is there a way so that I can touch an object precisely? I have these aerial cars and there pretty tiny like 32 by 32 and it's hard to touch them using a raycast. I thought I'd spawn an object with a ...
1
vote
1answer
2k views

Graphics Raycaster of Unity; How does it work?

I'm making a small game for the first time and enjoying it thus far. The only thing that keeps bothering me is that I can't find a human explanation of what the graphics raycaster does. What's the ...
1
vote
1answer
55 views

Finding the side of a shape a ray intersects

For some simple 3D shapes (cubes, prisms) how can I determine which side a ray intersects, knowing the direction of the ray, and the normals of the shapes' sides. I thought of using plane ...
1
vote
1answer
200 views

What is the correct way to raycast on click?

I am using raycast from screen point to detect if the user has clicked/touched on something. The following fails 1/10 times; at first I thought due to the raycast missing the subject below, but after ...
-1
votes
1answer
139 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 ...
0
votes
2answers
301 views

Raycasting on Z in 2D

I'm making an isometric game in Unity. So far I have managed to render a diamond shaped board, with tiles that are aligned on the x and y axis (and the camera looks down the Z axis). I am spawning ...
1
vote
1answer
143 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 ...
0
votes
0answers
55 views

Ray casting: need to find start and end vectors

So I have a 3D object and I'm trying to implement Maximum Intensity Projection on it. I already started of using a default vector to show per pixel, namely: pixelCoord[0] = uVec[0] * (i - ...
1
vote
1answer
135 views

Raycast Flashing problem

Can anyone tell me what is wrong with me code? If you can see, whenever the player is in range of the raycast, the enemy turns red. But for some reason, even when the player has meet the requirement ...
0
votes
0answers
50 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 ...
-3
votes
1answer
78 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"); ...
0
votes
1answer
2k views

How can I raycast between two moving objects in Unity?

How can I raycast between two moving objects? I want to raycast from a moving enemy to a moving player. I dont know how to actually code to make the direction work. using UnityEngine; using ...
0
votes
0answers
33 views

Creating a ray with angle movement restrictions

In Unity is it possible to create a ray which has movement restrictions. As in creating a ray which is fixed to one point. When this point is moved around. The line is also moved around. But when the ...
2
votes
3answers
477 views

Unity Raycast shoots right through some objects

I made a melee combat system for my game. The code looks like this: var hit:RaycastHit; if(Physics.Raycast(transform.position,transform.forward,hit)) { if(hit.distance<=2.0) { ...
5
votes
2answers
206 views

How can I consistently identify location on a mesh from a raycast hit?

I am using RaycastHit.triangleIndex to identify a location on a mesh (very low poly). However, I have discovered that a given triangle on the mesh does not have the same triangleIndex value from one ...
3
votes
2answers
183 views

Intersection between moving circle and some squares

I'm developing a 2D game made of squares. What I need to do is check if a circle collides with any of the squares as it moves. I have a raycast function to check the same idea, but using a point. I ...
3
votes
3answers
213 views

Is there algorithm for boxcasting or thickray casting?

I am not sure what the correct name is called but here is my problem: I have implemented a casting ray function that works as expected. However, because I am using a loose grid structure, (ie, objects ...
0
votes
1answer
108 views

Ray casting problem using JOGL

I'm trying to port an old perfectly functioning ray casting implementation from my lwjgl project (FF pipeline) to a new project using JOGL and shaders. My problem is that my ray no longer intersects ...
0
votes
0answers
324 views

In libgdx, how do I get the intersection of a ray with a model instance?

I am using LibGDX trying to use raypicking to pick a point on a Mesh. I have two methods for this that don't seem to work quite right: /** * @param ray * @param intersection The vector to store ...
-1
votes
1answer
1k views

Unity 3D: Raycasting for gun hits

I am having trouble understanding raycast hits in Unity3D. I am trying to create an FPS game, so I have a gun, bullets and so on. My script for the bullets is: var Bullet : Transform; var Spawn ...
0
votes
1answer
505 views

Raycast doesn't point on the right direction

The raycast line im rendering is acting weird, it doesn't point where I want it to. I want it to point from the yellow object to the selected one but it draws it at another position. Here is my ...
0
votes
1answer
179 views

Raycast algorithm fails to collide with diagonal walls in specific locations

I'm having a problem with my ray-cast algorithm in a 2D tile-based universe. I feel the situation would be best explained with a picture, so here it is: The ray, represented by the blue line, is ...
0
votes
2answers
194 views

How do I raycast to detect which hexagonal tile was clicked?

I want to detect the hexagonal tile a unit is on upon clicking on the unit. I was thinking of using a ray cast I can't get it to work. I'm trying to get the raycast to shoot from the bottom of the ...