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

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8
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3answers
854 views

How to handle RTS Click-And-Move in 3D Space?

How can I handle the click-and-move in a complete 3D space? It is easy to handle on a 2D plane by a simple raycast, but this is not the case in 3D since there is no end-plane for a raycast to get an ...
0
votes
1answer
28 views

Raycasting against my plane does not detect collisions in Unity

I'm trying to keep the camera above a plane which acts as the ground, so I wrote this bit of code: RaycastHit hit; if (!Physics.Raycast (transform.position, new Vector3 (0, -50, 0), out hit, 5)) { ...
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 ...
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 ...
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 ...
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) ...
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 ...
1
vote
1answer
327 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
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 ...
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 ...
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
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 ...
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-...
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 ...
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 ...
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 ...
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
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, ...
2
votes
2answers
410 views

How do I find voxels along a ray?

I am making a voxel engine, and I want to make it possible to create and destroy voxels with the mouse. I use C++ and OpenGL, so C++ examples would be best. So far, I have the camera position and ...
0
votes
2answers
61 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 ...
1
vote
1answer
69 views

How to get color or value from material with shader?

I have a sphere with a shader with colors for specific heights and I want to get the value at the cursor(height) or color of the point the cursor is on when clicked. Is there a good way to get this ...
0
votes
2answers
38 views

Script no longer working now that it is attached to a child object. Why is this?

So I decided I wanted to make this script part of a separate swap-able weapon so I made a child and put the script there. Before the script worked fine but now it won't work. The script works as ...
1
vote
1answer
75 views

Checking if point is inside the mesh via raycasting - where to cast rays?

I need to voxelize triangle meshes which involves testing if a point is located inside or outside the given mesh. I have just implemented a basic algo based on raycasting and checking the number of ...
0
votes
1answer
37 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 object....
2
votes
1answer
88 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 ...
1
vote
1answer
93 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 ...
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
1answer
33 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 ...
0
votes
1answer
84 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 ...
4
votes
1answer
2k views

Problems implementing a screen space shadow ray tracing shader

Here I previously asked for the possibility of ray tracing shadows in screen space in a deferred shader. Several problems were pointed out. One of the most important problem is that only visible ...
0
votes
0answers
60 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: ...
1
vote
2answers
51 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 ...
3
votes
2answers
171 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 ...
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
1answer
103 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 ...
0
votes
2answers
123 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 ...
0
votes
3answers
2k 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
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 ...
-1
votes
2answers
4k 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
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 ...
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
281 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 Screen-...
0
votes
2answers
202 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 ...
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 ...
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 ...
0
votes
1answer
142 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 ...
0
votes
1answer
237 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. (...
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 ...