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

learn more… | top users | synonyms (1)

0
votes
0answers
13 views

Unity - Remove GameObject [on hold]

I have been developing a game in which we need to be able to select a GameObject (ingredient) and deselect it, and that by selecting that GameObject it adds a +1 to the counter. My objective is to use ...
2
votes
2answers
379 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
1answer
33 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
218 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
47 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 ...
2
votes
1answer
224 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
1answer
111 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
2answers
55 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 ...
0
votes
1answer
347 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
vote
1answer
163 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
50 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 ...
2
votes
2answers
172 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
2answers
73 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 ...
0
votes
2answers
36 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
282 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 ...
1
vote
1answer
58 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
0answers
173 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
1answer
33 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 ...
2
votes
1answer
84 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
72 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
87 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
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 ...
0
votes
1answer
72 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
32 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
39 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
138 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
26 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
108 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
1k 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
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 ...
-1
votes
2answers
3k 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
83 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
56 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
50 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
188 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 ...
0
votes
2answers
191 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
48 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
112 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
108 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 ...
0
votes
0answers
29 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 ...
1
vote
1answer
49 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 ...
1
vote
0answers
118 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
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 ...
1
vote
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 ...
2
votes
1answer
77 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 = ...
4
votes
3answers
160 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 ...