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

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2answers
83 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
77 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 ...
1
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1answer
54 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) { ...
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1answer
127 views

Ray picking gives inversed results

I'm trying to do a simple ray picking implementation to allow a user to select a cell in a grid rendered in 3D. I'm almost there, but I've ran into an issue which I can't seem to solve. Consider the ...
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votes
1answer
52 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"); ...
1
vote
0answers
301 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
88 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
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0answers
21 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 ...
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0answers
26 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 ...
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0answers
52 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 ...
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0answers
65 views

(Unity 3D) Why are bone colliders with an Animator Controller so finicky?

I have an NPC with colliders parented to its bones using the Unity ragdoll wizard. It also has an Animator Controller. The problem is, sometimes those colliders just don't work right. They're targets ...
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0answers
42 views

Mouse RayCast quadTree in XNa

Hallo i have quadTree terain and every quadNode have BBox.I have made function to return center of hitted quadNode BBox. But it's returns my bad calculations..... I have pitchedYawRoll camera ,it's ...
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0answers
143 views

Most efficient AABB - Ray intersection algorithm for input/output distance calculation

Thanks to the following thread : most efficient AABB vs Ray collision algorithms I have seen very fast algorithm for ray/AABB intersection point computation. Unfortunately, most of the recent ...
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0answers
60 views

How to raycast select a scaled OBB?

I have the OBB picking code to select an OBB with code inspired from Real time Rendering 3 and opengl-tutorial.org. I can successfully select objects that have been moved or rotated. However, I cant ...
0
votes
0answers
65 views

Libgdx get 3d intersection coordenate

Is there any algorithm that takes an arbitrary point coordinates as input and determines which is the 3d coordinate where the ray intersects the mesh? Use case: The mesh is rendered on the screen, ...
0
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0answers
173 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 ...