Questions tagged [3d]

3D refers to three dimensional space where coordinates are represented with X, Y and Z values.

189 questions with no upvoted or accepted answers
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247 views

Find the largest empty space inside a cube populated with a point cloud?

Lets say we have a set of points (x, y, z) where we know 0 < x < 1 (same for y and <...
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174 views

How to correclty play the sounds in a 3D enviornment?

I'm currently working on an XNA game with C#. I've been looking into 3D Sounds recently as this is the next objective on my list. I've found several tutorials online and they don't work to the ...
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40 views

Connecting a model's joint to the joint of another model

I am trying to figure out the math behind orientating and translating a model so that a specified point on the model will connect with a specified point on another model. For example, given the ...
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164 views

How do I detect collisions between a particle-based net and a ball?

I've implemented a net using Verlet integration and many points connected with constrains; like this demo, but in 3D. I want to implement collision detection between this net and a ball (like in a ...
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233 views

X, Y, Z rotation around camera

I'm making a 3d orthogonal-projected, game using painters' algorithm in java. I'm able to rotate the objects with incremental rotations (e.g. rotate all objects 10 degrees) using affine ...
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257 views

XNA HLSL UV Mapping

I was testing my hlsl lighting shader, I've copied it from a tutorial and it works perfectly, but all the meshes in the model needs to have texture coordinate, I guess this is because this part: <...
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160 views

JMonkey scrolling 3D text

I need to make a scrolling 3D text, which is not a gui. I have a 3d box display over which I should render a long scrolling text. I can render and move text, but how do I cut/make invisible the part ...
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336 views

How can I find the collision response between a moving sphere and cube?

I'm implementing my own algorithm for sphere and cube collision response. So far I'm able to only test if both of them overlap. My problem is: A cube is rotating around its axes i.e x and z axes. And ...
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528 views

Closest distance from 3D point to vector line

First let's have a look at my little drawing: I have an origin point p1 defined by x, y and z co-ordinates, and a vector v given by x, y and z magnitude. I also have an arbitrary point, p2, given ...
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621 views

Adding 2d hud/gui to a 3d game engine which has no 2d features

I have been following the 3d game engine tutorial series made by theBennyBox for a few months now, and have finally decided to create a game with it. My problem is that it is a 3d only engine which ...
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747 views

How to rotate a line in 3d space?

I am trying to figure out direction vectors of the arrowheads of an arrow. Basically I'm given a normalized direction vector ...
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205 views

How do I make a shaped fluidSurfaceActor in UDK?

I'm trying to make a fountain for my level in UDK. I've made the base of a fountain by using a Cylinder build and now I'm trying to put water in it. I want to use ...
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192 views

Rotate view matrix based on touch coordinates

I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing ...
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509 views

How do I remove control points from imported curve in Maya?

When I create a path from an Illustrator file, it adds extra control points for bezier handles for each point in the AI file, even though I don't drag out the handles in Illustrator. All my points in ...
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69 views

Blender: calculation of elevation and rotation angle from plane

I have a generic plane (any location, any rotation around every axis) with its normal axis passing by the center. Then I have a generic point and I need to find the elevation and the rotation angle ...
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0answers
356 views

How can I implement collision for a “pseudo-3D” game?

I'm looking for high level implementation details, not specifics. I've worked with bounding boxes before in some 2D games, but I'm currently tackling a "2D + depth" (2.5D?) style game along the lines ...
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400 views

Moving an object (pong paddle) along the x,y axis in 3d-space with mouse/touch

First of all: Sorry, my English isn't quiet good, I'm very new in 3D and I'am using JMonkeyEngine. What I would like to do?: A 3d pong game and I want to control the paddle with the mousecursor and/...
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100 views

iSGL3D Occlusion Culling

I was testing a cool 3D Scene Graph Library called iSGL3D. Since I found some functions called alpha culling for displaying partly hidden objects (making the ones in front transparent). I was ...
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864 views

What is the best way to implement collision detection using Bullet physics engine and a track generated from a curve?

I am developing a small racing gam, the track is generated from a curve. As said above, the track is generated, but not infinite. The track of one level could fit with no problem in memory and will ...
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53 views

How i can sign and/or group a specific set of vertices in a 3D file container like OBJ ? - in Blender

I would like to export a 3D model with each part having a name or a label if you will. For example i would like to export a model of an human body and name each part in specifics vertex groups like: ...
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1k views

How to turn a 3d camera (in HTML5 2D Canvas)

A few years back I started experimenting with 3d in canvas. Everything went pretty well untill I had to to turn the camera, I couldn't get it done. A few days back I just happened to stumble upon ...
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615 views

3D collision detection on non flat surface

I am developing a game which needs an accurate collision detection algorithm, when an object travels down a slope which isn't flat. To be more precise I need to simulate a skier who travels down a ...
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1answer
325 views

Game Modeling good practice regarding quads and ngons

I'm asking myself if using quads is really the better practice instead of using ngons (for flat surfaces!) when it comes to game modeling. I often read this and saw models that look like this (96 ...
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1answer
380 views

FXAA Shader turns image upside-down

I'm trying to use an existing FXAA shader for anti-aliasing, which works, but when I try to run it, the filtered image is upside-down (vertically flipped) ...
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27 views

Unity3d:Detect a collision between an image and a sphere

So, I just realized, an image with BoxCollider2D wont detect any collision with Sphere with <...
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1answer
49 views

How can I export a 3D model with keyframes to use in Blender?

I'm currently trying to export some 3D data and load it into Blender, but I've encountered some problems at the time of processing the meshes. They all have keyframes (nothing too complex, just ...
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36 views

Adding spread to velocity Vector3D

I am trying to give an object a velocity spread (e.g. shotgun bullets or particle effect). ...
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0answers
29 views

Generation of a 3D loop the loop with minimal steering required

How would I generate a surface which resembles a loop-the-loop shape like this one described here? After triangulation of the surface, lets say I start at one end with some initial velocity which is ...
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45 views

converting 2D radar to 3D

I'm playing a 3D game. I got a camera which can be set in first-person and third-person view. I already know how to grab entities around my main character and display them in a small 2D image, in a ...
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0answers
12 views

How to organize the highlighting of a 3D object with which contact occurs?

I want to repeat a certain "Select (); - Deselect ();", as shown in the screenshot. Prompt with advice how to implement it or what you need to read to implement this feature. I tried to found ...
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1answer
52 views

Assigning relative force to a projectile fired while orbiting a sphere

Projectile Not Correctly Inheriting Parent Velocity (Unity3D) So I am trying to incorporate the above person's changes into a script I am making although I'm no great coder and I'm not even sure ...
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26 views

Find mouse pos in 3D space?

I have a game where there is a set of tiles rotated 45° away from the camera. I want to work out what tile is being hovered over by the mouse, and for that I need to translate the mouse pos on the ...
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38 views

Problem with repeating objects in array when already in the array

When the player move forward then paint is instantiate and stored in the array, even if the paint is already in the array it will again be stored in the array. But I don't want to repeat any paint in ...
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8 views

How to resize Unity Cinemachine Dolly track?

I recently imported a 1:1 scale building .obj model into unity and I'm trying too use cinemachine dolly track to navigate the interior of the building. The problem is that the visual of the dolly ...
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30 views

Value returned is different to the value of the original object

I was wondering if someone could help me resolve a small roadblock I encountered aha... Essentially, in my Pickup.cpp file you can see that I'm trying to establish a behaviour wherein the object being ...
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54 views

Help to Code Bowling Like Feature in Unity for Mobile

I need Code or Guidelines for Touch Feature. When We Drag ball back and Send it Forward. I am Making feature like bowling, and I need Player to add force while dragging back and also curve the path of ...
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1answer
50 views

Dealing with curved lines in GJK

I'm currently using a GJK implementation (supported by EPA for penetration) and I'm trying to optimise the calculation times of distance calculations. One of the biggest hits is trying to solve for ...
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2answers
40 views

How can I edit collisions in Unreal Engine?

I made a concave house model. When I import it to Unreal Engine it generates a simple box collision that covers the full mesh. I need a collision that only covers the walls. How can I generate one or ...
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1answer
62 views

Quaternion.LookRotation with Joystick

I am having an issue i cannot seem to figure out within my code. What this code does at the moment is that it rotates the 3D Model around the z axis but i need it to rotate around the y axis. Any help ...
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1answer
61 views

Orbital rotation equation

I am developing a space sandbox (3D). Now I am working on an asteroid belt around a planet. I have an Asteroid class and an ...
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24 views

Managing character movement in 3D in AR

I'm working on an ARKit project where I need to manage the movement of an object (white box) on a plane (blue square). The characteristics of the environment are : The box can move only in 2D along ...
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0answers
9 views

Detecting when a single group of blocks is broken into multiple groups

Let's say you have an array of blocks (AABB), where each block is touching or intersecting any number of other blocks. Together they make up a larger object, and because they're all touching, you can ...
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1answer
110 views

How can I create a tunnel/parallax/depth effect based on mobile device tilting?

I would like to create applications similar to what's displayed in these videos: VR Tunnel Live Wallpaper for Android The parallax view Part 1 These mobile application are supposed to react to ...
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20 views

Is it possible to generate a 2D surface that approaches certain mesh, and then a specialised ray-tracing function for it?

As an example, suppose we are trying to ray-trace a sphere. There are two options. The first one is to build a mesh of triangles approximating the sphere and ray trace it. Unfortunately, the more ...
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126 views

Godot: Possible to create a 2D tilemap and set it as a texture for a 3D surface?

If I created tilemap of some sort of pattern or image and wanted to set it as the texture of a 3d surface or 3d model, how would I do it?
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1answer
113 views

Problems when rotating object to animate in Unity

I am trying to create some animations for a car model in Unity and I have a problem with the rotation of the wheels https://imgur.com/a/HcWxyob Here I can set the rotation properly as the pivot ...
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2answers
74 views

Adding force to a 3d object in a 2d scene

I have a 3d game object placed in a 2d scene (top-down view) in Unity. I want to add force to the object to move it in the direction it's facing. I attached a RigidBody2D component to it and when I ...
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1answer
42 views

How do I determine distance of a point within a ProBuilder mesh?

As in the title, I have an effect prepped for my game which applies certain derived parameters to a post-processing effect after the player enters a boundary I created with ProBuilder. Finding how far ...
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30 views

Efficiently drawing a batch of meshes?

I was playing around with some isometric ideas, I want to create fairly large maps with a couple of Z levels, much like the older X-com games. I figured I am probably way better off to draw the quads ...
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58 views

Setup golf ball physics

I am developing a simple Golf game as shown in the below image. I am facing below issues: Even if I apply small amount of force, the ball continuous move along the grass? Grass friction is not ...