# Questions tagged [3d]

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

222 questions with no upvoted or accepted answers
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### How to create skeletal animation data for a skirt?

Please think of this in an engine-agnostic way first, and then we can talk about specific engines. In my game, I have a 3D character which is wearing a hakama (think of it as a long pleated skirt). ...
1k views

### Displaying text on a 3D plane

I am busy with a pet project where I am trying to create a Collectible Card Game in 3D. These cards have Hp and Damage etc. but I cannot find a way to neatly display these values. I tried to use a ...
3k views

### Matrix rotation wrong orientation LibGDX

I'm having a problem with matrix rotation in libgdx. I rotate it using the method matrix.rotate(Vector3 axis, float angle) but the rotation happens in the model orientation and I need it happens in ...
6k views

### Handling movement on sloped surfaces - clamping character to sloped surface

I've noticed that a lot of people seem to have this issue but I've yet to find an actual working solution - when a rigidbody-based character controller (I'm not using Unity's character controller) ...
548 views

### Implementing proportional navigation in 3D

Good afternoon guys, a = N * λ' * V is the formula for the commanded acceleration required to hit the target, where N is the proportionality constant, λ' is the change in line of sight and V is ...
280 views

### How to generate a multiplier map for radiosity

I am following this tutorial: here I am at the part where you are creating a hemicube. I have got the code to render the scene into a texture and therfore an array. Now how can I generate a so-called ...
434 views

### Collision detection problem in XNA4/Monogame

I have been trying to get 3D collision detection working for a while and I think (hope) you people can help me. For my project I have created a 'sprite3d' kinda class which is called ...
387 views

### 3D Physics Engine Collision Response: Solving Simultaneous Collisions via equation

I have been implementing a basic physics engine for a small game project I'm working on. It has very specific requirements, so I decided to try and write my own physics engine to meet them. I found ...
227 views

### Perspective correct texture mapping in iOS Metal

I tried various ways of getting the interpolation work and generate a perspective correct image, but none of the suggested ways works. My current code is: ...
163 views

### How do I get an object to rotate in world space via RigidBody.AddTorque?

I'm getting really discouraged because I can't seem to figure how how to rotate my object via Rigidbody.AddTorque like it is on a figurative global turn table rather than a local turn table. Another ...
124 views

### OBB vs Frustrum collision detection

Some definitions: An oriented bounding box (OBB) is a rectangular block which can be represented in many ways, as a collection of eight vertices, a collection of six planes or others, for this ...
52 views

### Weird texture applied

So I applied the baked texture (on the right side of screen shot) but it shows in this manner. What is the problem? I made the model in Blender and also the baked image. The house consists of ...
518 views

### JavaFX import 3D models

I want to import some 3d models to my javaFX application. In javaFX I can create rectangles, traingles, circles, pentagons. Those figures can be filled with color or filled with image. They are ...
133 views

### Creating “Run over by car” effect in unity using spotlights only

I'm doing a project where I need to simulate a car running the character over. It's happening in a completely dark space, so I want to create it using spotlights moving towards the camera until the ...
341 views

### Rigid body falls through static mesh even though collision is detected

I'm using Jitter Physics to create a game. For testing, I have ball (a spherical rigid body) falling onto a small box-like mesh. The problem is that the ball falls straight through the floor, even ...
532 views

### Unity3D CrossPlatformInput StandardAsset Multitouch

I have a small game I am working on, and I am trying to add touch support to it. Before I try to add that into the real game I wanted to do a test run on a small project. The project consists of a ...
120 views

### Retrieve 3d models from a server in unity

I have 10 3d models which are about 8mb each..Now, should I store these 3d models in my apk or will it be wise to store it in a server and then retrieve it?.If so, how can I do that?
204 views

### Get mesh height at position

Me and my friends are creating a simple 3D game in LibGDX and are currently trying to implement simple collision detection with the terrain (ground). For this I thought the best way would be to simply ...
105 views

### How to disable and enable a randomly generated prefab in an endless runner 3d

Hi all I have been experimenting the endless runner game for some time and needed to optimize it. I read some articles about optimizing my game and it says that once you instantiate the prefabs in the ...
174 views

### Recognize pattern in 3D building environment

I'm currently developing 3rd person building game (as bacheleor thesis). I need to recognize constructed patterns co I can mark corresponding structure as some building (so player can start using that ...
968 views

### 3d Wall sliding collision

I'm working on collision for walls in my game and the way I currently have it I get stuck walking into a wall. I'm trying to make my character slide on the walls but still collide. My character moves ...
26 views

### Compute spheres 2D speeds in perspective projected animations

I created two animations that consist of spheres moving in a perspective projected 3D space, which means that the size and speed of the spheres vary with the distance: they increase when they are ...
217 views

### How do you find the collision between 3D boxes and 3D QUAD face meshes?

I have an axis aligned bounding boxes for 3D object collision, but I have a complex 3d mesh that's divided into 3d faces so I want to check for bounding boxes and collision with the faces of that ...
1k views

### Dual Contouring - what is it and how to use it?

I'm having trouble understanding Dual Contouring yet and I need some explanations from someone who has first hand experience. I searched all I could before writing this question. I've already read: ...
345 views

### 3D Zoom To Mouse Cursor accounting for Change in Camera Pitch

Overview: Simply put, I'm trying to make a zoom to cursor algorithm. This would normally be very simple, but the implementation of the camera is making it difficult. As the camera zooms in and out, ...
143 views

### Custom 3D Renderer: Frustum clipping

I have recently been toying with the idea of creating a 3D-renderer from scratch and, after looking into it, doesn't seem like such a behemoth of a task as it sounds. Last night, I was tossing and ...
374 views

### Cutting a 3D mesh with a 2D shape

I have a 2D image that i want to use to cut into a 3D mesh while leaving it closed (basically cut straight through it, and close it by generating vertices in both places it cut, front and back, to ...
212 views

### Texturing Objects in OpenGL

Using OpenGL tutorials found here, I constructed an .obj file loader as well as a texture file loader using SOIL. I have an issue with drawing a textured object. (Shown here) Assuming I created the ...
146 views

### Zoom to Mouse on a Globe using a Perspective Projection

I am trying to create a strategy game that takes place on a globe (i.e. a textured sphere). I would like to be able to zoom to mouse like on google maps. My camera always points towards the center of ...
114 views

### How would I warp a mesh with code?

I recently asked a question about putting a camera at the head of a 3D human model here and it worked out rather well and whatnot, but there is still a problem that bothers me: How would I contort/...
127 views

### UDK Modular construction (customisable vehicles etc)

I'd like to build an interface whereby the user can attach various components and blocks onto a vehicle, this is then saved (as object/coordinate, rotation, scale values - in database) and can be used ...
382 views

### How to create 3d picking ray with the cursor position

I'm new here and I'm not sure how to go about doing this. I am creating an application that is supposed to use the cursor's position in the window to perform 3d picking. The tutorials I have found ...
403 views

### How can I export a model using the CAT bone system into XNA?

Has anyone successfully used the CAT bone system in 3ds Max and exported the file into XNA? If so, what was your method of doing so? There are a number of methods of doing this, apparently, but the ...
368 views

### Combining skydome and fog

I am developing a 3D game in DarkBASIC Professional, and I have a theoretical problem with the combination of skydomes and fog in general. My question is not specific to a programming language, so I ...
368 views

### How to fix my camera collision, C# XNA

I am having some weird issues with my camera. I am trying to make it so it is a first person camera, that when the user presses the W or Up key, it moves towards where the camera is looking. My issue ...
645 views

### Computing the UV coordinates of a 3D point that lies within a 3D triangle

From a triangular mesh I have a 3D triangle T represented by 3D vertexes v0, v1 and v2. Each vertex has an associated UV coordinate into a common texture image, represented as uv0, uv1, uv2. ...
25 views

### Real-time 3D Scene-reconstruction into Physics Engine

I am trying to create a game where the user scans the room using RGBD camera and reconstructs 3D scene. This scene would be integrated into physics engine, after an object recognition algorithm tells ...
57 views

### How can I apply my camera to all graphics objects?

Is there a way to have the camera be applied to all objects? Can you have the camera effect objects that where made with glVertex3f(); This is the fourth time I ...
44 views

### How to have a point light with no falloff in Unity 3D?

Does anyone know of a good strategy to make point lights with no falloff, eg. anything in the radius of the light will be 100% illumination while anything outside the radius will be 0% illumination. ...
62 views

### Self-illumination vs luminance

I'm using a graphics format reading library which has an enum called "MaterialLuminanceMode". There are three luminance modes for materials available: Self-illumination, which I interpret to mean "...
68 views

### Model gets distorted when rotating the camera

I'm currently developing my own 3d graphics engine and I'm having a hard time figuring out why my 3D models gets distorted when rotating the camera around. This is my projection matrix. I'm following ...
27 views

### Monogame - How to correct “brightness-additivity” while using Alpha-Blend-State

When using GraphicsDevice.BlendState = BlendState.AlphaBlend; in monogame following happens: Is there any avaible method to keep the color brightness ...
57 views

### How should a 3D map be stored?

I have an array of 3d vertices, Vertex3D[][] ground; so for each element in the array, I have an array of three 3D vertices, a triangle. But this means I cannot ...
41 views

### How can I get my player's character to slide along a rail?

I am creating a snowboarding game and would like my player to be able to jump on a rail and move along it if it lands on it. I have no idea how to approach this. I have already tried using ray casts ...
573 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 ...
26 views

### Scene for Computer Screen

We are developing a scene that will involve heavily interacting with a "touch screen monitor" in the scene.. Because the workflow of the touch screen will need to be dynamic we are creating a REST API ...
31 views

### Discrete line inside a 3D matrix

First of all a little premise: I'm following this tutorial on YouTube for procedural 2d cave generation in unity using cellular automata and I'm extending it in order to make caves in all three ...
71 views

### Convert bones by bone matrix

I have a 3d-models from old game. They have the following structure: ...