# Questions tagged [3d]

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

1,639 questions
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### How to achieve single animation for different charcters?

I've been playing a game called Marvel Contesnt of Champions for android. In that game two opponent fights with each other in most 2D view but the game is developed in 3D. Each character has their own ...
701 views

### 3D objects with animated bones Monogame in the year 2017, is it possible?

I've been working on a game for quite some time now and suddenly it seems that I've hit the great wall of.. In the earlier XNA there were possibilities to use animation exported with the 3D object ....
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### How can I move a 3d object to a known Cartesian point on the surface of a sphere?

I'm trying to figure out how to move an object from one Cartesian point to another located on the surface of a 3D sphere. So that the object will follow the spherical coordinate system (Theta and Phi) ...
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### How to clamp the rotation between two values in unity 3d

How can i clamp the rotation of cube between two values and then rotate between them gradually Details Of what i Want When I press A or D keys cube should Rotate On Y Axis from 0 to 13 deg ...
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### Moving 3D object over Spherical terrain

I'm trying to control a 3D object (just a box for the moment) moving over a spherical 3D planet, I'm using a Ray to find the triangle in the sphere under the object. I'm calculating the surface normal ...
1k views

### Drawing a simple triangular prism in opengl in 3D

Is there a simple way to draw a triangular prism in opengl? I'm using lighting and a non-orthographic camera. I basically need a 3d object, not just vertices. edit: well I've tried searching, and I ...
383 views

### How can I blend grass decals in a transparent alpha channel in 3D? LibGDX

I'm new to 3D and trying to create grass simulation using decals in libGDX. I'm following the logic outlined here. Atm my grass decal is a billboard of grass stems with a transparent background. I'...
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### How to clip 3D object in projection (octants)?

In example we've wrote some code in Pascal (graph unit) which rotates 3D object in oblique frontal (dimetric) projection in all octants positioned in center of them. The projection's type: The code ...
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### 3D Player x positon problem

I`am make Runnig 3D game and i made to move left and right and when i move left or right i have problem with position X and rotation Y its change every frame, can someone help me to this direction. ...
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### My cube goes through side walls on android device

I have a cube and it's on the ground and there are two walls (Plane) next to the ground. Like in the image there is a ground and in side there is a wall. Here is my code: ...
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### 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 ...
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### How to move my cube left or right using touch Inputs (C#) in unity

I am trying to create a 3d game in unity. I have a cube in unity and I want it to move left or right on swipe . It should move to a distance till where user swipe or take their finger off of a screen. ...
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### 2d Scale width and height based on distance

I'm drawing a health bar on top of each player. I transform 3d position to 2d. I would like to draw it smaller when distance increases. Any simple math for that? Let's say bar width is 30 and height ...
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### Why are Monogame models tied to effects?

When I load a model in Monogame using ContentManager, the model contains effects on each mesh (mesh.Effects). This is confusing ...
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### LibGdx: Texturing cube results in jagged transparent edges

currently I'm in the works of programming a game - surprise xD I'm using LibGdx for this manner but I've encountered a very unknown bug I guess. I wasn't able to get any further by searching the ...
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### Poor performance with LWJGL VBO triangles

I'm new to OpenGL and LWJGL & I have a question about rendering using VBOs. I rendering 50*50 objects using VBOs. Each object has its own render method where binding of the position, rotation. ...
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### LibGDX: Draw a pie chart?

I'm new to LibGDX, my goal is to render a 3D pie chart, my idea is to draw a Cylinder and somehow define slices that can have different material and transformations. I can render a cylinder already ...
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### 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 ...
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### Any reason 3D character models aren't split into multiple models / files?

I'm just curious if there as any reason why artists are so resistant to split their 3D models into multiple fbx files. I just find the code design much cleaner if 3D models are split up into multiple ...
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### How to 'point' an arrow in the direction that it's going?

I am relatively new to OpenGL and 3D environments and am having trouble creating a rotation matrix that will rotate an arrow model so it 'points' in the direction that it is going. I am using GLM as a ...
280 views

### Is my 3d terrain moving?

I generate a 3d isometric terrain with the help of badlogicgames. I pass a perspective camera to the spriteBatch projectionMatrix, but when I move my player (perspective camera follows my player) it ...
179 views

### Shadow Shimmering When Moving Objects

I am having a shadow shimmering in my scene when using a shadow mapping technique. I know that there is a lot of posts over the internet dealing with this subject but my issue is slightly different. ...
204 views

### Lat, Lon and elevation Conversation into unity coordinates

I have came across a really vague project problem and its feasibility report or communication procedures I have to define. And here is the scenario: I have two applications One is built on Unity3d (...
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### AI not pathing correctly with pathfinding

I have implemented A* pathfinding to use in a game that im making for a project. The issue is that the AI that's using the pathfinding does not seem to wanna follow the path correctly. as displayed in ...
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### Quaternion Translation

I am writing a small game and I need some help with my quaternions. If I have an object at rotation A (quaternion) And I need it to be at rotation B (quaternion) in 10 steps how would I work out the ...
318 views

### Player movement vs world movement in infinite runner game?

Well I'm developing a Temple Run or Subway Surfer style infinite runner game. Which is more good? -Moving the player and make the Main Camera follow, or keep the player in one position and move the ...
104 views

### Moving spotlight (or object) between 2 coordinates (image included)

Given the origin position and direction for a spotlight. How can I smoothly move a spotlight between two 3D coordinates? Please use the picture below so I can easily comprehend this. I would like to ...
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### How to position a 3D crosshair on an objects face and set its angles **outward** from objects face?

What I have right now, is a ray tracer for my cursor on my canvas, when I click on the object, it gets the vector of my selection in the 3D space on the object I had my mouse on. The ray tracer ...
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### Fixed camera rotate to follow character

I have a camera in a fixed position in the middle of a field, and I would like to rotate the camera to follow the character as it moves around. There is no point lower than the camera, but I would ...
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### How to simulate camera turbulence for in-game cinematics [closed]

Are there any good algorithms for generating a convincing turbulence effect that can be applied to an in-game camera. For example, in use cases such as the viewpoint of a plane flying low and fast ...
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### Why Are These 3D Square's Pixels Spaced?

So i'm currently attempting to write a 3D renderer. From no prior knowledge because I want to challenge myself. But I'm stuck here, and thought I'd bring it to StackExchange because I always see ...
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### Setting collider in 3D map (blender file)

New to gamedev and I also have no idea about 3D files but, I'll try to explain the best I can. We are using our own custom engine built in C++ with OpenGL (glm, gl3w, glfw, entityx) We have a 3D map ...
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### Perspective View using Spritesheets

I am creating a Top-View 2D game. However, the only way i can get a good view of the objects, such as houses, trees, is to make the game in orthographic view. The same way games such as Pokemon games ...
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### Huge memory size with huge amount of voxels

I'm currently using a tridimensional grid for pathfinding, think of it as a huge cube with voxels (3d nodes) inside it, each voxel ita a class containing information about the voxel, if its an ...
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### Predicting the route a rigid body will take when force is applied

I'm learning 3D game development with some kind of mini golf game. It is working well so far: I have a sphere, and I am using AddForce on its ...
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### Oscillate an object's scale

I am able to scale an object using a scaling function I wrote. Internally it builds matrices that are multiplied by each of the vertices to transform them. The parameters I give the scaling function ...
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### 3d complex collision and trigger detection [closed]

I'm a Unity developer and I use monobehavior functions to dot things like collision detection. I have read about articles about collision detection. Most of them work with geometrical structures like ...
655 views

### Help to understand positive rotation direction on left/right handed cord spaces

I began to study 3D math and noticed about left/right handed cord spaces and clockwise/counterclockwise rules. I understand that left-handed use clockwise positive rotation and right-handed ...
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### In unity, some part of mesh doesn't show only in play mode

This is screenshot of not playing mode. You can see the the speedloader and bullets inside of the revolver. And this is when playing mode. As you can see, I can see the speedloader and bullets in ...
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### Why “polar angle” should be restricted to the range of [0,PI] when moving camera?

In the sample code d3d12book-master\Chapter 6 Drawing in Direct3D\Box\BoxApp.cpp of "Introduction to 3D Game Programming with DirectX12 : Frank D. Luna", the camera ...
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### How do you compute the tangent space vectors with normals given in the mesh?

Suppose you are given a mesh with normals for each vertex. These normals might not correspond to the face normals, as the artist could have tweaked them. In this case, how would you go about computing ...
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### Engine for 2.5D Voxel Based City Simulation [closed]

We're looking into making a game where you're part of a city and you're interacting with its economy and people. The world should be an open and procedurally generated sandbox to enable players to the ...
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### How does mouse input work in 3d games? [closed]

How does a game process cursor movements? I know it calculates offset from the middle of the screen, but how? What constraints is that cursor having? Is it locked to the middle of the screen/a ...
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### XNA Further faces are shown through closer faces

I'm trying to draw a 'axis' model named 'XYZ'. The problem is that it is rendered wrong (screenshot below). You can see that the blue face can be seen through the red face. The black, green and red ...
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### How to reset a libGDX PerspectiveCamera?

I'm having problems setting a PerspectiveCamera values when changing scenes. Let's say I set a PerspectiveCamera as follows for level 1 in a game: ...
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### Compute Corners of Cuboid In 3D

How can I compute the eight corners of a cuboid given a Depth and Height and two points: A(x,y,z) and B(x,y,z)? Is it possible to calculate the eight corners/points of a cuboid given only a limited ...
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### Model disappears when viewing from up vector

I'm sure there is a simple explanation for this behavior that makes mathematical good sense, but I need a way to look at my model along the up vector. I have tested it with the three unit vectors to ...
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### Algorithm for clipping convex quadrilaterals

I'm dealing with hardware that uses quads as its polygonal primitive. Not triangles. A triangle can be expressed by setting 2 of the 4 equal to each other for a degenerate quad. For the 3D engine, I'...