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Questions tagged [3d]

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

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3d characters on 2d background game suggestions [on hold]

First off, I am wanting to get back into making games, I have made a few for personal use in gamemaker but never finished them as school always got in the way or they would get deleted when my ...
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1answer
27 views

Displaying debug line in custom raytracer implementation

Not sure if I should post this here or on the Math forum, but I will try my luck. Some background. I made my custom raytracer. The processing happens purely on the CPU for now, no GPU interaction ...
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1answer
17 views

Face culling all faces that cannot be seen

I'm working on a simple 3d game using the Processing Java environment. I want to optimise my code so I can draw many many 'objects' (the world is made up of many different shaped objects that live ...
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25 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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1answer
38 views

What is the alternative (new) 3d projection called that solves the stretching / zooming at sides of monitor?

I understand about camera's and projections etc, such that we have distortion and zooming when at the sides of the screen (exacerbated on 21:9 monitors), however a few years ago, in a Unity forum ...
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35 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
66 views

How is background of 2.5d games developed

When I say 2.5d games, I mean like this: Bloodstained Ritual of the Night DEMO gameplay My question is, I know the characters and platforms are 3d but are the backgrounds all 3d as well? Even if its ...
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1answer
38 views

Making the camera look at the player while keeping another object in view

I'm working on a sorta football game where I need my player to always be at the center of the camera view while keeping the ball into view, without any vertical movement. The idea would be for the ...
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1answer
37 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
22 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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37 views

Why don't I see tile-based 3D graphics? [closed]

As we know, tiles can make it quicker to update large portions of the display at once, as compared with a bitmap. To put, say a letter, on the screen, the Commodore 64 typically does two writes (the ...
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2answers
153 views

Most efficient way to get the closest point to a 3d rectangle

I have a 3D rectangle, with 4 points (x,y,z) And I have a player, who can be anywere (inside the rectangle, outside, not even in the plane, in the corner...). I would like to get the closest point in ...
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1answer
33 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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4answers
48 views

How do I make TextMesh Pro go invisible when at a distance from the camera?

I'm building a 4x game. I've rendered the galaxy, and I want the text below each star to disappear when I'm zoomed out, so it looks nicer. My stars are Prefabs with a star sprite and a 'UI' ...
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2answers
44 views

Rotate on one axis, but visibly keep the other axes stable and editable

It's been a long two weeks. Quaternions are freaking complicated. I've managed to make a few baby steps towards finishing my project, but I've hit a brick wall and could use a few of your beautiful ...
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1answer
34 views

Z rotation matrix inverting object

I'm currently creating a 3d game where I need to rotate shapes. To do se, I created a rotation matrix for each axis, X, Y and Z. X and Y are giving me expected results, but not Z who kind of "inverts ...
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1answer
40 views

3d isometric projection matrix?

I have 3d vectors that I want to project as 2d vectors to draw my shapes. I got a 3d vector cameraPosition, a 3d vector cameraDirection, a float renderDistance. I need to create an orthogonal / ...
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1answer
19 views

Vertices in index buffer not rendered

I'm beginning with the 3D rendering in Monogame and i'm facing not a real issue because i already find a way to bypass it but more of a question. I'm rendering a simple cube with 8 vertices like that:...
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1answer
118 views

Dr.Strange's door in Unity3D, how to put a projected void on a plane?

My question is about a visual trick I would like to perform in Unity3D. I want the player to walk outside a door and see no walls of the room behind them, just the door. They should still be able to ...
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0answers
24 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 ...
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1answer
32 views

LineRenderer on Mesh surface

Goal: Render distance lines between two points on the surface of a mesh-based primitive (i.e. sphere, cube, etc). Current Solution: Iteratively traverse distance line between two end points and "...
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1answer
52 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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1answer
32 views

Unity, Object's vectors are not rotating with the object. what did i do wrong?

I found a youtube video (Sebastian Lague: Character Creation (E07: Unity character controller)) that has a really good movement script, I understood it and used it for my character. When I started ...
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21 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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1answer
70 views

Get a Jump normal gravity based on Attractor Points, lines or Quad placed in the Level Design (in a Mario galaxy like gravity)

I have an algorithme to find. I have a player in a 3D space on a random planet. My goal is to have an oriented gravity toward my planet. And when I jump: Find the right normal direction. BUT I can't ...
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1answer
40 views

how do I move an object based on rotation of another object?

This question is related to my other question about camera rotation. I hope its acceptable to ask a second question. I cannot figure out the math of how to calculate moving the camera to stay behind ...
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0answers
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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
76 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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0answers
25 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 ...
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1answer
17 views

Transfer mouse movements to a GameObject in 3D according to camera position and rotation

I'd like the game object to follow the mouse but I have trouble doing this when the object is in 3D and the camera has been rotated. The only thing that seems to be true (and still it works only when ...
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1answer
16 views

synchronise two coordinate planes

So i have two coordinate planes. One is player and mouse click position relative to player. Other is the world map. I need to find the point on the world map, where the mouse clicks. The map is ...
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1answer
47 views

How do I find the downward sliding direction of a plane?

first time poster. I'm curious as to how I can obtain a vector that defines the downward slope of a 3D plane. The goal is to apply this to a player as a force to achieve a sliding mechanic, like in ...
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1answer
73 views

C# 2D Perlin Noise Heightmap By Seed

I need a function of 'Perlin Noise' in this format: public int PerlinNoise_maxY(int seed, int x, int z) { // ... } The function gets Seed, X cordinent and a ...
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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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2answers
79 views

most compact way to represent dice face translations rolling in cardinal directions

I'm making a 2-D dice rolling game in BASIC (think mechanics similar to Devil Dice on the Playstation, but top-down 2D graphics). I'm trying to accurately represent the transitions of a die when ...
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1answer
25 views

Interpreting focal length in units of pixels

I am working on a renderer of sorts and I have some fundamental questions. Let's say I have a vector in a 3D virtual world space which is unitless, and I want to project it onto a 2D screen, so I need ...
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12 views

How can I prevent the balls from merging? [duplicate]

In my game mutiple balls are overlap/merge into one ball.please tell me solution of this problem.
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60 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
47 views

Scrolling in 3d Shmup with 32Bit era effects

How can I create a scrolling effect like in Ikaruga, where the background is on Rails and the foreground is fixed with the player in Unity? https://www.youtube.com/watch?v=H6d0PkEPKSk Some more ...
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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 ...
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1answer
35 views

unity input controls

so im going through the roll a ball tutorial for unity and ive gotten though setting up all the controls to allow my ball character to move around the space ive built. but the tutorial says nothing ...
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2answers
55 views

Find if one player is visible to the other

Two players (p1 and p2) are standing in a 3D space, represented by points (x1, y1, z1) and (x2, y2, z2). Player 2 is holding a light source, pointing in the direction given by a normalised vector (xn, ...
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0answers
40 views

Convert bones by bone matrix

I have a 3d-models from old game. They have the following structure: ...
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1answer
65 views

Polygons depth sorting in Z-buffer

Why is it that the Z-buffer algorithm does not require polygons to be depth sorted to function correctly?
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1answer
80 views

Unity: Creating Word Search highlighting

For days I am struggling to implement the highlighting functionality in game as there is not much tutorial also for this. I did how ever make the cell of the grid change the material color but it ...
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2answers
129 views

Game assets are images or 3D models

I am new to game development and I have created simple games with javascript and SFML. Those games are 2D and there I used images as my gaming assets. I was trying to be familiar with OpenGL like 3D ...
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1answer
347 views

Unity3D C# Drag object smoothly on it's x axis that's already bouncing

In my scene, I have a bouncing ball that collides with a cube. On each collision the ball returns to the same height. How can I get the ball to smoothly move along the x-axis by dragging my finger ...
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1answer
85 views

Why does the head of my ragdoll act like its about to fly off its shoulders?

The problem can be seen here: https://gfycat.com/LimpingMerryGermanshorthairedpointer Ive created my ragdolls by using the Unity ragdoll creator tool. To begin with, all the limbs of my ragdoll ...
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0answers
48 views

How to make backgrounds for 3D games? [closed]

I've started to study game design and I couldn't really find an answer for this one. Let's imagine a small level with a nice (non passable) background in the distance. The background has mountains, ...
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1answer
57 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 ...