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# Questions tagged [3d-meshes]

Geometric representations of objects in 3 dimensions. 3D-meshes are made up of a collection of triangles or other polygons, forming volumes and surfaces. They are commonly used for visual representations on computer screens.

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369 views

### Procedurally generated paths with intersections

The Problem I've been attempting to create some procedurally generated paths for a while now, but I've reached a problem when it comes to generating the intersections of the paths. The paths are ...
35 views

### 3D scanners that captures movement?

Could there be a 3D scanner that captures movement? One that scans, let us say, 30 times per second (for 30 fps) to make an animated 3D scene? Is this possible? Why? Suppose we want to scan a person ...
47 views

### How collision boxes are assigned to object in 3D games? [closed]

Level designers make levels and then programmers import the models and use it but How and when collision boxes are generated for objects and models in the 3D map placed at random locations? Thanks.
89 views

### How to procedurally create an extruded cube mesh's indicies?

I'm working on a tool that allows the user to create rails(basically an extruded cube) by placing 3d points where the vertices of rail would be. The picture below shows what I'm talking about. The ...
3k views

### 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 ...
573 views

### Triangulating a 3D mesh from a set of data points

I'm trying to implement the Bowyer-Watson point insertion version of the Delaunay triangulation algorithm, but in 3D. I previously implemented the 2D version without problems, but when transitioning ...
211 views

### How to fix a crowbar mesh deformation problem

I am having a problem exporting my model to Garry's Mod. Every time i compile the model in crowbar it comes out deformed like this when the model is really suppose to look like this how do I fix ...
725 views

### How to have multiple GameObjects sharing pieces of same material?

My question is: There's any way of having GameObjects sharing pieces of same Material, not a clone, but an extension of one? For example, in these case nine game objects sharing just the same material ...
63 views

### In Maya- how can I merge mulitple primitive cubes together into one parent item? (And is this actually needed for using in unity etc)?

Im trying to make some 3d models in Maya and then put them into Unity as characters which I can give rigidbody to etc. (Im new to Unity and 3d modelling software, but i have a small amount of ...
983 views

### Applying a face image to a mesh head

I'm playing around with 3D graphics programming and it's only a few weeks I'm into OpenGL and able to render meshes with textures with few basic transformations. I've a hobby project where I want to ...
1k views

### Should the level design be in Unity scenes (GameObjects) or in 3D programs (mesh) [closed]

I am wondering what is the most common and best way to design a game in Unity from the point of view of best practice and performance and the most easily maintainable? Is it really performant to ...
131 views

### D3D9CAPS gives unusual maximum shader instructions value

I'm trying to implement a vertex and pixel shader on a piece of hardware we're developing a game for which uses the DirectX 9.0c runtime. The shaders are for boned mesh animation and is a bit more ...
262 views

### How to create OpenGL models like the ones created by blender's wireframe modifier?

How could I create programatically wireframe models like this out of a triangular mesh? What'd be the algorithm behind? (Source) Creating an additional mesh using lines instead triangles or just ...
56 views

### What methods are there to discard points on one side of a surface but not the other?

Goal: Given a surface mesh (terrain), discard all points above a given elevation relative to the terrain. The terrain can change quite often due to tiling and LODs, so the point culling will need to ...
745 views

### Triangle mesh smoothing

I have a grid in terms of two arrays: points: contains 3D coordinates of points. triangles: contains 3 indices per line for ...
46 views

### Which approach to use when simulating a button press in a cockpit?

As the picture shows, I wish to press a button when I am flying the plane. I'm writing the program in DirectX 12 and C++, without a game engine. I am new to this, so I don't know which approach to use ...
134 views

### When to use LOD and when not to?

I have a simple question: are there any cases where game LOD models don't need to be created? Obviously you need LODs for landscapes, large props, characters, vehicles etc. But what about small indoor ...
2k views

### how to dent & deform damaged objects in unreal engine?

I am trying to simulate damages in cars using unreal engine when a body collides with it like it is done in this video - https://vimeo.com/162729920 I am trying to do it in the first person shooter ...
76 views

### Most efficient way to modify character mesh at run time

What is the most efficient way in unity to alter the mesh of a character in this scenario: When the player pick up an item: -A part of the mesh should be replaced, for example, the left arm is ...
43 views

### Project vertex on a line

V,A and B are 3 points in 3D space and We have d0 (distance of V from (AB)line). I want to calculate question mark point in the image above!
84 views

### Can I place 3D objects on a 2D sprite?

I am creating a circular island for my game. I will be doing it in Photoshop, and importing it to Unity as a .PNG. Will I be able to place grids and buildings on top of it, like in RTS games, or must ...
2k views

### How to calculate verticle normals of triangular mesh

I'm playing with some terrain generation. I have a triangular mesh that looks OK - that is if I hardcode verticles normals (on this image every single verticle has normal of (0,-1,0) The situation ...
631 views

### Load destructible mesh at runtime

Using the tutorial: Components and Collision as a guide, to dynamically load a SphereShape the following is done: ...
12k views

### Performance of manipulating a mesh in realtime

Does Unity allow streaming mesh data that can be continuously changed? I have a level that is dynamically changing based on some parameters. The number of triangles stays the same, they just change ...
447 views

### Generating 3D models / meshes

In LibGDX how can I construct a 3D terrain model that has Position Normal Color The model does not require a texture, it is colored on a per vertex basis. I've looked into LibGDX's ModelBuilder and ...
82 views

### Sticking things to Walls in 3D

I'm trying to leave the second dimension and finally make a 3d game, but I'm having a hard time coming up with a way to implement a certain concept. I am trying to make a flat object which would "...
82 views

### Unity Adding Box Colliders Changes Mesh dynamics

I have a bi-pedal mesh in unity. I'm adding box colliders to each bone in a mesh so the user is able to individually select each bone. However, when I add the colliders it changes the dynamics of the ...
747 views

### Determine “bounding box size” (not scale) of model in MonoGame

I'm working on integrating some the 3D models I import into my physics system by trying to take their "size" and use that as the side for objects within my physics system. When I say size, I'm ...
150 views

### How should I manage meshes for the streets of a 3D city map in Unity?

I was recreating a small city in Unity3D and was going to place streets and pathways according to a sketch. I'm building for Android and the city is quite small; I'm planning to have the entire road ...
58 views

### Swapping a mesh from MCS female to a custom mesh

I'm trying to swap a mesh from the MCS female CBJacket with a custom mesh that's supposed to be a lab coat. But it keeps turning in to a ball of spiky mesh! I made sure the avatar and armature for the ...
7k views

### Handmade Terrain vs. Terrain Engine in Unity?

I'm planning a game right now, to be made in Unity, and I'm trying to decide how I'll approach the basic level construction. Essentially, my game takes place on an island in an infinite ocean, very ...
692 views

### Libgdx - Building dynamic 3d models with Modelbuilder/MeshPartBuilder while rendering

Context: I'm building a mobile game targeted for android with libgdx. It's an endless highscore based game. The environment/terrain is build dynamically. It's kind of a maze/wall/block terrain. I'm ...
95 views

### Simulate dirt spread (Normal distribution?)

-This question is technically more math related, but it has to do with a simulation so I am here first. I can post this in the math SE instead if needed. I am in the process of trying out some mesh ...
2k views

### How to create an animation from several .obj files in maya?

I have several .obj files. I plan to create an animation from these .obj file. Every mesh in one .obj file is correspond to one frame. And every frame only show one .obj file (meshes in others .obj ...
1k views

### Why does my mesh disappear from certain angles?

I'm trying to construct a hexagonal prism from vertices for my turn-based strategy game. This is my first time working with meshes and I have been following this tutorial. The problem I am having is ...
178 views

### How do I find the face of an object?

I'm working on a build mode but the thing of it is the player is able to deform meshes. Part of my build system includes having "snap" points thus I need to be able to find the face and recenter the ...
1k views

### Draw the middle half of a sphere programmatically

I'm trying to create the middle half of a sphere. Basically to create a sphere, stack numbers and slice numbers are given, and there are two variables phi (for ...
13k views

### How to create Half hemisphere 3D model

I already have an hemisphere.obj 3D model. But I'm trying to build a half-hemisphere (quarter sphere) model. How can I do that? What is the easiest way to do that? ...
622 views

### Map video texture to a half sphere in Unity

I'm new to unity3D. and am trying to play a 360-degree video. But instead of mapping the whole 360-degree (equirectangular) video to the whole sphere, I need to map the half-video to a half-sphere ...
653 views

### Keeping a mesh entirely at the GPU and changing its vertices there with a ComputeShader (Unity5)

In a Unity game I have an object whose mesh is made of around 10k vertices and I have to make changes to these vertices (position, color, etc) almost every frame. Considering that such object is ...
233 views

### Point welding on generated terrain

I am converting two 2D images (A Voronoi graph and a Diamond Square noise map) into a 3D object. However when finding the corner points of the Voronoi I am left with gaps, so I thought to drop these ...
155 views

### How to prevent object from moving when it's mesh/collider is being updated?

So I a made a script that lets the player grab a vertex, move it, and then update the mesh. To help prevent the player from trying to clip it through other objects I made it so the mesh/collider is ...
259 views

### Rendering a distant star field in Unity using a separate camera for near stars

I'm currently working on a hobby project which is a universe simulator (exclusive to stars) built in unity3D. In order to deal with the raw scale of the universe I'm trying to implement two co-...
44 views

### How Would You Animate a 3d Characters Face (With Textures)

So I'd like to do a low poly style of modeling, and one of the corners I'd like to cut is on head geometry. Specifically, making the details of the face a texture (like a Mii or a character in Animal ...
845 views

### Calculating vertex normals to be able to have both sharp edges and smooth gradients

I'm computing area-weighted vertex normals, but lighting looks bad on meshes containing sharp edges and corners (e.g. cubes look 'blobby' as the light leaks onto the dark sides). Is there a way of ...
105 views

### Prevent player from jumping on a mesh

I am working on a game and I have a mesh that I use to block hallways and prevent the player from going that direction. They are placed vertically with slight angles. I'm having a problem that the ...
64 views

### Mesh/Path reduction to simulate traveled path to target

I generate that kind of mesh during runtime to display the path to follow to a target (think at something like the path your GPS shows you when you are travelling): I need to reduce the displayed ...
641 views

### Invisible mesh. Are my normals, normal?

I'm creating this mesh during runtime in Unity3D. The mesh shape is ok, but as you can see on this screenshot, the mesh is not correctly rendered: it's only rendered when the camera is looking back ...
3k views

### Smooth mesh from voxel grid

Im trying to implement smooth voxel grid meshing using marching cubes algorithm but I dont quite understand how to do the interpolating (I understand that this would solve the problem) to achieve the ...
278 views

### OpenGL EBO vs Mesh representation

As an exercise set to myself, I wanted to make a Mesh loader using modern OpenGL. However, I have to ways of representing the notion of face of a mesh. Currently, I am using what seems the most ...