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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Understanding unknown mesh data structure

I have a large number of old mesh files in a custom, undocumented binary format. I have managed to parse almost everything but am left with one group of structures, described below, that I don't ...
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1answer
366 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 ...
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177 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 ...
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667 views

How to convert an octree to a polygon mesh?

So if I have dynamic voxel terrain data stored in an octree representation what would be the best way to go about converting the octree to a polygon mesh which I can render with OpenGL? A lot of ...
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647 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 ...
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569 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 ...
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1answer
428 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 ...
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399 views

Swap limbs of a skinned mesh

If I have a model, such as a robot, I am able to swap its limb meshes out and replace them with other robot limb meshes by merely removing the limb mesh from the skeleton and attaching the new one to ...
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317 views

Vertex Normals, Loading Mesh Data

My test FBX mesh is a cube. From what I surmise, it seems that the cube is on the extreme end of this issue, but I believe that the same issue would be able to occur in any mesh: Each vertex has 3 ...
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1answer
256 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-...
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22 views

Generating a mesh from a set of generatively produced co-ordinates

Using Unity I've been producing sculptural forms that look like this. It's made of patterns of cubes that twist around each other using a flocking algorithm. I'm trying to get it into a 3D printable ...
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1answer
118 views

How to inflate and deflated an object?

I'm trying to find a way to make an object inflated/deflated in Unity, So I can change parameters via script and control a range of 0-100% inflation. I have seen that there is a way to get this exact ...
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37 views

Update to the ROAM Large Scale Mesh LOD Method

I'm looking to create very large planetary terrain meshes. The most efficient and researched methodology I've seen so far was the ROAM 2.0 Method. However, this was written and published in 2005. Does ...
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1answer
182 views

Optimizing 3D tile-based geometry

For my game, I have a tool that lets me quickly create map geometry. You can see a (albeit early version) demo of the tool here. The main problem with the tool is that even a semi-large map can EASILY ...
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34 views

How to make Procedual Context Sensitive Mesh Generation during Runtime

In the game that i am trying to make i essentially generate an infinitely generating maze that has no dead ends and each corridor is of the same width. i have successfully managed to create this ...
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1answer
306 views

Render order for 3D meshes

I want to highlight a certain item in an inventory. It is a 3D scene although it looks a bit 2D. That is confirmed. To do do that I have create a cube with a very small z scale (so that it looks like ...
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2answers
2k 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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269 views

How can I blend meshes together where they intersect?

In a lot of my scenes I have things like this: and this: All the places I've circled are places where a prefab overlaps with another one or with the terrain. Is there any way to make those lines ...
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240 views

Unity3D Mapping uv coords from quads with unique vertices directly to texture map

this is my first post in this stack exchange! I was wondering how I would go about mapping the texture of my tiles for my tilemap directly to the texture atlas. I generate the mesh with unique ...
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3answers
102 views

How to find and manipulate a line on a mesh?

In Unity I currently have a script that allows me to "grab" a vertex, move it, and then update the mesh accordingly. How would I grab a line (which is basically grabbing two vertices I think) and move ...
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87 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 ...
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208 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 ...
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75 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 ...
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440 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 ...
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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 ...
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687 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 ...
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618 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 ...
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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 ...
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123 views

Exact collision detection for high-detail deformable triangular meshes

What robust methods or approaches exist for exact collision detection involving high-detail, deformable geometry? The kind of mesh I am describing is a surface that is specified as a triangulated ...
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116 views

Broken UVs for Maya/Mudbox model

I have tried using the automatic mapping in Mudbox and Maya, neither worked sufficiently, I was still experiencing polygon overlap. I tried mapping separate limbs but I came to the same problem, this ...
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250 views

How to extract the texture from an image onto a mesh?

(preamble: I think this fits either here or SO with computer vision tag, I chose gamedev because I think you guys are probably really good with textures and meshes, but tell me if my decision was ...
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35 views

How to weld nearby mesh collider vertices together to erase seams in Unity?

I'm using Unity 2020.3.2f1 and I have a very commonly seen problem. I have a Spherecollider which I am using for a physics game, and geometry that uses ...
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25 views

How can I detect and hide faces inside an object when combining two or more meshes?

I am trying to make a game where the player can make vehicles out of parts. To apply proper physics to the vehicles, like drag and buoyancy, I would like to get the outer hull of the various parts ...
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2answers
36 views

how can I rotate a tetrahedron's vertices so that it's pointing straight up?

I am trying to render an Equilateral triangle in 3D, and I came across this answer: https://math.stackexchange.com/a/562895/15497 So based off of that, I made my vertex points: ...
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20 views

Blender->Unity Import Animation Failing by Overlapping Mesh Objects

I'm new to both Unity and Blender. I created this penguin 3d model, rigged it up and animated it in Blender and all looked good. When I imported it into Unity, I noticed that this idle animation did ...
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61 views

creating model mesh and face explosions on Panda3d and Blender

I'm quite new to Panda3d and Python (1 year) and I've been trying for longer than 4 months to find out how to create a simple mesh explosion in Panda3d. I've created lots of different explosions using ...
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2answers
76 views

Objects Imported from Blender to Unreal have really zoomed Materials

I've been learning how to use Blender for UE4. I just started figuring out how to define which sides should have materials on them. In particular, I wanted this building to have different materials ...
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122 views

Creating runtime mesh colliders for roads in Unreal Engine 4

I want to create several mesh colliders in game at runtime. By mesh colliders I mean "complex collision". The meshes are for curved roads. The roads will be rendered using hierarchichal instanced ...
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58 views

Performance in unity at runtime (mesh creation) vs (assets bundle loading)

I'd like to load a 3d model that contains several objects in real-time. I believe I have to two methods to do this: create an assets bundle that contains my model (all object) and loaded at runtime. ...
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1answer
185 views

How to apply saturn's ring texture in Unreal Engine 4?

I'm working on a "solar system" model project. And while trying to apply saturn's ring texture which is this one : it ended up looking like this: I'm new to UE4 and this branch in general. So I ...
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23 views

How to always draw a child mesh in front of its parent mesh

I need to display a gizmo-like mesh at runtime, and it must be always in front of its target mesh. How can I achieve that?
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48 views

How to align edge vertices of modular props snapped on a 2D grid?

For a project I am working on I create some 3D props in Blender that can be put together in a modular way on a 2D grid in Unity. In Unity I generate the grid contents using these props. Now given ...
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27 views

Switching between meshes vs Loading only specific mesh

I am currently developing an online multiplayer game on Unity. In the game, the character of each player will be assigned its mesh after the game receives parameters (their meshes' names) for each ...
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1answer
53 views

Flat shaded triangles using the ModelBuilder?

I decided to give the ModelBuilder a try but I cannot get rid of the smoothing of my terrain. So what I tried: Create each triangle individually with there own ...
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130 views

Unity 3D Model imported with offset Mesh

So I've edited up an image to help show the problem, since showing the game itself is not an option: When I imported my model, the model appears normally, however when I actually put it into the ...
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85 views

Hi,Dynamically modifying meshes in Unity3D

I'm working in Unity3D and I want to remove sections from a mesh at runtime similar to the idea of bombs removing sections of walls. In 3D modelling software this is a pretty standard Boolean ...
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59 views

Unity: how to mimic the lighting of a mesh as seen in the editor view

I have a camera which shows a "bird's eye view" of a procedurally generated mesh like so: Currently in the editor view (right), the terrain looks exactly as I would like it to. However, in game (left)...
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663 views

Algorithmically fracture a mesh in Unity3D?

I want to create a plugin which shatters/fractures meshes, so I can make every object destructible if I want to. Like in Unreal's built-in feature. My quick approach to this problem is randomly ...
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196 views

How can I get visually accurate collision normals with sphere collisions?

I'm solving simple 3D sphere collisions by checking the sphere for overlap with a mesh, finding the nearest point on that mesh's surface to the center of the sphere, and then resolving the collision ...
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42 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 ...